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4,4'-Methylenedianiline is a light brown crystalline solid with a faint amine odor.
4,4'-Methylenedianiline is very slightly soluble in water and soluble in alcohol, benzene,and ether.
4,4'-Methylenedianiline is combustible when exposed to heat or flame, when heated to decomposition，it emits toxic fumes of aniline and nitrogen oxides (NOx).
CAS Number: 101-77-9
Molecular Formula: C13H14N2
Molecular Weight: 198.26
EINECS Number: 202-974-4
Synonyms: 4,4'-Methylenedianiline, 101-77-9, 4,4'-DIAMINODIPHENYLMETHANE, Dadpm, Methylenedianiline, 4-[(4-aminophenyl)methyl]aniline, Bis(4-aminophenyl)methane, Dianilinemethane, Dianilinomethane, p,p'-Methylenedianiline, Epicure DDM, Epikure DDM, Curithane, 4-(4-Aminobenzyl)aniline, Benzenamine, 4,4'-methylenebis-, Jeffamine AP-20, p,p'-Diaminodiphenylmethane, Sumicure M, 4,4'-Diphenylmethanediamine, Ancamine TL, Bis(p-aminophenyl)methane, Di(4-aminophenyl)methane, Methylenebis(aniline), Bis-p-aminofenylmethan, 4,4'-Methylene dianiline, Di-(4-aminophenyl)methane, Araldite hardener 972, 4,4'-Methylenebis(benzeneamine), p,p'-Diaminodifenylmethan, 4,4'-Methylenebisaniline, 4,4'-Diaminodiphenylmethan, Avaldite HT 972, NCI-C54604, 4,4'-Methylenebis(aniline), HT 972, Bis(aminophenyl)methane, GG5LL7OBZC, 4,4'-Methylenedibenzenamine, Methylenebis[aniline], CHEBI:32506, alpha-(p-aminophenyl)-p-toluidine, NSC-4709, 4,4'-Methylenebis[aniline], 4,4-DIAMINODIPHENYLMETHANE, 4-((4-aminophenyl)methyl)aniline, 4,4'-MDA, RefChem:506839, para, para'-diaminodiphenyl-methane, 202-974-4, Tonox, 4,4-Methylenedianiline, Diaminodiphenylmethane, 4,4'-Methylenebisbenzenamine, Aniline, 4,4'-methylenedi-, 4,4'-Dimethylenediamine, Methylenedianiline (VAN), DTXSID6022422, 4,4'-Diaminobiphenyl methane, NSC 4709, 4,4'-Methylenedianiline-d8, 4,4'-Diaminodiphenylmethane (MDA), 4,4'-methanediyldianiline, 4,4'-methylene-dianiline, 4,4′-Diaminodiphenylmethane, 4,4'-Methylene(bisaniline), 4,4'-Diaminodiphenyl methane, 1219795-26-2, BIS-(4-AMINOPHENYL)METHANE, MFCD00007914, p-Toluidine, .alpha.-(p-aminophenyl)-, DTXCID402422, 4-[(4-aminophenyl)methyl]phenylamine, CAS-101-77-9, Bis-p-aminofenylmethan [Czech], CCRIS 1010, HSDB 2541, p,p'-Diaminodifenylmethan [Czech], UNII-GG5LL7OBZC, EINECS 202-974-4, p-Toluidine, alpha-(p-aminophenyl)-, UN2651, 4,4'-Diaminodiphenylmethane [German], BRN 0474706, AI3-02615, bis-p-aminophenylmethane, A1IHK, Aniline,4'-methylenedi-, p, p'-Methylenedianiline, di-(p-aminophenyl)methane, METHYLENEDIANILINE-, Epitope ID:116050, 4,4'-Methylenedi-Aniline, Di(para-aminophenyl)methane, EC 202-974-4, WLN: ZR D1R DZ, 4,4'-diaminobiphenylmethane, methylenebis(4-aminobenzene), Oprea1_406523, SCHEMBL28001, Benzenamine,4'-methylenebis-, MLS002303003, 4, 4'-Diphenylmethanediamine, 4-(4-Aminobenzyl)phenylamine, BIDD:ER0255, CHEMBL85728, Dianiline, 4,4'-methylene-, 4, 4'-Methylenebis(aniline), 4,4'-Methylenebis-Benzenamine, Bis-p-aminofenylmethan(CZECH), SCHEMBL2196895, SCHEMBL5253436, SCHEMBL6424853, 4,4-METHYLENEDIANILINE, Benzenamine,4-4'-methylenebis-, 4-(4-Aminobenzyl)phenylamine #, MSK1209, NSC4709, HMS3091M08, 4,4-DIPHENYLMETHANE DIAMINE, AAA10177, p, p'-Diaminodifenylmethan(CZECH), Tox21_201723, Tox21_300141, BBL022928, EBC-44125, SBB058722, STK988515, 4,4'-DIPHENYLMETHANE DIAMINE, 4, 4'-Diaminodiphenylmethan(GERMAN), AKOS000118778, MSK1209-1000M, CCG-103567, SDCCGMLS-0066191.P001, UN 2651, 4,4'-METHYLENEDIANILINE [HSDB], 4,4'-METHYLENEDIANILINE [IARC], NCGC00091159-01, NCGC00091159-02, NCGC00091159-03, NCGC00091159-04, NCGC00254163-01, NCGC00259272-01, P,P'-DIAMINODIPHENYLMETHANE [MI], AC-10921, MSK1209-1000, PD074403, SMR000019102, VS-07280, DB-058699, M0220, NS00003356, ST50406593, EN300-19463, 4,4'-Diaminodiphenylmethane, >=97.0% (GC), 4,4'-Diaminodiphenylmethane, analytical standard, 4-(4-Aminobenzyl)phenylamine (ACD/Name 4.0), Q229848, SR-01000394053, 4,4'-Diaminodiphenyl methane [UN2651] [Poison], SR-01000394053-1, F0921-0063, Z104473930, Bis-(4-aminophenyl)methane 100 microg/mL in Acetonitrile, 4,4'-Diaminodiphenylmethane Solution in Methanol, 1000ug/mL, 4,4'-Diaminodiphenylmethane Solution in Methanol, 1000ug/mL, 4,4'-Diaminodiphenylmethane, certified reference material, TraceCERT(R), InChI=1/C13H14N2/c14-12-5-1-10(2-6-12)9-11-3-7-13(15)8-4-11/h1-8H,9,14-15H, bis(p-aminophenyl)methane;ZERENEX ZX004995;P,P'-METHYLENEDIANILINE;4,4-Diaminodiphenylmethane~MDA;4，4′-Metylene dianiline;4,4'-Methylenebisbenzeneamine;4-(4-AMINOBENZYL)ANILINE;Bis-(4-aminophenyl)methane Solution, 100ppm
4,4'-Methylenedianiline is a crystalline solid that is soluble in water.
4,4'-Methylenedianiline is primarily used to produce 4,4-'methylenedianiline diisocyanate and other polymeric isocyanates which are used to manufacture polyurethane foams.
4,4'-Methylenedianiline is an industrial chemical that is not known to occur naturally.
4,4'-Methylenedianiline is also commonly known as diaminodiphenylmethane or MDA.
It occurs as a colorless to pale yellow solid and has a faint odor.
4,4'-Methylenedianiline is used mainly for making polyurethane foams, which have a variety of uses, such as insulating materials in mailing containers.
4,4'-Methylenedianiline is also used for making coating materials, glues, Spandex fiber, dyes, and rubber.
4,4'-Methylenedianiline is also a by-product of azo dyes. It is also possibly formed by hydrolysis of diphenylmethane-4A'-diisocyanate.
4,4′-Methylenedianiline is an aromatic diamine belonging to the diphenylmethane family.
It contains two aniline groups connected by a methylene bridge.
4,4'-Methylenedianiline is an important industrial intermediate, particularly in the production of polyurethane and epoxy materials.
4,4′-Methylenedianiline has the molecular formula C₁₃H₁₄N₂.
Its molecular weight is approximately 198.27 g/mol.
4,4'-Methylenedianiline CAS Registry Number is 101-77-9.
4,4′-Methylenedianiline is also known as 4,4′-diaminodiphenylmethane or MDA.
The abbreviation MDA is commonly used in chemical, polymer, toxicological, and regulatory literature.
It should not be confused with similarly abbreviated chemicals such as methylenedioxyamphetamine.
4,4′-Methylenedianiline contains two primary aromatic amine groups.
Each amino group is attached to a benzene ring.
The two benzene rings are connected through a central –CH₂– methylene bridge.
4,4′-Methylenedianiline is normally a crystalline solid.
Pure MDA is generally described as white to pale-yellow or yellowish in appearance.
4,4'-Methylenedianiline color can become darker as a result of impurities, oxidation, or prolonged storage.
4,4′-Methylenedianiline has a relatively high melting point.
The aromatic rings and intermolecular interactions contribute to its crystalline structure.
4,4'-Methylenedianiline melting behavior is useful for identification and purity assessment.
4,4′-Methylenedianiline has low volatility under ordinary conditions.
4,4'-Methylenedianiline does not readily evaporate like many low-molecular-weight organic solvents.
However, airborne exposure can still occur through dust, aerosols, or heated material.
4,4′-Methylenedianiline is a basic aromatic amine.
The amino groups can accept protons and participate in acid-base reactions.
4,4'-Methylenedianiline behavior also allows MDA to form salts with suitable acids.
4,4′-Methylenedianiline has limited water solubility.
4,4'-Methylenedianiline two aromatic rings contribute significant hydrophobic character.
The amino groups provide polarity, but they do not make the neutral compound highly water-soluble.
4,4′-Methylenedianiline can react with isocyanates.
The primary amino groups are highly reactive toward isocyanate functional groups.
This reaction is particularly important in the manufacture of polyurethane materials.
4,4′-Methylenedianiline is an important precursor to MDI.
MDA can be converted through phosgenation into 4,4′-methylenediphenyl diisocyanate (MDI).
MDI is one of the major industrial diisocyanates used for polyurethane production.
4,4′-Methylenedianiline is therefore an important intermediate in polyurethane chemistry.
4,4'-Methylenedianiline diamine structure provides the molecular framework needed to produce the corresponding diisocyanate.
The resulting MDI can then react with polyols to form polyurethane polymers.
4,4′-Methylenedianiline is also used in epoxy resin systems.
4,4'-Methylenedianiline two amino groups can react with epoxy functionalities and contribute to crosslink formation.
This can produce thermoset materials with high mechanical strength and thermal resistance.
4,4′-Methylenedianiline can function as an epoxy curing agent.
4,4'-Methylenedianiline primary amine groups react with epoxide rings through nucleophilic ring-opening reactions.
The resulting crosslinked network can provide strong adhesion and chemical resistance.
4,4′-Methylenedianiline can produce highly crosslinked polymer networks.
Each molecule contains two reactive amino groups capable of participating in curing reactions.
This multifunctionality makes it useful in thermosetting resin systems.
4,4′-Methylenedianiline is used in specialty polyurethane and epoxy materials.
These materials can be designed for applications requiring mechanical strength, dimensional stability, and resistance to elevated temperatures.
4,4'-Methylenedianiline use is particularly associated with high-performance polymer systems.
4,4′-Methylenedianiline can be detected using analytical techniques such as HPLC, GC-MS, FTIR, and NMR.
These methods can identify MDA and determine its concentration in chemical formulations or environmental samples.
Analytical detection is especially important because of its significant toxicological and regulatory relevance.
4,4′-Methylenedianiline is chemically related to other aromatic diamines.
4,4'-Methylenedianiline structure resembles compounds such as methylenedianiline isomers and other diphenylmethane-based diamines.
The position of the amino groups strongly influences the physical and chemical properties of each isomer.
4,4′-Methylenedianiline is an important intermediate in polymer and materials chemistry.
4,4'-Methylenedianiline two reactive amino groups allow it to participate in several industrial synthesis and curing processes.
However, its significant health hazards require strict controls during manufacture and handling.
4,4′-Methylenedianiline is considered a substance of significant toxicological concern.
It has been associated with serious effects on human health, particularly following sufficient exposure.
Consequently, its industrial use and handling are subject to stringent occupational and regulatory controls.
4,4′-Methylenedianiline is therefore best described as an aromatic diamine and industrial polymer intermediate.
4,4'-Methylenedianiline major chemical importance comes from its use in epoxy curing and as a precursor to MDI for polyurethane production.
Melting point: 89-91 °C (lit.)
Boiling point: 242 °C at 2 mm Hg (lit.)
Density: 1.15
Vapor pressure: 0 Pa at 25 °C
Refractive index: 1.5014 (estimate)
Flash point: 430 °F
Solubility: Soluble in water
pKa: 5.32±0.25 (Predicted)
Color: White to light yellow
Water solubility: Slightly soluble; <0.1 g/100 mL at 19 °C
Specific heat capacity: Cp(crystal): 1.37 J/(g·K) at 25 °C
Merck: 14,2980
BRN: 474706
Henry's Law Constant: 1.9×10⁵ mol/(m³Pa) at 25 °C, HSDB (2015)
Exposure limits: ACGIH: TWA 0.1 ppm (Skin); OSHA: STEL 100 ppb
InChI: InChI=1S/C13H14N2/c14-12-5-1-10(2-6-12)9-11-3-7-13(15)8-4-11/h1-8H,9,14-15H2
InChIKey: YBRVSVVVWCFQMG-UHFFFAOYSA-N
SMILES: Nc1ccc(Cc2ccc(N)cc2)cc1
LogP: 1.55 at 25 °C
4,4′-Methylenedianiline is a pale yellow crystalline solid (turns light brown on contact with air) with a faint amine-like odor that is unstable in the presence of light or air and emits toxic fumes of aniline and nitrogen oxides when heated to decomposition.
4,4′-Methylenedianiline is primarily used in industry as a chemical intermediate in the production of 4,4-methylenedianiline diisocyanates and polyisocyanates, but is also used as a cross-linking agent for the determination of tungsten and sulfates, and as a corrosion inhibitor.
Exposure to this substance irritates the skin and eyes and causes liver damage.
4,4'-Methylenedianiline is reasonably anticipated to be a human carcinogen. (NCI05)
4,4′-Methylenedianiline has a symmetrical molecular structure.
The two benzene rings are connected through a central methylene group, and each ring carries an amino group at the para position.
This symmetry contributes to its relatively regular crystalline structure.
4,4′-Methylenedianiline contains two primary amine functionalities.
Each –NH₂ group can participate in nucleophilic reactions with electrophilic functional groups.
These reactive sites are responsible for much of MDA's importance in polymer chemistry.
4,4′-Methylenedianiline can undergo nucleophilic addition reactions with epoxides.
The amine nitrogen attacks the electrophilic carbon of an epoxide ring and opens the three-membered ring.
Repeated reactions create a crosslinked thermoset network when multifunctional epoxy resins are present.
4,4′-Methylenedianiline is used as an aromatic amine curing agent for epoxy resins.
4,4′-Methylenedianiline rigid aromatic structure can contribute to high glass-transition temperatures and good thermal stability in cured materials.
These characteristics make MDA-based curing systems relevant to demanding engineering applications.
4,4′-Methylenedianiline can produce highly rigid epoxy networks.
The aromatic rings restrict molecular mobility within the cured polymer.
As a result, cured systems can exhibit high modulus and good dimensional stability.
4,4′-Methylenedianiline can contribute to the thermal resistance of cured epoxy materials.
Aromatic structures generally provide greater resistance to thermal motion than flexible aliphatic structures.
The final thermal performance nevertheless depends on the resin, curing ratio, and curing conditions.
4,4′-Methylenedianiline can contribute to chemical resistance in thermoset materials.
The crosslinked network formed during curing limits the mobility of polymer chains and reduces dissolution.
This property can be useful in protective coatings, adhesives, and engineering composites.
4,4′-Methylenedianiline can be used in high-performance composite materials.
MDA-based epoxy systems can bind reinforcing fibers such as carbon fiber, glass fiber, and other reinforcement materials.
The resulting composites can combine high stiffness with relatively low weight.
4,4′-Methylenedianiline has been associated with aerospace and advanced-composite research.
Aromatic amine-cured epoxy systems have been investigated for applications requiring high thermal and mechanical performance.
Specific commercial applications depend on the formulation and regulatory requirements.
4,4′-Methylenedianiline can be used in structural adhesives.
Its reaction with epoxy groups produces strong crosslinked adhesive networks.
These systems can provide high bond strength and resistance to thermal and mechanical stresses.
4,4′-Methylenedianiline can be used in protective coatings.
Epoxy systems cured with aromatic diamines can produce hard and chemically resistant surfaces.
Such coatings can protect substrates against mechanical wear and selected chemical environments.
4,4′-Methylenedianiline can be used in electrical and electronic materials research.
4,4′-Methylenedianiline cured epoxy networks can provide electrical insulation together with thermal and mechanical stability.
This makes aromatic diamine-cured epoxies relevant to encapsulation and insulation technologies.
4,4′-Methylenedianiline can participate in reactions with acid chlorides and related electrophiles.
The amino groups act as nucleophiles and can form amide-type products.
This chemistry provides additional synthetic routes to derivatives of MDA.
4,4′-Methylenedianiline can form salts with mineral and organic acids.
Protonation of the amino groups produces ionic forms with different solubility characteristics.
Salt formation can therefore be used in chemical processing and analytical identification.
4,4′-Methylenedianiline can undergo oxidation.
Aromatic amines can form oxidized products under suitable chemical or environmental conditions.
Oxidation can contribute to discoloration and changes in the chemical composition of stored material.
4,4′-Methylenedianiline can darken during prolonged exposure to air or unsuitable storage conditions.
Oxidation and impurities can change the appearance of the originally pale material.
Color change can therefore be an indication of chemical alteration, although it does not by itself establish degradation.
4,4′-Methylenedianiline has low vapor pressure at ambient temperature.
This limits evaporation under ordinary handling conditions.
However, dust, contaminated surfaces, and aerosols can still provide significant exposure pathways.
4,4′-Methylenedianiline can generate dust when handled as a solid.
Weighing, pouring, grinding, or mechanical transfer can release particles into the workplace atmosphere.
Closed handling systems and local exhaust ventilation can reduce this exposure.
4,4′-Methylenedianiline can be absorbed through the skin.
Dermal exposure is therefore an important consideration in occupational settings.
Preventing skin contact is particularly important because simply avoiding inhalation does not eliminate exposure.
4,4′-Methylenedianiline can be absorbed through contaminated clothing or gloves.
Material remaining on protective equipment can maintain contact with the skin for extended periods.
Contaminated protective clothing should therefore be removed and managed according to workplace procedures.
4,4′-Methylenedianiline can be present as a residual substance in polyurethane-related materials.
4,4′-Methylenedianiline can occur when manufacturing processes produce or contain MDA as an intermediate or degradation product.
Analytical monitoring may therefore be required for certain materials and production environments.
4,4′-Methylenedianiline can be generated from some MDI-based polyurethane materials under specific conditions.
Hydrolysis or degradation of certain polyurethane structures can release aromatic diamine species.
This is relevant to studies of chemical migration and degradation of polyurethane products.
4,4′-Methylenedianiline is important in polyurethane degradation research.
Researchers investigate whether MDI-based polymers can release MDA during exposure to moisture, heat, or other environmental conditions.
Such studies help evaluate the long-term chemical behavior of polyurethane materials.
4,4′-Methylenedianiline can be analyzed in environmental water samples.
Sensitive chromatographic methods can detect low concentrations following appropriate sample preparation.
Environmental analysis is useful because aromatic amines can enter water through industrial releases or material degradation.
4,4′-Methylenedianiline can be analyzed in biological samples.
Specialized analytical methods can detect MDA or biomarkers associated with exposure.
Such testing is mainly used in occupational hygiene, toxicology, and research settings.
4,4′-Methylenedianiline can be quantified by high-performance liquid chromatography.
HPLC coupled with suitable detectors or mass spectrometry provides sensitive identification and quantification.
This approach is widely useful for complex industrial and environmental matrices.
4,4′-Methylenedianiline can be characterized by infrared spectroscopy.
Its spectrum contains characteristic absorptions associated with aromatic C–H, C–C, and amine functionalities.
FTIR can therefore support identification of the compound and comparison with reference materials.
4,4′-Methylenedianiline can be characterized by nuclear magnetic resonance spectroscopy.
¹H NMR can distinguish the aromatic protons, methylene bridge, and amino-group-associated signals.
NMR provides detailed structural confirmation when sufficiently pure samples are available.
4,4′-Methylenedianiline is relevant to polymer recycling research.
Chemical recycling of MDI-based polyurethane materials can potentially generate MDA-containing streams.
Understanding these streams is important for developing safe recovery, purification, and reuse processes.
4,4′-Methylenedianiline is relevant to chemical recycling of polyurethane.
Processes such as hydrolysis, aminolysis, and other chemical treatments can break polyurethane bonds and generate aromatic amine products.
MDA can therefore be both a target recovery product and a compound requiring careful management.
4,4′-Methylenedianiline is relevant to occupational exposure monitoring in polyurethane production.
Workers may encounter it during manufacturing, processing, recycling, or maintenance activities involving MDI-based materials.
Exposure control requires consideration of inhalation as well as dermal absorption.
4,4′-Methylenedianiline has important regulatory significance.
Its toxicological profile has resulted in restrictions and stringent controls in various applications and jurisdictions.
The regulatory status should always be checked for the specific country, concentration, product category, and intended use.
4,4′-Methylenedianiline is therefore an important but highly controlled industrial chemical.
4,4′-Methylenedianiline aromatic diamine structure gives it valuable reactivity for epoxy curing and polyurethane chemistry.
Uses:
4,4'-Methylenedianiline is used in the production of polyurethane foams and epoxy resins. Potential contributor in pulmonary arterial hypertension (PAH) in rats through alteration of the serotenergic transport system.
Drinking water contaminant candidate list 3 (CCL 3) compound as per United States Environmental Protection Agency (EPA), environmental, and food contaminants. Dyes and metabolites, Environmental Testing.
4,4'-methylenedianiline be used as organic intermediates.
Mainly used for the synthesis of polyimide and as curing agent of epoxy resin.
4,4'-Diaminodiphenyl-methane is used in the determination of tungsten and sulfates; in the preparation of azo dyes; cross-linking agent for epoxy resins; in the preparation of isocyanates and polyisocyanates; in the rubber industry as a curative for neoprene, as an anti-frosting agent (antioxidant) in footwear; raw material in preparation of poly(amide-imide) resins (used in magnet-wire enamels); curing agent for epoxy res ins and urethane elastomers; corrosion inhibitor; rubber additive (accelerator, antidegradant, retarder) in tires and heavy rubber products; in adhesives and glues, laminates, paints and inks, PVC products, handbags, eyeglass frames, plastic jewelry, electric encapsulators, surface coatings, spandex clothing, hairnets, eyelash curlers, earphones, balls, shoe soles, face masks.
4,4′-Methylenedianiline is used primarily as an intermediate in the production of methylene diphenyl diisocyanate (MDI).
MDA is reacted with phosgene to produce MDI, an important industrial diisocyanate.
MDI is subsequently used to manufacture a wide range of polyurethane materials.
4,4′-Methylenedianiline is used in polyurethane production through its conversion to MDI.
MDI reacts with polyols to form polyurethane polymers with different structures and properties.
These materials are used in foams, elastomers, coatings, adhesives, and insulation.
4,4′-Methylenedianiline is used as an epoxy resin curing agent.
4,4′-Methylenedianiline two primary amine groups react with epoxide groups and form a three-dimensional crosslinked network.
The resulting thermoset can provide high strength, thermal resistance, and dimensional stability.
4,4′-Methylenedianiline is used in high-temperature epoxy systems.
4,4′-Methylenedianiline aromatic structure contributes to the thermal stability and rigidity of cured epoxy networks.
These characteristics make MDA-based curing systems useful for demanding engineering applications.
4,4′-Methylenedianiline is used in structural adhesive formulations.
When combined with suitable epoxy resins, it can produce strongly crosslinked adhesive systems.
These systems can provide high bond strength and resistance to mechanical and thermal stresses.
4,4′-Methylenedianiline is used in protective epoxy coatings.
MDA-cured epoxy systems can produce hard, durable, and chemically resistant coating layers.
Such materials can be investigated for protection of metals and other engineering substrates.
4,4′-Methylenedianiline is used in fiber-reinforced composite materials.
MDA-based epoxy resins can act as matrices or binders for reinforcing fibers such as carbon fiber and glass fiber.
The resulting composites can provide high stiffness, strength, and dimensional stability.
4,4′-Methylenedianiline is used in advanced composite research.
Aromatic diamine-cured epoxy systems have been investigated for applications requiring high mechanical and thermal performance.
This includes research related to aerospace, transportation, and high-performance structural materials.
4,4′-Methylenedianiline is used in electrical insulation materials.
Cured epoxy systems containing aromatic diamines can provide electrical insulation together with good thermal stability.
They can therefore be studied for encapsulation, insulation, and electronic-material applications.
4,4′-Methylenedianiline is used in electronic encapsulation research.
4,4′-Methylenedianiline epoxy-cured networks can provide rigid protective matrices around sensitive components.
The material properties can be adjusted through resin composition, curing temperature, and stoichiometry.
4,4′-Methylenedianiline is used in thermosetting resin research.
Its bifunctional amine structure makes it useful for investigating crosslinking reactions and network formation.
Researchers can study how curing conditions affect glass-transition temperature, modulus, and thermal stability.
4,4′-Methylenedianiline is used as a model aromatic diamine in polymer research.
4,4′-Methylenedianiline well-defined structure makes it useful for studying amine-epoxy reaction mechanisms.
It is also used to compare the performance of different aromatic and aliphatic curing agents.
4,4′-Methylenedianiline is used in polyurethane chemistry research.
Researchers can study its conversion to MDI and the subsequent formation of polyurethane materials.
This provides an important route for investigating aromatic isocyanate chemistry.
4,4′-Methylenedianiline is used in polyurethane recycling research.
Chemical recycling processes can break MDI-based polyurethane networks and potentially recover MDA-containing products.
Recovered aromatic diamines can then be investigated for purification and reuse.
4,4′-Methylenedianiline is used in chemical recycling studies of polyurethane foams.
Processes such as hydrolysis, aminolysis, and related chemical treatments can produce MDA from suitable polyurethane materials.
This makes MDA relevant to efforts aimed at recovering valuable chemical building blocks from polymer waste.
4,4′-Methylenedianiline is used in analytical chemistry as a reference compound.
4,4′-Methylenedianiline can be used to identify and quantify MDA in industrial materials, environmental samples, and chemical extracts.
Chromatographic methods are commonly employed for sensitive determination.
4,4′-Methylenedianiline is used in environmental monitoring.
Analytical laboratories can measure MDA in water, soil, sediments, and other environmental matrices.
Such measurements help investigate industrial contamination and the degradation of polyurethane-related materials.
4,4′-Methylenedianiline is used in occupational exposure monitoring.
MDA can be measured in workplace air, surface samples, or biological specimens where exposure is suspected.
These measurements help evaluate whether engineering and personal protective controls are effective.
4,4′-Methylenedianiline is used in toxicological research.
Its established toxicological profile makes it a subject of studies investigating aromatic amine exposure and biological effects.
Such research contributes to occupational and environmental risk assessment.
4,4′-Methylenedianiline is used in studies of polyurethane degradation.
Researchers investigate whether MDA can be released from MDI-based polymers during hydrolysis, aging, or other degradation processes.
This information is important for assessing the chemical stability of polyurethane materials.
4,4′-Methylenedianiline is used in studies of chemical migration from polymers.
Researchers can investigate whether residual or degradation-derived MDA migrates from polymeric materials into surrounding media.
These studies are particularly relevant when evaluating long-term material safety.
4,4′-Methylenedianiline is used in laboratory studies of epoxy curing kinetics.
Its reaction with epoxy groups can be monitored at different temperatures and stoichiometric ratios.
The resulting data help characterize reaction rates, conversion, and network development.
4,4′-Methylenedianiline is used to produce high-glass-transition-temperature epoxy materials.
The rigid aromatic structure of the cured network can restrict polymer-chain mobility.
This can result in thermosets with relatively high thermal resistance compared with many flexible curing systems.
4,4′-Methylenedianiline is used in research on high-performance thermosets.
4,4′-Methylenedianiline ability to generate rigid crosslinked networks makes it useful for studying materials designed for demanding mechanical environments.
Researchers evaluate properties such as modulus, fracture behavior, thermal stability, and chemical resistance.
4,4′-Methylenedianiline is used in specialty polymer development rather than general-purpose consumer formulations.
Its technical value comes mainly from its strong reactivity and ability to form high-performance networks.
However, its significant health hazards limit applications where safer alternative curing agents are available.
4,4′-Methylenedianiline is used as a chemical building block rather than primarily as a final product.
Its most important industrial role is as a precursor to MDI and as a reactive component in epoxy systems.
4,4′-Methylenedianiline use is therefore concentrated in specialized polymer, materials, analytical, and recycling applications.
Safety Profile:
Confirmed carcinogen with experimental tumorigenic data.
Human poison by ingestion.
Poison by subcutaneous and intraperitoneal routes.
Human systemic effects by ingestion: rigidity, jaundice, other liver changes.
An eye irritant. Mutation data reported.
4,4′-Methylenedianiline is not rapidly absorbed through the skin.
4,4′-Methylenedianiline is a substance of significant toxicological concern.
It can cause serious adverse health effects following sufficient exposure.
4,4′-Methylenedianiline handling therefore requires substantially more stringent precautions than those used for low-hazard laboratory chemicals.
4,4′-Methylenedianiline is classified as a carcinogenic substance in several regulatory frameworks.
Long-term or repeated exposure is associated with an increased concern for cancer development.
Occupational exposure should therefore be minimized as far as technically possible.
4,4′-Methylenedianiline can cause genetic damage under certain exposure conditions.
Genotoxicity has been an important component of its toxicological assessment.
This is one reason why unnecessary exposure should be strictly avoided.
4,4′-Methylenedianiline can cause serious damage to internal organs following repeated exposure.
The liver is particularly important in its toxicological profile.
Repeated occupational exposure can therefore represent a significant health concern.
4,4′-Methylenedianiline can cause liver toxicity.
The compound undergoes metabolic processing that can produce biologically reactive intermediates.
This can contribute to hepatic injury following sufficiently high or repeated exposure.
4,4′-Methylenedianiline can cause skin irritation and sensitization.
Direct or repeated skin contact may produce irritation and can contribute to allergic responses in susceptible individuals.
Preventing skin contact is therefore an important part of exposure control.
4,4′-Methylenedianiline can be absorbed through the skin.
Dermal absorption is an important exposure route because the compound does not need to be inhaled to enter the body.
Chemical-resistant gloves and protective clothing should therefore be used during handling.
