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Pluronic PE 9400 is a high-performance, non-ionic surfactant designed by BASF, belonging to the class of block copolymers.
This block copolymer consists of a central polypropylene glycol (PPG) block flanked by two polyethylene glycol (PEG) chains.
Thanks to its structure, Pluronic PE 9400 functions as a highly effective low-foaming agent, emulsifier, and dispersing assistant in various industrial formulations.
Pluronic PE 9400 is particularly valued for its ability to stabilize systems in hard water conditions and control foam during processing.
CAS Number: 9003-11-6
BASF Product Number (PRD): 30044106
Linear Formula: HO(C2H4O)x(C3H6O)y(C2H4O)xH
Molecular Structure: PEG15 - PPG46 - PEG15 (Approximate block distribution)
Molar Mass (Calculated from OH number): Approximately 4600 g/mol
Synonyms & Technical Identifiers
Oxirane, 2-methyl-, polymer with oxirane (Official regulatory identifier)
Ethylene oxide / Propylene oxide block copolymer
Poloxamer 284 (Common pharmaceutical and cosmetic nomenclature)
Poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide)
PEG-PPG-PEG Block Copolymer
Synthetic block copolymer of EO and PO
Low-foaming nonionic block copolymer surfactant
Defoaming agent / Foam depressant / Foam inhibitor
Wetting agent and dispersant
Technical Specifications and Chemical Identity
Chemical Name: Oxirane, methyl-, polymer with oxirane (Block Copolymer)
Alternative Names: PEG-PPG Block Copolymer, Poloxamer, EO-PO Block Copolymer
Physical Form (at 23 Degrees Celsius): White, waxy solid
Molar Mass (Calculated from OH number): Approximately 4600 g/mol
Active Concentration: Approximately 100 percent
Polyethylene Glycol (EO) Content: Approximately 40 percent
Density (at 23 Degrees Celsius): Approximately 1.03 g/cm3
Bulk Density: Approximately 600 g/l
Melting Point: Approximately 48 Degrees Celsius
pH Value (EN 1262, Solution B): Approximately 7 (Neutral)
Cloud Points (According to EN 1890):
Method A: Approximately 79 Degrees Celsius
Method B: Approximately 67 Degrees Celsius
Method C: Approximately 55 Degrees Celsius
Method D: Approximately 77 Degrees Celsius
Method E: Approximately 80 Degrees Celsius
Detailed Structural and Functional Overview
Molecular Design and Nomenclature
The Pluronic PE series utilizes a specific code system where the numbers reveal the molecular composition.
In Pluronic PE 9400, the first digit (9) indicates the molecular weight of the hydrophobic polypropylene glycol core on a scale of 1 to 10.
The second digit (4) represents the percentage of hydrophilic polyethylene glycol in the total molecule multiplied by 10, confirming that this product consists of 40 percent EO blocks.
This specific balance gives the substance its unique amphiphilic properties, making Pluronic PE 9400 an excellent bridge between water-based and oil-based phases.
Key Chemical Properties and Compatibility
As a non-ionic surfactant, Pluronic PE 9400 lacks an electrical charge in aqueous solutions.
This makes Pluronic PE 9400 highly compatible with anionic, cationic, and other non-ionic formulations.
Pluronic PE 9400 does not react with water-hardening cations like Calcium (Ca2+) or Magnesium (Mg2+), which ensures its performance remains consistent even in hard water environments.
Furthermore, Pluronic PE 9400 possesses an exceptional dispersing capacity for calcium and magnesium salts, preventing precipitation in industrial cleaning processes.
Solubility and Viscosity Behavior
Pluronic PE 9400 is highly hygroscopic and readily soluble in water.
Pluronic PE 9400 quickly absorbs ambient moisture, so Pluronic PE 9400 must be stored in tightly sealed containers.
When preparing aqueous solutions, Pluronic PE 9400 is highly recommended to stir the surfactant into the water rather than pouring water over the solid.
Reversing the mixing order can lead to a drastic increase in viscosity, as high molar mass block copolymers naturally form rigid gels at specific concentrations.
Industrial Applications
The product serves multiple specialized functions across diverse industries:
Emulsification: Pluronic PE 9400 acts as an excellent oil-in-water emulsifier, particularly for mineral oils and technical lubricants.
Dispersion: Pluronic PE 9400 assists in creating stable aqueous dispersions of solid particles, preventing agglomeration in plastics, rubbers, and emulsion polymerizations.
Defoaming and Surface Modification: Pluronic PE 9400 provides reliable foam suppression and alters surface tension to improve wetting in technical formulations, paper manufacturing, and packaging processes.
Handling, Storage, and Safety
The material should be stored in cool, dry areas inside its original packaging.
Storage tanks should be constructed from high-grade stainless steel (such as AISI 321 or AISI 316 Ti) to prevent degradation or contamination.
When processed in accordance with standard industrial practices, Pluronic PE 9400 does not present any known hazardous side effects or ill health risks.
Comprehensive Extended Technical Analysis
Thermodynamic and Phase Behavior
Pluronic PE 9400 exhibits distinct thermodynamic behaviors that vary significantly with temperature and concentration.
Because Pluronic PE 9400 is a block copolymer containing both hydrophilic (EO) and hydrophobic (PO) domains, its solubility in water decreases as the temperature rises.
This phenomenon leads to the characteristic cloud point behavior.
At temperatures below the cloud point, the hydrogen bonds between the water molecules and the ether oxygens of the PEG chains are strong enough to keep the copolymer dissolved.
When the temperature crosses the cloud point threshold, these hydrogen bonds break down, causing the polymer chains to dehydrate and self-assemble into complex micellar networks, which ultimately leads to phase separation.
Micellization and Critical Micelle Concentration (CMC)
In aqueous solutions, Pluronic PE 9400 undergoes self-assembly to form spherical micelles once Pluronic PE 9400 reaches its Critical Micelle Concentration (CMC).
The hydrophobic PPG segments gather inside the core of the micelle to minimize contact with water, while the hydrophilic PEG chains extend outward into the aqueous phase, forming a protective corona.
Unlike traditional low molecular weight surfactants, the CMC of Pluronic PE 9400 is strongly dependent on temperature.
As temperature increases, the hydrophobic nature of the PPG block becomes more pronounced, which drastically lowers the CMC value.
This characteristic allows engineers to trigger or control micellization dynamically by adjusting the process temperature.
Advanced Emulsification and Interfacial Rheology
When utilized as an emulsifier, Pluronic PE 9400 positions itself directly at the interface between the oil and water phases.
The PPG block dissolves in the oil phase, while the PEG blocks anchor themselves in the water phase.
This orientation lowers the interfacial tension, facilitating the breakdown of large droplets into smaller, stable micro-droplets.
Furthermore, the presence of the long polymer chains creates a strong steric hindrance barrier around the droplets.
This steric stabilization prevents coalescence and flocculation over extended periods, making Pluronic PE 9400 superior to ionic surfactants that rely solely on electrostatic repulsion, which can easily fail in highly saline environments.
Performance in Alkaline and Acidic Formulations
Due to its robust ether linkages, Pluronic PE 9400 demonstrates exceptional chemical stability across a broad pH spectrum.
Pluronic PE 9400 does not undergo hydrolysis when exposed to strong acids or high concentrations of alkalis.
This chemical resilience makes Pluronic PE 9400 an ideal additive for heavy-duty industrial cleaners, metal surface treatments, and CIP (Cleaning-in-Place) systems in food processing facilities where harsh chemical environments are common.
Rheological Modifying Capabilities
At elevated concentrations (typically above 20 to 30 percent by weight, depending on the temperature), Pluronic PE 9400 shifts from a low-viscosity liquid to a highly structured crystalline gel phase.
This transition is driven by the close packing of the micellar structures, which restricts the free movement of the polymer chains.
This thermoreversible gelation behavior is highly utilized in specialized coating processes, formulations requiring precise shear-thinning properties, and agricultural pesticide suspensions where the active ingredients must remain uniformly suspended without settling over long storage periods.
Environmental Degradation and Toxicological Profile
From an environmental perspective, Pluronic PE 9400 meets stringent regulatory standards for industrial use.
While block copolymers degrade more slowly than simple linear alcohol ethoxylates due to the high molecular weight of the PPG core, Pluronic PE 9400 undergoes gradual chain cleavage under environmental conditions.
Pluronic PE 9400 exhibits very low toxicity toward aquatic organisms, and because Pluronic PE 9400 is non-ionic and has low volatility, Pluronic PE 9400 does not contribute to volatile organic compound (VOC) emissions, aligning well with modern green chemistry guidelines.
