Overview
Methyl Polyoxyethylene (MPEG) is a polyether compound belonging to the family of polyethylene glycol derivatives. As a nonionic surfactant, it features a hydrophilic polyethylene oxide chain and a hydrophobic methyl end group. This amphiphilic structure makes it valuable in numerous industrial and consumer applications. The compound is produced through the polymerization of ethylene oxide initiated by methanol. The degree of polymerization (n value) can be controlled to produce materials with varying molecular weights and properties. MPEG is commercially available in molecular weights ranging from 350 to 5000 Daltons, with each grade having specific applications.
Physical and Chemical Properties
Methyl Polyoxyethylene exhibits typical polyether characteristics with excellent water solubility and thermal stability. The viscosity increases with molecular weight, ranging from mobile liquids to waxy solids. Its cloud point (the temperature at which it becomes insoluble in water) depends on the ethylene oxide chain length. Chemically, MPEG is relatively inert but can undergo typical ether reactions. It shows good compatibility with many organic compounds and demonstrates low volatility. The substance is non-flammable under normal conditions and has low acute toxicity, making it suitable for pharmaceutical and food-related applications.
Main Applications
In industrial applications, MPEG serves as an effective emulsifier and dispersant in polymer production, particularly in polyurethane manufacturing. It's also used as a plasticizer and viscosity modifier in various formulations. The pharmaceutical industry utilizes MPEG as an excipient in drug delivery systems and as a solubilizing agent. Personal care products frequently contain MPEG as an emollient and surfactant. Its mildness makes it suitable for shampoos, creams, and other cosmetic formulations. In agriculture, it functions as an adjuvant in pesticide formulations to improve spreading and penetration.
Safety and Storage
MPEG is generally considered safe with low toxicity, earning approvals from regulatory bodies for use in food and pharmaceutical applications. However, proper handling should include eye protection and gloves to prevent irritation from prolonged contact. Ingestion of large quantities may cause gastrointestinal discomfort. Storage recommendations include keeping containers tightly sealed in well-ventilated areas at temperatures below 40°C. Although stable under normal conditions, MPEG can oxidize over time when exposed to air, leading to the formation of peroxides in aged samples. Shelf life typically exceeds two years when stored properly.
B2B Procurement Guide
When procuring Methyl Polyoxyethylene, buyers should clearly specify the required molecular weight range, typically indicated by the average number of ethylene oxide units (e.g., MPEG-350, MPEG-2000). Purity requirements should be stated, especially for pharmaceutical or food-grade applications where heavy metal content and other impurities are strictly regulated. Suppliers usually offer technical and pharmaceutical grades, with price variations reflecting purity levels. Bulk purchases (drum quantities or larger) typically offer significant cost savings. Quality certifications such as USP, EP, or Kosher status should be verified when required for specific applications.
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