Overview
Polyoxyethylene (POE), also known as polyethylene glycol (PEG) or poly(ethylene oxide), is a polyether compound with widespread industrial and consumer applications. It is produced through the polymerization of ethylene oxide and is available in various molecular weights, ranging from liquids to solids. POE is valued for its water solubility, low toxicity, and versatility. The polymer's properties vary significantly with its molecular weight. Lower molecular weight POEs are liquid at room temperature, while higher molecular weight variants form waxy solids. This adaptability makes POE suitable for diverse applications across multiple industries, from pharmaceuticals to industrial manufacturing.
Physical and Chemical Properties
POE exhibits excellent water solubility due to its hydrophilic ethylene oxide units. The polymer is chemically stable under normal conditions but may degrade when exposed to strong acids or oxidizers. Its melting point increases with molecular weight, typically ranging from 60-65°C for common grades. A key characteristic of POE is its ability to form hydrogen bonds with water molecules, making it an effective humectant and solvent. The polymer also demonstrates good compatibility with many organic compounds, enabling its use as a solubilizer and stabilizer in formulations. Viscosity varies significantly with molecular weight, allowing for tailored solutions in different applications.
Main Applications
In pharmaceuticals, POE serves as an excipient in tablets, ointments, and suppositories due to its non-toxic nature and solubility properties. It's particularly valuable in controlled-release formulations. The cosmetic industry utilizes POE in creams, lotions, and shampoos for its moisturizing and thickening properties. Industrial applications include use as lubricants in metalworking and textile processing. POE's surfactant properties make it valuable in detergent formulations. Recent developments have explored its use in biomedical applications, including drug delivery systems and tissue engineering scaffolds, leveraging its biocompatibility and tunable properties.
Safety and Storage
POE is generally regarded as safe for most applications, with low acute toxicity. However, proper handling procedures should still be followed to minimize dust exposure, which may cause respiratory irritation. The material is not considered flammable but may decompose at high temperatures. For storage, POE should be kept in tightly sealed containers in a cool, dry environment away from direct sunlight. Moisture absorption can affect the material's properties, particularly for lower molecular weight grades. Long-term storage may require nitrogen blanketing for sensitive applications. Always consult the specific material safety data sheet (MSDS) for detailed handling instructions.
B2B Procurement Guide
When procuring POE, clearly specify the required molecular weight range, as this significantly affects performance. Common grades include PEG 200, 400, 600, 1000, 1500, 4000, 6000, and 8000, with numbers indicating approximate molecular weights. Purity requirements should be stated, especially for pharmaceutical or food-grade applications. Bulk purchases typically offer cost advantages, but consider storage capabilities. For specialized applications, discuss customization options with suppliers regarding molecular weight distribution or end-group modifications. Quality certifications (such as USP, EP, or JP for pharmaceutical grades) should be verified. Lead times may vary based on grade and quantity, particularly for less common molecular weights.
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