Overview
Hydroxyethyl is a functional group consisting of an ethyl chain (-CH2CH3) with a hydroxyl (-OH) substituent. It is not typically isolated but incorporated into larger molecules like hydroxyethyl cellulose or hydroxyethyl acrylate. The group enhances solubility and reactivity in organic and aqueous systems. Its versatility stems from the hydroxyl group's ability to form hydrogen bonds and participate in condensation reactions. This makes hydroxyethyl derivatives valuable in industries ranging from personal care to industrial coatings.
Physical and Chemical Properties
As a substituent, hydroxyethyl modifies the properties of parent compounds by increasing hydrophilicity. The hydroxyl group participates in hydrogen bonding, often lowering melting points and improving water solubility compared to unsubstituted analogs. In polymer chemistry, hydroxyethyl groups improve chain flexibility and reduce crystallinity. The group's reactivity allows for further functionalization through esterification or etherification, enabling tailored material properties for specific applications.
Main Applications
In pharmaceuticals, hydroxyethyl groups enhance drug solubility—seen in derivatives like hydroxyethyl starch (plasma volume expander). Cosmetic formulations use hydroxyethyl cellulose as a thickener and stabilizer due to its non-ionic nature and compatibility with electrolytes. Industrial applications include hydroxyethyl methacrylate (HEMA) for adhesives and coatings, where the group improves adhesion and crosslinking. The surfactant industry employs hydroxyethyl-containing compounds as mild, biodegradable alternatives to harsher ethoxylates.
Safety and Storage
Isolated hydroxyethyl radicals are unstable, but incorporated forms generally exhibit low toxicity. Derivatives like HEMA require caution due to potential skin sensitization. Always consult SDS for specific compounds. Store hydroxyethyl-containing products in sealed containers to prevent moisture absorption (for solids) or evaporation (for liquids). Incompatible with strong oxidizers. Shelf life varies by derivative—stabilized liquid monomers may require refrigeration, while polymers are typically stable at room temperature.
B2B Procurement Guide
Specify: (1) Purity/degree of substitution for polymers, (2) Solution concentration for liquids, and (3) Regulatory compliance (e.g., USP, EP for pharmaceuticals). Technical grades suffice for industrial uses. Suppliers often provide custom modifications—discuss substitution ratios, molecular weights, or co-monomer blends. For large-scale procurement, audit manufacturers for consistent quality control, especially for GMP applications. Spot prices vary by derivative; hydroxyethyl cellulose typically ranges $5–$15/kg depending on viscosity grade.
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