聚乙二醇-嵌段-聚丙二醇-嵌段-聚乙二醇二丙烯酸酯

C₃H₃O[C₂H₄O]_x[C₃H₆O]_y[C₂H₄O]_zC₃H₃O₂

Poloxamers are nonionic, triblock copolymers containg a central hydrophobic chain of poly(propylene glycol) (PPG) and two terminal hydrophilic chains of poly(ethylene glycol) (PEG). Due to their amphiphilic structure, poloxamer solutions feature temperature dependent self-assembling and thermo-gelling behavior. Concentrated aqueous solutions of poloxamers are liquid at low temperature and form a gel at higher temperature, in a reversible process. This characteristic has allowed for these materials to be used as drug carriers for most routes of administration including oral, topical, intranasal, ocular, and parenteral. Acrylate-modified derivatives are most commonly used as thermosensitive hydrogels for drug delivery and 3D bioprinting applications. After casting or printing, the material can be crosslinked to preserve the hydrogel structure.

100

solid

average M_n ~5,800

off-white to yellow

−20℃

11 - Combustible Solids

WGK 3