PEG-POE, PEG-POE-PEG, and POE-PEG-POE block copolymers have both hydrophilic and hydrophobic blocks. They form micelles in aqueous solution, making them suitable for encapsulation or solubilization of hydrophobic or water-insoluble materials; and they also form bioerodible matrices for the sustained release of active agents, especially when the POE block(s) contain at least one unit containing an &agr;-hydroxy acid.
P
EG-POE,P
EG-POE-P
EG和POE-P
EG-POE嵌段共聚物具有亲
水和疏
水区块。它们在
水溶液中形成胶束,适用于包封或溶解疏
水或不溶于
水的材料;它们还形成可
生物降解的基质,用于持续释放活性剂,特别是当POE区块中至少含有一个含有α-羟基酸的单元时。