| 摘要 |
Disclosed is a multi-block copolymer comprising at least two ABA-type triblock copolymers which are covalently connected through a biodegradable dicarboxylic linkage, wherein A is a polyethyleneoxide block, B is a polypropyleneoxide block, a polybutyleneoxide block or a combination thereof, wherein said multi-block copolymer has an ionic group at both terminal ends, and wherein the ionic group is a member selected from the group consisting of monovalent or divalent metal salt of -SO3-, -PO32- , and -C(=O)-R-C(=O)-O-, wherein R is -(CH2)m- or an aryl having Cm', where m is an integer ranging from 0 to 20, and m' is an integer ranging from 6 to 12.
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