Synthesis of temperature-responsive heterobifunctional block copolymers of poly(ethylene glycol) and poly(N-isopropylacrylamide)

被引：96

作者：

You, Ye-Zi ^{[1
]}

Oupicky, David ^{[1
]}

机构：

[1] Wayne State Univ, Dept Pharmaceut Sci, Detroit, MI 48202 USA

来源：

BIOMACROMOLECULES | 2007年 / 8卷 / 01期

关键词：

D O I：

10.1021/bm060635b

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Heterobifunctional block copolymers of poly( ethylene glycol) ( PEG) and poly(N-isopropylacrylamide) ( PNIPAM) were synthesized by reversible addition-fragmentation chain transfer ( RAFT) polymerization of NIPAM using a macromolecular trithiocarbonate PEG-based chain transfer agent. The polymerization showed all the expected features of living radical polymerization and allowed the synthesis of copolymers with different lengths of the PNIPAM block. The synthesized block copolymers contained a carboxylic acid group from L-lysine at the focal point and a trithiocarbonate group at the terminus of the PNIPAM block. The trithiocarbonate functionality was converted into a thiol group and used for conjugation of biotin to the end of the PNIPAM block. The copolymers exhibited temperature-dependent association behavior in aqueous solution with a phase transition of approximately 32 degrees C. The described heterobifunctional block copolymers show promise for surface modifications with the potential for stimulus-controlled surface presentation of ligands attached to the terminus of the PNIPAM block.

引用

页码：98 / 105

页数：8

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