Thermoresponsive micellization of poly(ethylene glycol)-b-poly(N-isopropylacrylamide) in water

被引：198
|
作者：
Zhang, WQ [1 ]
Shi, LQ [1 ]
Wu, K [1 ]
An, YG [1 ]
机构：
[1] Nankai Univ, N&T Joint Acad, Inst Polymer Chem, Key Lab Funct Polymer Mat, Tianjin 300071, Peoples R China
来源：
MACROMOLECULES | 2005年 / 38卷 / 13期
关键词：
D O I：
10.1021/ma0509199
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Thermoresponsive micellization of poly(ethylene glycol)-b-poly(N-isopropylacrylamide) (PEG(110)-b-PNIPAM(44)) in water is studied by static light scattering and dynamic light scattering. The critical aggregation temperature of PEG(110)-b-PNIPAM(44) is a little higher than homopolymer PNIPAM, and it depends on the block copolymer concentration, which increases from 33.7 to 38.4 degrees C when the copolymer concentration decreases from 2.0 to 0.20 mg/mL. Above the critical aggregation temperature, thermoresponsive micellization occurs, and the resultant spherical micelles consist of a PNIPAM core and a PEG shell. The block copolymer concentration exerts a strong influence on the size and structure of the resultant micelles. Micellization of PEG(110)-b-PNIPAM(44) at higher copolymer concentration favors formation of narrowly distributed, small, and dense micelles, while large, loose micelles or micellar clusters form at lower block copolymer concentration.
引用
收藏
页码：5743 / 5747
页数：5
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