Dynamic light scattering study of poly(N-isopropylacrylamide-co-acrylic acid) gels

被引：166

作者：

Shibayama, M

Fujikawa, Y

Nomura, S

机构：

[1] Dept. of Poly. Sci. and Engineering, Kyoto Institute of Technology, Sakyo-ku, Kyoto 606, Matsugasaki

来源：

MACROMOLECULES | 1996年 / 29卷 / 20期

关键词：

D O I：

10.1021/ma960320w

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Spatial inhomogeneities of poly(N-isopropylacrylamide-co-acrylic acid) (NIPA/AAc) gels were investigated by dynamic light scattering as a function of AAc comonomer concentration and temperature. The results showed the following: (1) The ensemble average scattered intensity, [I](E), decreased with increasing AAc comonomer concentration and increased with temperature. (2) Dynamic fluctuations increased with temperature and diverged at the transition temperature, T-c. (3) Above the Theta temperature of NIPA homopolymer in an aqueous solution, the intensity-intensity time correlation function did not fit a single-exponential function, but fit a double exponential or a stretched exponential, indicating a heterogeneous structure, i.e., polymer-rich and polymer-poor phases at temperatures above Theta.

引用

页码：6535 / 6540

页数：6

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