Effect of urea on the conformational behavior of poly(N-isopropylacrylamide)

被引：34

作者：

Fang, Y ^{[1
]}

Qiang, JC ^{[1
]}

Hu, DD ^{[1
]}

Wang, MZ ^{[1
]}

Cui, YL ^{[1
]}

机构：

[1] Shaanxi Normal Univ, Dept Chem, Polymer Lab, Xian 710062, Peoples R China

来源：

COLLOID AND POLYMER SCIENCE | 2001年 / 279卷 / 01期

关键词：

poly(N-isopropylacrylamide); urea; pyrene; fluorescence technique; conformation;

D O I：

10.1007/s003960000381

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effect of urea on the conformational behavior of poly(N-isopropylacryramide) (PNIPAM) in dilute aqueous solution has been investigated using fluorescence spectroscopy, fluorescence quenching and fluorescence anisotropy measurements via pyrene (Py) probe and acenaphthylene (ACE) label studies. It was demonstrated that urea promotes the partitioning of the hydrophobic probe, Py, towards the bulk aqueous phase at temperatures above the lower critical solution temperature (LCST) of the polymer due to swelling of the compact coil conformation. However, the compact coil structure of the polymer at temperatures greater than its LCST is not completely destroyed, even for urea concentrations up to 3 M, at which the phase transition is hardly observed. As expected, urea has little effect on the conformational behavior of PNIPAM at temperatures below its LCST.

引用

页码：14 / 21

页数：8

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