摘要
通过自由基聚合法合成了温度敏感聚N 异丙基丙烯酰胺 (PNIPAM )和苊烯(ACE )标记的聚N 异丙基丙烯酰胺 (PNIPAM /ACE) ,系统考察了外加盐对PNIPAM水溶液最低临界溶解温度 (LCST)的影响 .实验表明 ,随外加盐浓度的增加 ,PNIPAM水溶液的LCST降低 ,降低程度不仅与体系的离子强度有关 ,而且与外加盐的本性有关 .荧光各向异性研究表明盐的加入降低了PNIPAM链的柔性 ,从而使其相变温度降低 .
Poly(N isopropylacrylamide) (PNIPAM) and acenaphthylene (ACE) labeled PNIPAM (PNIPAM/ACE) have been synthesized by free radical method. The salt effect on the low critical solution temperature (LCST) of PNIPAM has been systematically investigated. It was found that the LCST decreases with increasing salt concentration and the effect is not only salt concentration and salt type dependent, but also salt nature dependent. Fluorescence anisotropy via ACE label studies revealed that addition of salt decreases the segmental mobility of the PNIPAM chain, and thereby decreases the LCST of the polymer.
出处
《陕西师大学报（自然科学版）》
CSCD
北大核心
2000年第3期84-89,共6页
Journal of Shaanxi Normal University(Natural Science Edition)
基金
国家自然科学基金资助项目!(2 99730 2 4 )
陕西省自然科学基金资助项目!(99H13)
