摘要
为获得窄分布的聚（Ｎ－异丙基丙烯酰胺）（ＰＮＩＰＡ）试样，对在叔丁醇溶液中经自由基聚合得到的ＰＮＩＰＡ进行逐步沉淀分级（所用溶剂为丙酮，沉淀剂为正己烷或正庚烷），并用特性粘数、ＧＰＣ进行表征．随沉淀剂在溶液中的比例增大，沉淀出来的浓相级分的分子量逐步降低．所得各级分ＰＮＩＰＡ的分子量范围Ｍｗ为７×１０４～３３０×１０４，分子量分布指数Ｍｗ／Ｍｎ＝１．２～１．５．
Poly(N_isopropylacrylamide)(PNIPA) was radically synthesized in tert_butanol and fractionated by repeat precipitation to produce PNIPA samples with a narrow molecular weight distribution. The solvent used was acetone and the non_solvent hexane or heptane. Fractionated PNIPA was characterized with intrinsic viscosity and gel permeation chromatography. As the content of non_solvent in the solution increases the molecular weight of the PNIPA fraction in the precipitated phase decreases. Fractionated PNIPA samples have molecular weight of 7×104～330×104 and molecular weight distribution index Mw/Mn=1.2～1.5.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1998年第3期64-67,共4页
Journal of South China University of Technology(Natural Science Edition)
基金
国家教委"跨世纪优秀人才计划"基金
广东省"千百十工程"优秀人才培养基金
关键词
分级
表征
分子量分布
PNIPA
poly(N_isopropylacrylamide)
fractionation
characterization
molecular weight distribution
