A New Family of Thermo-Responsive Polymers Based on Poly[N-(4-vinylbenzyl)-N,N-dialkylamine]

被引：71

作者：

Dan, Meihan ^{[1
]}

Su, Yang ^{[1
]}

Xiao, Xin ^{[1
]}

Li, Shentong ^{[1
]}

Zhang, Wangqing ^{[1
]}

机构：

[1] Nankai Univ, Inst Polymer Chem, Minist Educ, Key Lab Funct Polymer Mat, Tianjin 300071, Peoples R China

来源：

MACROMOLECULES | 2013年 / 46卷 / 08期

基金：

美国国家科学基金会;

关键词：

CONTROLLED RADICAL COPOLYMERIZATION; MACRO-RAFT AGENT; AQUEOUS-SOLUTIONS; BLOCK-COPOLYMERS; N-ISOPROPYLACRYLAMIDE; PHASE-TRANSITION; DIBLOCK COPOLYMER; UCST TRANSITIONS; TUNABLE LCST; PEG-ANALOGS;

D O I：

10.1021/ma4002116

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A new family of the thermo-responsive polymers based on poly[N-(4-vinylbenzyl)-N,N-dialkylamine] with the pendent amine group as well as the doubly thermo-responsive triblock copolymer were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization. These polymers showed the lower critical solution temperature (LCST) and/or the upper critical solution temperature (UCST) in alcohol and in the alcohol/water mixture. The polymer molecular weight, the polymer concentration, the cosolvent/nonsolvent and the deuterated solvent affecting the LCST and/or UCST were investigated, and their great influence on the LCST/UCST was demonstrated. The origin of the phase transition of poly[N-(4-vinylbenzyl)-N,N-dialkylamine] at LCST upon heating was investigated and the possible reason was proposed. The doubly thermo-responsive triblock copolymer of PVMA(53)-b-PVEA(108)-b-PVMA(53) underwent phase transition at two LCST temperatures. The PVEA(108) block underwent the initial phase transition at the first LCST of 32.5 degrees C to form core-corona micelles, and then the subsequent phase transition of the PVMA(53) block took place at the second LCST of 54.5 degrees C to produce corona collapsed micelles. The proposed polymers based on poly[N-(4-vinylbenzyl)-N,N-dialkylamine] are anticipated to broaden the thermo-responsive polymer range and will be useful in polymer science.

引用

页码：3137 / 3146

页数：10

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