文献类型：期刊文献

中文题名：无规共聚物P(MEO_2MA-co-OEGMA)的合成及其在水溶液中温度诱导相转变行为

英文题名：Synthesis of P(MEO_2MA-co-OEGMA) Random Copolymers and Thermally Induced Phase Transition Behaviors in Aqueous Solutions

作者：郭奕[1];刘恒江[1];陈洁琼[1];尚亚卓[1];刘洪来[1]

机构：[1]华东理工大学化学工程联合国家重点实验室,上海200237

年份：2015

卷号：31

期号：10

起止页码：1914

中文期刊名：物理化学学报

外文期刊名：Acta Physico-Chimica Sinica

收录：CSTPCD;;Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000363712300009)】；北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；PubMed;

基金：The project was supported by the National Natural Science Foundation of China (21173079, 91334203, 21476072).

语种：中文

中文关键词：无规聚合物;温度响应;最低临界溶解温度;相转变

外文关键词：Random copolymer; Thermo-responsive; Lower critical solution temperature; Phase transition;

摘要：利用原子转移自由基聚合(ATRP)方法,由单体2-(2-甲氧基乙氧基)甲基丙烯酸乙酯(MEO2MA)和寡聚(乙二醇)甲基醚甲基丙烯酸酯(OEGMA,Mn=500 g mol–1)合成了无规共聚物P(MEO2MA-co-OEGMA).并采用动态光散射(DLS)、紫外光谱及透射电子显微镜(TEM)等技术考察聚合物在水溶液中的温度响应性聚集行为,获得其在水溶液中的最低临界溶解温度(LCST)及其随组成的变化规律.结果表明,该聚合物具有良好且可逆的温度响应行为,这主要归因于聚合物与水分子之间氢键作用,及其分子本身疏水作用之间为了保持一种微妙的动态平衡而自发对聚集形态进行的"自我调整",从而达到新的热力学平衡状态的结果.该聚合物的LCST与聚合物中单体OEGMA所占的摩尔比例呈线性关系,可以通过改变单体的摩尔配比实现对聚合物LCST的调控.
Random copolymers of 2-（2-methoxyethoxy）ethyl methacrylate（MEO2MA） and oligo（ethylene glycol） methacrylate（OEGMA, Mn = 500 g mol^-1） were synthesized by atom transfer radical polymerization（ATRP）. Thermally induced aggregation of the co-polymers P（MEO2MA-co-OEGMA） in aqueous solutions was investigated with dynamic light scattering（DLS）, UV-Vis absorption, and transmission electron microscopy（TEM）. In addition, the lower critical solution temperature（LCST） in aqueous solutions of P（MEO2MA-coOEGMA）, and its change with respect to the composition of the copolymer, were obtained. The results indicate that the copolymers have an appreciably reversible thermal responsivity that can be attributed to a delicate balance between hydrogen bonds between the copolymers and water molecules and hydrophobic interactions of polymer segments. If the balance is broken, the polymers attain a new thermodynamic equilibrium by spontaneously changing the extent of aggregation. The LCST correlates linearly with the mole fraction of OEGMA units in the copolymer, and can be adjusted by changing the mole ratio of the two monomers.