PDMAEMA的ATRP法合成及其温度/pH敏感性行为研究  

The synthesis and temperature/pH-sensitive behavior research of PDMAEMA via ATRP

作　　者：周晚珠[1] 叶红齐[1] 刘辉[1,2] 崔欢庆[1] 王瑞萌[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083 [2]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《应用化工》2013年第7期1165-1169,共5页Applied Chemical Industry

基　　金：国家自然科学基金(21276284);湖南省自然科学基金(11JJ3025);中南大学硕士学位论文创新资助项目(2011ssxt086)

摘　　要：采用原子转移自由基聚合法合成了聚甲基丙烯酸-N,N-二甲氨基乙酯(PDMAEMA),研究了聚合物在水中的pH/温度敏感行为。结果表明,当溶液pH值小于聚合物离解常数(pKa)时,聚合物链呈现舒展构象,无相变;当pH值大于pKa时,PDMAEMA发生去质子化作用,部分聚合物析出,且对应的低临界溶解温度值随pH升高而降低。同时,PDMAEMA在水中的平衡溶胀度随pH值增大及温度升高而降低,即PDMAEMA具有明显的pH及温度敏感特性。Poly（2-（dimethylamino）ethyl methacrylate）was synthesized via atom transfer radical polymerization（ATRP）,and spectrophotometric and swelling ratio（SR）were employed to assess the pH and temperature sensitive behaviors of the resulting PDMAEMA,respectively.When the pH of solution is lower than pKa,the polymer chains were stretched without phase change.Whereas,part of polymer chains were precipitated due to the deprotonation of PDMAEMA,and low critical solution temperature（LCST）decreases with the increasing pH.Also,the equilibrium swelling ratio（ESR）is reduced with the increase of both pH and temperature.All these evidence illustrated that PDMAEMA polymer has obvious pH and temperature sensitive behaviors.

关 键 词：聚甲基丙烯酸-N N-二甲氨基乙酯 原子转移自由基聚合 PH 温度敏感 低临界溶解温度 溶胀度 

分 类 号：TQ317.4[化学工程—高聚物工业] O631[理学—高分子化学]