聚(N,N-二乙基丙烯酰胺)的合成及盐对其水溶液温敏性的影响  

Synthesis of Poly(N,N-diethylacrylamide) and the Effect of Salts on the Thermosensitivity of Its Aqueous Solutions

作　　者：王焕霞[1] 刘守信[1] 房喻[1] 韩晓宇[1] 张飒[1] 

机构地区：[1]应用表面与胶体化学教育部重点实验室,陕西师范大学化学与材料科学学院,西安710062

出　　处：《物理化学学报》2009年第9期1911-1915,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20674048)资助项目~~

摘　　要：采用CuBr/2,2′-联二吡啶催化体系,α-溴代丙酸乙酯为引发剂,甲醇为溶剂,通过原子转移自由基聚合(ATRP)合成了分子量分布窄的聚(N,N-二乙基丙烯酰胺)(PDEAM).用FT-IR、1H-NMR和凝胶渗透色谱(GPC)对其结构进行了表征;利用透光率的测定研究了PDEAM水溶液浓度、盐以及表面活性剂对PDEAM水溶液低临界溶解温度(LCST)的影响.结果表明:随着PDEAM水溶液浓度的增大,LCST逐渐降低;NaCl、CH3COONa、KCl、Na2SO4及MgSO4使PDEAM水溶液的LCST降低,降低程度与盐的种类和阴离子价数有关;十二烷基磺酸钠(SDS)则使PDEAM水溶液的LCST升高.Poly（N,N-diethylacrylamide） （PDEAM） with a narrow molecular weight distribution was synthesized via atom transfer radical polymerization （ATRP） in methanol using CuBr/2,2＇-bipyridyl as the catalyst system and ethyl- 2-bromopropionate （EPN-Br） as the initiator. PDEAM was characterized by FT-IR, 1H-NMR, and gel permeation chromatography （GPC）. The effects of PDEAM concentration, salts, and surfactant on the lower critical solution temperature （LCST） of PDEAM aqueous solutions were studied by transmittance measurements. It was found that the LCST decreased as the concentration of PDEAM increased and that salts （NaCl, CH3COONa, KCl, Na2SO4, and MgSO4） resulted in a decrease of the LCST of the solution. Species and anions of the salts dominated the salt effect. On the contrary, sodium dodecyl sulfate （SDS） resulted in an increase in the LCST of the PDEAM aqueous solutions.

关 键 词：温敏性 原子转移自由基聚合 聚(N N-二乙基丙烯酰胺) 低临界溶解温度 

分 类 号：O633.22[理学—高分子化学]