物理化学学报 >> 2009, Vol. 25 >> Issue (09): 1911-1915.doi: 10.3866/PKU.WHXB20090923

研究论文 上一篇    下一篇

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

王焕霞, 刘守信, 房喻, 韩晓宇, 张飒   

  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
  • 收稿日期:2009-04-13 修回日期:2009-06-15 发布日期:2009-09-03
  • 通讯作者: 刘守信 E-mail:liushx@snnu.edu.cn

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

WANG Huan-Xia, LIU Shou-Xin, FANG Yu, HAN Xiao-Yu, ZHANG Sa   

  1. Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an 710062, P. R. China
  • Received:2009-04-13 Revised:2009-06-15 Published:2009-09-03
  • Contact: LIU Shou-Xin E-mail:liushx@snnu.edu.cn

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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.

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

Abstract:

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 PDEAMaqueous solutions were studied by transmittance measurements. It was found that the LCSTdecreased as the concentration of PDEAMincreased and that salts (NaCl, CH3COONa, KCl, Na2SO4, andMgSO4) resulted in a decrease of the LCST of the solution. Species and anions of the salts dominated the salt effect. On the contrary, sodiumdodecyl sulfate (SDS) resulted in an increase in the LCST of the PDEAMaqueous solutions.

Key words: Temperature sensitivity, Atomtransfer radical polymerization, Poly(N,N-diethylacrylamide), Lower critical solution temperature