高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (7): 1311.

• 论文 • 上一篇    下一篇

温敏两亲性接枝物PAM-g-PNIPAm的合成及表征

郭睿威, 鹿现栋, 方道斌   

  1. 天津大学化工学院高分子科学与工程系, 天津 300072
  • 收稿日期:2002-05-28 出版日期:2003-07-24 发布日期:2003-07-24
  • 通讯作者: 郭睿威(1963年出生),男,硕士,副教授,主要从事水溶性聚合物的研究.E-mail:rwguo@public.tpt.t.jcn E-mail:rwguo@public.tpt.t.jcn

Synthesis and Characterization of Thermoassociating Graft Copolymer PAM-g-PNIPAm

GUO Rui-Wei, LU Xian-Dong, FANG Dao-Bin   

  1. Department of Polymer Science and Engineering, College of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • Received:2002-05-28 Online:2003-07-24 Published:2003-07-24

摘要: 以巯基乙胺为分子量调节剂,以丙烯酰氯作为链端转化剂合成了不同分子量的端丙烯酰胺基聚(N-异丙基丙烯酰胺)(PNIPAm)大分子单体;与丙烯酰胺共聚合,合成了以PNIPAm为侧链的接枝聚丙烯酰胺.用FTIR和1HNMR方法表征了接枝聚合物与大分子单体的组成.该接枝聚合物在水溶液中具有热缔合特性及明显的温敏增稠性,水溶液的粘度在32~50℃之间随温度增加而增加.

关键词: 大分子单体, PAM-g-PNIPAm, 温敏增稠, 两亲性接枝聚合物

Abstract: The graft copolymers polyacrylamide-graft-poly(N-isopropylacrylamide) were synthesized by polymerization of acrylamide and macromonomers poly(N-isopropylacrylamide) with acrylamide end group in aqueous solution. The macromonomers with different molecular weights were prepared by 2 steps: (1) synthesis of amino-end functionalized poly(N-isopropylacrylamide) macromonomer by radical polymerization of NIPAm with 2-aminoethanethiol hydrochloride as chain transfer agent; (2) conversion of amino-end group to acrylamide-end group by reaction with acryloyl chloride. In aqueous solution this graft copolymer shows thermoassociating characters, and its associating temperature is determined by the cloud point of the side chain polymer, independently with the content and length of the PNIPAm side chain. The results show that these graft copolymers have thermothickening effect, i.e. the viscosity of PAM-g-PNIPAm aqueous solution increases with the increasing of temperature above its cloud point.

Key words: Macromonomer, Polyacrylamide-g-poly(N-isopropylacrylamide), Thermoassociating, Amphiphilic graft polymer

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