Abstract: A sulfobetaine amphiphilic polymer, poly(acrylamidecoN,NdimethylNmethacrylamidopropylNpropanesulfonic acid internal saltcoN, Ndodecylacrylamide), was synthesized by using micellar polymerization. The structure of the amphiphilic polymer was characterized by FTIR and 1HNMR. The thickening and viscoelasticity of the amphiphilic polymer in NaCl solution were studied by rotating viscometer and rheometer. The results show that the amphiphilic polymer has the characteristics of salt thickening. The greater salt concentration is, the more obvious its thickening ability is. The increase of salt concentration favors the formation of aggregates of the amphiphilic polymer in solution, and the strength of structure increases, both of which lead to the change of the polymer solution viscoelasticity.

Key words: Amphiphilic polymer,    ,  Salt thickening,    ,  Viscoelasticity,    , Hydrophobic association,    , Cohesive energy

摘要： 采用胶束聚合法合成磺基甜菜碱两亲聚合物丙烯酰胺/N,N-二甲基-N-甲基丙烯酰胺基丙基-N-丙烷磺酸内盐/N,N-十二烷基丙烯酰胺三元共聚物。利用红外光谱和核磁共振氢谱对产物进行表征。通过旋转黏度计和流变仪研究两亲聚合物在NaCl溶液中的增黏性和黏弹性。结果表明,该两亲聚合物具有盐增黏的特性,NaCl质量分数越大,其增黏能力越明显。NaCl质量分数的增大,有利于该两亲聚合物在溶液中聚集体的形成,并且其结构强度随之增大,导致其溶液的黏弹性由黏性流体向弹性流体转变。

关键词: 两亲聚合物,    ,  盐增黏,    ,  黏弹性,    ,  疏水缔合,    , 内聚能