氟碳改性聚丙烯酰胺共聚物的溶液性质  

Solution Behavior of Fluorocarbon-modified Polyacrylamide Copolymers

作　　者：步怀天[1] 杨振忠[1] 章云祥[2] 

机构地区：[1]中国科学院化学研究所分子科学中心,高分子物理与化学国家重点实验室,北京100080 [2]中国科学院上海有机化学研究所,上海200032

出　　处：《化学学报》2002年第9期1707-1711,共5页Acta Chimica Sinica

摘　　要：研究了氟碳链改性的聚丙烯酰胺水溶液的溶液性质及其对盐浓度的依赖性 ,重点考察了氟碳疏水组分含量、盐浓度对特性粘数的影响 ,以及粘度随剪切速率和温度的变化关系 .结果表明聚合物溶液的粘度随盐的引入而增大 ,但在两种溶液中最小值对应的共聚单体含量一致 .随温度的增加 ,共聚物溶液粘度依次出现了最小和最大值 .所有实验结果均归于溶液中存在的疏水和氢键两种相反作用的综合结果 .The properties of fluorocarbon-modified polyacrylamide aqueous solutions are investigated, including rheological behavior, intrinsic viscosity and their dependence on temperature and the addition of salts. It is found that hydrogen bond strength and hydrophobic association of the solutions are remarkably influenced by the content and chemical structure of the hydrophobic co-monomers. The viscosity reaches a minimum when molar content of the co-monomers is 0.14%, and all samples' viscosity increases with the addition of salts. With the increase in temperature, there exist two peaks corresponding to the minimum and maximum viscosity. All the experimental results could be explained by the competitive contribution to viscosity from hydrogen interaction and hydrophobic association in the solutions.

关 键 词：溶液性质 聚丙烯酰胺 氟碳链改性 疏水缔合作用 氢键 流变行为 粘度 

分 类 号：O633.22[理学—高分子化学] O631.4[理学—化学]