疏水缔合聚丙烯酰胺的微观结构研究

MICROSTRUCTURE STUDY OF HYDROPHOBICALLY ASSOCIATING POLYACRYLAMIDE

文章使用荧光光谱、粘度法和冷冻蚀刻透射电镜等手段 ,研究了疏水缔合聚丙烯酰胺 (HAPAM )在水溶液中通过疏水缔合形成疏水微区、超分子聚集体及发展到空间网络的过程。在荧光实验中 ,以芘为探针 ,通过I3 /I1与聚合物浓度的变化关系确定了溶液的临界缔合浓度 ,研究了疏水缔合聚合物在溶液中的缔合状态及网络结构的形成过程。使用透射电镜研究了疏水缔合聚合物溶液的微观结构 ,发现疏水缔合聚合物在一定浓度时可以形成网络结构。通过粘度法证实当溶液中有大量疏水微区生成时 。

With the tools of fluorescence spectrum, rheology method and cryo-etching transmission electron microscope, etc., the process of hydrophobic micro-zones forming, super-molecular polymer creating and spatial network developing by hydrophobic association is studied when the hydrophobically associating polyacrylamide is in aqueous solution. In the fluorescence experiments, taking pyrene as probe, with the plots of I 3 /I 1 vs. polymer concentration, the critical associating concentration of the solution is determined. The associating state of the hydrophobically associating polymer in the solution and the forming process of the network structure are studied. With the transmission electron microscope, the microstructure of the solution of the hydrophobically associating polymer is investigated. It is found the network structure may be formed when the hydrophobically associating polymer reaches a certain concentration. With rheology method, it is proved the viscosity of the polymer solution will increase sharply when large hydrophobic micro-zones are created in the solution.