疏水缔合水溶性丙烯酰胺—丙烯酸正辛酯共聚物的溶液性能

采用自由基胶束共聚法制备了水溶性的丙烯酰胺丙烯酸正辛酯疏水缔合共聚物。研究了共聚物水溶液的性能及其影响因素。随疏水基团含量增加，共聚物在水中的特性粘数［η］减小，代表分子线团间流体力学相互作用的Ｈｕｇｇｉｎｓ常数ＫＨ增大。随共聚物浓度增加，在临界缔合浓度Ｃ以上，分子间缔合大量形成，水溶液表观粘度急剧增加。

STUDIES ON THE SOLUTION PROPERTIES OF WATER SOLUBLE HYDROPHOBICALLY ASSOCIATING ACRYLAMIDE/n OCTYLACRYLATE COPOLYMERS

A number of water soluble acrylamide/octylacrylate copolymers of octylacrylate cotent 0.25, 0.50, 0.75, and 1.00 mol% is synthesized by the way of radical micellar copolymerization. The intrinsic viscosity of the copolymers decreases and their Huggins parameter K H increases with their OA content. The copolymers cotaining 0.75 and 0.50 mol% of OA show dramatic increase in apparent viscosity in 2% NaCl solution. The unique effects of surfactant SDS and temperature on the solution viscosity of these copolymers are observed. All the experimental results are explained in terms of intra and intermolecular hydrophobical associations, which are relatively weak to thermal and shear action.