阴离子疏水缔合共聚物/阳离子蠕虫状胶束协同增粘自组装网络

将阴离子疏水缔合丙烯酰胺共聚物P(NaAMC14S-b-AM)与阳离子蠕虫状胶束十六烷基三甲基溴化铵/水杨酸钠(CTAB/NaSal)在水溶液中自组装制备了新型的缔合增粘体. 由稳态剪切和动态流变实验结果得出: 自组装体系在80 ℃下仍具有显著的协同增粘效应, 其流变行为符合Maxwell模型. 同蠕虫状胶束相比, 自组装体系的稳态模量G0、力学松弛时间τR和缠结点密度ν都有增加, 由此分析缔合体系中两组分间形成了相互缠结的网络结构, 在链缠结处共聚物主链上的疏水侧链嵌入到了蠕虫状胶束的内核.

Self-assembly Networks of Anionic Hydrophobic Association Copolymer and Cationic Wormlike Micelles with Synergistic Enhanced Viscosity

A novel type of viscosity enhancement system composed of anionic hydrophobic association polyacrylamide P(NaAMC14S-b-AM) and cationic wormlike micelles, cetyltrimethylammonium bromide/sodium salicylate (CTAB/NaSal), was self-assembled in aqueous solution. The results of steady-state measurements and dynamic rheological experiments show that the self-assembly system has synergistic effects in aqueous solution at even 80 ℃, and also its rheological behavior complies with Maxwell model. The rheological parameters, such as plateau modulus G0, relaxation time τR and the number density of entanglements ν, in the self-assembly system are all higher than those of the wormlike micelles. Therefore, it was suggested that the entangled networks between wormlike micelles and polymer chains be formed and also the hydrophobic “sticker” in copolymer chain embed into the core of wormlike micelles under both the hydrophobic association and electrostatic interactions.