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由新型的阳离子疏水单体二甲基十四烷基(3-丙烯酰胺基丙基)溴化铵(DTAB)与丙烯酰胺(AM)共聚合成了阳离子型疏水缔合共聚物P(DTAB-co-AM),研究了该共聚物与蠕虫状胶束自组装后的协同增黏效应,及改变疏水单体含量对自组装体系黏度的调控作用.制备了十八烷基三甲基氯化铵(CTAC)/水杨酸钠和芥酸钾/三羟乙基苄基氯化铵两类稳定的黏度较大的蠕虫状胶束体系.共聚物P(DTAB-co-AM)与芥酸钾/三羟乙基苄基氯化铵蠕虫状胶束在疏水缔合和静电吸引双重作用下自组装可形成协同增黏的缔合体系,而与CTAC/水杨酸钠阳离子蠕虫状胶束进行自组装由于只有疏水缔合作用,增黏效果不及前者.表观黏度研究表明,随着疏水单体含量的增加,P(DTAB-co-AM)与芥酸钾/三羟乙基苄基氯化铵缔合体系的黏度先增加后降低,当疏水单体含量为0.15 mol%时,缔合体系黏度达到极大值;当疏水单体含量为0.3 mol%时,缔合体系黏度反而低于与阳离子蠕虫状胶束缔合后的黏度.对于共聚物与CTAC/水杨酸钠蠕虫状胶束缔合体系,随着疏水单体含量增加,由于疏水缔合作用与静电排斥作用的相互抵消,致使体系黏度有所下降.由此说明改变疏水单体含量可以达到调控自组装体系黏度的目的.
The cationic hydrophobic associative copolymer P (DTAB-co) was synthesized by the copolymerization of dimethyltetradecyl (3-acrylamidopropyl) ammonium bromide (DTAB) and acrylamide (AM) -AM) was used to investigate the synergistic effect of self-assembly of the copolymer with vermicular micelles and the regulation of the hydrophobic monomer content on the viscosity of the self-assembled system.An octadecyltrimethylammonium chloride (CTAC) / sodium salicylate and erucic acid / trihydroxyethylbenzylammonium chloride.The copolymer P (DTAB-co-AM) and erucic acid / Trishydroxyethylbenzyl ammonium chloride worm-like micelles self-assemble under the dual action of hydrophobic association and electrostatic attraction to form a synergistic thickened association system, but with CTAC / sodium salicylate cationic wormlike micelles Self-assembly due to hydrophobic interaction only, the adhesion effect is less than the former apparent viscosity studies show that, with the increase of hydrophobic monomer content, P (DTAB-co-AM) and erucic acid / trihydroxyethyl benzyl chloride The viscosity of the ammonium chloride association system first increased and then decreased. When the hydrophobic monomer content was 0.15 mol%, the viscosity of the association system reached the maximum value; when the hydrophobic monomer content was 0. 3 mol%, the viscosity of the associative system was lower than that of the cationic micelles.For the worm-like micelles association system with CTAC / sodium salicylate, with the increase of hydrophobic monomer content, Due to the counteraction of the hydrophobic association and electrostatic repulsion, the viscosity of the system decreased, which indicated that the change of the hydrophobic monomer content can achieve the purpose of regulating the viscosity of the self-assembly system.