孪尾疏水缔合水溶性共聚物聚(丙烯酰胺/丙烯酸钠/N,N-二己基丙烯酰胺)/十二烷基硫酸钠水溶液的粘度行为

Aqueous Solution Viscosity of Hydrophobically Associating Twin-Tailed Acrylamido Terpolymers

采用先加碱自由基胶束共聚-共水解的方法制备了孪尾疏水缔合水溶性共聚物聚(丙烯酰胺/丙烯酸钠/N,N-二己基丙烯酰胺)[P(AM/NaAA/DiC_6AM)]。十二烷基硫酸钠(SDS)在一定浓度范围内能显著增加P(AM/NaAA/DiC_6AM)的表观粘度、降低其临界缔合浓度。研究了疏水单体含量、SDS与疏水单体的摩尔比率[n(SDS)/n(疏水单体)]、温度及剪切速率对未纯化P(AM/NaAA/DiC_6AM)水溶液的粘度行为。结果表明,未纯化P(AM/NaAA/DiC_6AM)水溶液的表观粘度随n(SDS)/n(疏水单体)、温度以及剪切速率的增大而降低,随疏水单体含量的增加先升高再降低。疏水单体含量在0.125％～0.375％、n(SDS)/n(疏水单体)在10～20范围内溶解性能较好、粘度较高。

A series of hydrophobically associating twin-tailed water-soluble terpolymers poly(acrylamide/sodium acrylate/dihexylacrylamide) [P(AM/NaAA/DiC_6AM)] were synthesized by radical micellar copolymerization. Their apparent viscosities were found to be increased and their critical associating concentrations decreased dramatically in the presence of sodium dodecyl sulfate (SDS). The effects of the surfactant to hydrophobic monomer molar ratio[n(SDS)/n (hydrophobic monomer)], the hydrophobic momomer content, temperature and shear rate on aqueous solution viscosity of the unpurified terpolymers have been investigated. The apparent viscosities of the unpurified terpolymers were decreased with the increase in n(SDS)/n(hydrophobic monomer), temperature and shear rate; but increased firstly and then decreased with increase in the hydrophobic momomer content. The terpolymers showed a superior dissolution property when the hydrophobic momomer contents are from 0.125% to 0.375%, n(SDS)/n(hydrophobic monomer)are from 10% to 20%