疏水缔合水溶性聚(丙烯酰胺/丙烯酸钠/N,N-双烯丙基十二胺)水溶液的粘度行为

VISCOSITY OF AQUEOUS SOLUTION OF HYDROPHOBICALLY ASSOCIATING POLYMERS POLY(ACRYLAMIDE/SODIUM ACRYLATE/N,N-DIALLYL-N-DODECYLAMINE)

采用前加碱二元胶束共聚-共水解法合成了三元疏水缔合水溶性聚合物聚(丙烯酰胺/丙烯酸钠/N,N-双烯丙基十二胺)[P(AM/NaAA/DiAC_(12))],研究了其水溶液的粘度行为。当x(DiAC_(12))=0．10%～0．40%时,在30℃、1 mol/L NaCl溶液中,其特性粘数[η]、Huggins常数K_H、粘均相对分子质量(?)分别为16．38～19．45 dL/g,0．214～0．394和8．36×10~6～10．36×10~6g/mol;K_H小于0．8,表明其分子内缔合作用较弱。P (AM/NaAA/DiAC_(12))在矿化度为19 334μg/g,盐水溶液中的表观粘度随疏水单体用量的增加而增加,随温度、剪切速率的增加而降低。在NaCl、CaCl_2的离子强度分别为1．26×10^(-3)～4．88×10^(-3)和1．07×10^(-4)～5．28×10^(-4)mol/kg的水溶液中,P(AM/NaAA/DiAC_(12))水溶液出现盐增粘现象,疏水单体用量越高,盐增粘效应越显著。

A series of hydrophobically associating water-soluble polymers poly（acrylamide/sodium acrylate/ N,N-diallyl-N-dodecylamine） EP（AM/NaAA/DiAC12）] were prepared by the way of co-hydrolysis with alkali before radically micellar copolymerization. Their solution properties were exam ined. When hydrophobic mole fraction was 0.10%-0. 40% , the intrinsic viscosity values[η], Huggins constant KH and viscosity average molecular weight of the polymers at 30℃ and in 1 mol/L NaCl aqueous solution were 16.38 - 19.45 dL/g, 0. 214 - 0. 394 and 8.36 × 10^6 - 10.36 ;〈 10^6 g/mol , respectively. It was shown that intramolecularly hydrophobically associating interactions in the dilute solution were rather weak because KH was always less than 0.8. In the 19 334 μg/g saline solution, apparent viscosity of the polymers decreased with hydrophobic mole fraction decreasing and with temper ature and shear rate increasing. There appeared viscosity enhancement phenomena in the saline solution of P（AM/NaAA/DiAC12） when the ionic strength of NaCl or CaCl2 were 1.26 × 10^-3 - 4.88× 10^-3 mol/kg or 1. 073 × 10^-4 - 5.28 × 10^-4 mol/kg, respectively. The more the hydrophobic fraction, the stronger the viscosity enhancement effect.