不同疏水缔合聚合物之间协同效应的研究

The Synergistic Effect Between Different Hydrophobically Associating Polymers

摘要:

摘要：将丙烯酰胺（AM）/丙烯酸钠（NaAA）/十六烷基二甲基烯丙基氯化铵（C16DMAAC）共聚物PA与丙烯酰胺（AM）/丙烯酸钠（NaAA）/2-丙烯酰胺基十四烷基磺酸钠（NaAMC14S）共聚物PB混合得到混合溶液PA/PB。在5000 mg/L NaCl溶液中固定聚合物浓度为2000 mg/L的条件下，以粘度为依据确定了PA与PB的最佳复配比为3:7，此时混合溶液PA/PB表观粘度为62.7 mPa•s，高于单一聚合物溶液PA和PB的粘度。在最佳复合配比下，考察了NaCl浓度、温度、剪切速率及聚合物浓度对混合溶液PA/PB粘度的影响，结果表明混合溶液PA/PB具有比单一聚合物溶液PA和PB更好的耐温抗盐、抗剪切性能和增黏性能，证实PA与PB之间存在明显的协同效应。通过流变性测试获得特征松弛时间（TR）和平台区模量（G0）研究了两者的协同机理，表明混合溶液PA/PB网络结构交联点密度高于PA和PB，且强度强于PA和PB。

Abstract:

Abstract: The copolymer (PA) of acrylamide/sodium acrylate/cetyl dimethyl ammonium chloride and the copolymer (PB) of acrylamide/sodium acrylate/sodium 2-acrylamido-tetradecyl sulfonate were blended to form mixed solution (PA/PB system). Fixing the polymer concentration (2000 mg/L) in 5000 mg/L NaCl, based on the apparent viscosity, the optimum compound ratio (3:7) of PA to PB was obtained. At this ratio, the apparent viscosity of PA/PB system was up to 62.7 mPa•s, which was higher than that of PA or PB. Additionally, the effects of NaCl concentration, temperature, shear rate and polymer concentration on the viscosity of mixed system were investigated, which show that the PA/PB system exhibited and there were significant synergistic effects between PA and PB. On the other hand, the characteristic relaxation time (TR) and the platform area modulus (G0) were obtained by rheology measurement to study the synergistic mechanism. The result indicates that the number and structural strength of association structures of mixed system were larger than that of mono-component polymer PA or PB.