部分水解聚丙烯酰胺和聚乙烯醇混合溶液的流变性*

Rheological Properties of Partially Hydrolyzed Polyacrylamide and Poly（vinyl alcohol）Mixed Solutions

刘希明 田玉芹 刘伟伟 唐延彦 张冬会 侯万国

LIU Ximing TIAN Yuqin LIU Weiwei TANG Yanyan ZHANG Donghui HOU Wanguo

采用蠕动实验研究了部分水解聚丙烯酰胺（HPAM）和聚乙烯醇（PVA）混合溶液（总质量分数为0.20 %）的流变性（零剪切黏度），主要考察了体系组成比（以HPAM在聚合物中所占质量分数表示，RPH）和电解质（NaCl）浓 度（cNaCl）对流变性的影响，并对HPAM和PVA分子间相互作用机理进行了探讨。结果表明，PVA可通过氢键与HPAM 络合（或交联）形成高分子复合物，其络合 PVA/HPAM 摩尔比约为 90。RPH 在 0~0.7 范围内，HPAM 和PVA混合产生黏度降低效应，其中在RPH = 0.2时黏度降低效应最强。而RPH在0.7~ 1.0范围内，基本无黏度效应。加入NaCl可使混合溶液（RPH = 0.20）产生复合增黏效应，表明聚合物复配可提高HPAM溶液的抗盐能力。本研究加深了对聚合物相互作用行为的认识，为基于HPAM的复配体系在强化采油工程中的应用研究提供了重要信息。图6参31

The rheological properties（zero-shear viscosities）of aqueous solutions containing partially hydrolyzed polyacrylamide （HPAM）and poly（vinyl alcohol）（PVA）were investigated by creep tests at a total mass fraction of 0.20%，and the effect of the mass fraction of HPAM in the two polymers（RPH）and electrolyte（NaCl）concentrations（cNaCl）on the rheological properties was discussed. The interaction mechanism between HPAM and PVA was probed. The results showed that the interpolymer complex could form between HPAM and PVA via hydrogen bonds，and the PVA/HPAM complex molar ratio was about 90. At 0<0.7， the mixing of PVA and HPAM leaded to a“viscosity reduction effect”，and the strongest viscosity reduction effect appeared at RPH = 0.2. At RPH > 0.7，no obvious viscosity effect was observed. The presence of NaCl could lead to a“viscosity increase effect”for PVA/HPAM mixed solution（RPH=0.20），suggesting that the mixing of PVA with HPAM could enhance the salt resistance of HPAM solutions. This work deepened the understanding of interpolymer interaction behavior and provided important information for the application of HPAM-based composites in the enhanced oil recovery.

10.19346/j.cnki.1000-4092.2020.01.020