低浓度部分水解聚丙烯酰胺/柠檬酸铝交联体系剪切稳定性研究  

STUDY ON THE SHEAR-STABILITY OF LOW CONCENTRATION HPAM/AlCIT CROSSLINKED POLYMER SYSTEM

作　　者：林梅钦[1] 辛见[1] 李明远[1] 董朝霞[1] 吴肇亮[1] 

机构地区：[1]中国石油大学提高采收率研究中心,北京102249

出　　处：《高分子学报》2008年第1期8-12,共5页Acta Polymerica Sinica

基　　金：中国石油大学重质油国家重点实验室开放基金资助项目(基金号200409)

摘　　要：采用粘度法、核孔膜过滤和动态光散射(DLS)法,研究了高分子量低浓度的部分水解聚丙烯酰胺(HPAM)与柠檬酸铝(AlCit)反应所形成的交联体系的剪切稳定性和HPAM剪切降解后与AlCit反应所形成的体系的封堵性能及降解机理.研究结果表明,低浓度的HPAM与AlCit反应所形成的交联聚合物体系随剪切速率增加,其对1.2μm的核孔膜的封堵能力降低.HPAM稀溶液剪切降解后再与AlCit反应,低剪切速率对其封堵性能影响较小,而高剪切速率会使得其封堵性能大大降低.HPAM/AlCit交联体系和HPAM剪切降解后形成的交联体系的封堵性能下降的原因是HPAM/AlCit交联体系中交联聚合物线团(LPC)尺寸和HPAM中高分子线团的尺寸变小.The shear stability and degradation mechanism of crosslinked polymer systems comprising of lowconcentration and high molecular weight partially hydrolyzed polyacrylamides （HPAM） and aluminum citrate （AlCit） were investigated by viscometry, nuclear pore membrane filtration and dynamic light scattering. The results indicated that the filtering rate in 1.2 μm nuclear pore membrane of crosslinked polymer system formed by lowconcentration HPAM and AlCit increased and the plugging efficiency decreased, while the shear rate became high. The shear stability of this system was not good, so its plugging efficiency was weak under shear. For crosslinked polymer systems formed by the degraded HPAM in high shear rate and AlCit, the plugging efficiency was little affected under low shear rates, but was lowered obviously in the range of high shear rate. The cross-linked polymersystem formed by the degraded HPAM in high shear rate was almost not able to plug the 1.2μm nuclear pore membrane,but was able to plug the 0.4μm nuclear pore membrane. Low concentration HPAM which had the same concentration with the former could not plug the 0.4μm nuclear pore membrane, but the pore membrane with a lesssmall pore diameter after shear. The size of cross-linked polymer coils （LPC） in the erosslinked polymer system and the low concentration HPAM and high molecular weight partially hydrolyzed polyacrylamides （HPAM） coils gradually became smaller while the shear rate became high. The reason that the plugging efficiency of cross-linkedpolymer system after degradation decreased at high shear rate was that the size of LPC and high molecular weight partially hydrolyzed polyacrylamides （HPAM） coils became smaller because of the rupture of crosslinked polymer coils （LPC） and the partially hydrolyzed polyacrylamides （HPAM） molecules.

关 键 词：部分水解聚丙烯酰胺 柠檬酸铝 交联聚合物体系 交联聚合物线团 降解 

分 类 号：O631.3[理学—高分子化学]