Abstract: The weight-average molecular weight (M_w)，root mean square radius (RMS) and second viral coefficient(A₂) of hydrolyzed polyacrylamide (HPAM) were investigated by a static laser light scattering. The results show that there is a relation between M_wand M_η (viscosity-average molecular weight) of HPAM and also point out the difference between ultra-high M_ηsalt-resistant HPAM and conventional HPAM by comparing the micro-performance. All of these show that the limits and errors in the characterization method of HPAM which is still used in some oilfields now. The suggestion is to add some micro-parameters in the characterization methods, so that an effective way can be elected to evaluate the general performances of HPAM correctly and to select more effective polymers which can improve technological and economical effects on Polymer Flooding.

Key words: hydrolyzed polyacrylamide, ultra-high M_η salt-resistant HPAM, weight-average molecular weight(M_w), root mean square radius(RMS), second viral coefficient(A₂), intrinsic viscosity, light scattering

摘要： 利用多角激光光散射法测定了部分水解聚丙烯酰胺（HPAM）的重均分子量、根均方旋转半径、第二维里系数等微观结构性能参数，发现了常规聚合物微观结构性能参数与粘均分子量的联系，同时比较了超高分子量抗盐聚合物与常规聚合物微观结构性能参数的差异，指出粘均分子量等指标表征聚合物性能的误差和局限性，建议在现有评价方法中补充微观结构性能参数，以准确衡量HPAM的综合性能，优选高效聚合物品种，进一步提高聚合物驱的技术经济效果。

关键词: 部分水解聚丙烯酰胺, 超高分子量抗盐聚合物, 重均分子量, 根均方旋转半径, 第二维里系数, 特性粘数, 光散射