In this study, inverse emulsion polymerization (IEP) of acrylamide (AAm) and 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS) was conducted with a constant monomer AAm/AMPS feed ratio of 80%:20%. The effects of important reaction parameters on monomer conversion, intrinsic viscosity and molecular weight of nanostructured polymers (NSPs) were comprehensively assessed and the optimal synthesis conditions (in terms of the high molecular weight characteristics) was obtained using Box–Behnken design (BBD) combined with response surface methodology (RSM). The glass transition temperature (T_g) of the synthesized NSP was obtained at 165 °C by differential scanning calorimetry (DSC). The rheology measurements demonstrated the long–term stability of the synthetized NSPs after 50 days of aging at 90 °C within the 87,000 ppm brine. Regarding the high molecular weight and acceptable long–term stability at elevated temperatures and salinity levels, the synthesized NSP could be considered as potential candidates for enhanced oil recovery (EOR) applications under harsh condition reservoirs.

在这项研究中，以恒定的单体AAm / AMPS进料比为80％：20％进行了丙烯酰胺（AAm）和2-丙烯酰胺基-2-甲基-1-丙烷磺酸（AMPS）的反相乳液聚合（IEP）。综合评估了重要反应参数对单体转化率，特性粘度和纳米结构聚合物（NSP）分子量的影响，并结合Box-Behnken设计（BBD）获得了最佳合成条件（就高分子量特性而言）使用响应面方法（RSM）。玻璃化温度（T _g通过差示扫描量热法（DSC）在165°C下获得合成的NSP的）。流变学测量表明合成的NSP在90°C的87,000 ppm盐水中老化50天后具有长期稳定性。关于高分子量和在升高的温度和盐度水平下可接受的长期稳定性，合成的NSP可以被视为在恶劣条件下提高油采收率（EOR）应用的潜在候选者。