In this work, the structure–property relationships of the thermal gelation of partially hydrolyzed polyacrylamide (PHPA) and polyethylenimine (PEI) mixtures were investigated under realistic conditions of temperature (80 °C) and salinity (total dissolved solids = 3.4 g/l) of the Algerian reservoir (Tin Fouyé Tabankort) prior to a conformance control application. The reactants were characterized with regard to their hydrolysis degree or branching degree using 13 C-nuclear magnetic resonance, and viscosity–average molecular weights ( $$ \bar{M}_{\text{v}} $$ M ¯ v ) were estimated using the Mark–Houwink equation and intrinsic viscosities measurements. The polymers had molecular weights that varied from 5 to 10 × 10 6 g/mol for PHPAs with initial hydrolysis degrees between 6 and 20 mol%, while the molecular weights of the PEI were between 2 and 67 × 10 4 g/mol with a constant branching degree of 57–59. Consequently, the effect of steady shear on the gelation time was investigated followed by the effect of reactant concentrations, the polymer and cross-linker molecular weights, the polymer’s hydrolysis degree, the temperature and the initial pH. All experiments were conducted in a semidilute concentration regime while maintaining practical initial gelant viscosities. As a result, the gelation time was found to decrease with reactant concentrations, molecular weights and temperature ( E a = 62 kJ/mol) and to increase with hydrolysis degree.

中文翻译：

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部分水解聚丙烯酰胺/聚乙烯亚胺混合物在半稀释状态下热凝胶的结构-性能关系

在这项工作中，在温度 (80 °C) 和盐度（总溶解固体 = 3.4 g/l）的现实条件下，研究了部分水解聚丙烯酰胺 (PHPA) 和聚乙烯亚胺 (PEI) 混合物的热凝胶结构-性能关系在一致性控制应用程序之前的阿尔及利亚水库 (Tin Fouyé Tabankort)。使用 13 C-核磁共振对反应物的水解度或支化度进行表征，粘均分子量（ $$ \bar{M}_{\text{v}} $$ M¯ v ）为使用 Mark-Houwink 方程和特性粘度测量估计。对于初始水解度在 6 到 20 mol% 之间的 PHPA，聚合物的分子量从 5 到 10 × 10 6 g/mol 不等，而 PEI 的分子量介于 2 和 67 × 10 4 g/mol 之间，支化度为 57-59。因此，研究了稳定剪切对凝胶时间的影响，然后是反应物浓度、聚合物和交联剂分子量、聚合物的水解度、温度和初始 pH 值的影响。所有实验均在半稀释浓度方案中进行，同时保持实际的初始胶凝剂粘度。结果，发现胶凝时间随着反应物浓度、分子量和温度（E a = 62 kJ/mol）而减少，并随着水解度而增加。聚合物和交联剂的分子量、聚合物的水解度、温度和初始 pH 值。所有实验均在半稀释浓度方案中进行，同时保持实际的初始胶凝剂粘度。结果，发现胶凝时间随着反应物浓度、分子量和温度（E a = 62 kJ/mol）而减少，并随着水解度而增加。聚合物和交联剂的分子量、聚合物的水解度、温度和初始 pH 值。所有实验均在半稀释浓度方案中进行，同时保持实际的初始胶凝剂粘度。结果，发现胶凝时间随着反应物浓度、分子量和温度（E a = 62 kJ/mol）而减少，并随着水解度而增加。