P（AA/AMPS）与P（AM/AA/AMPS）水溶液高温降解机理研究

Degradation Mechanism of P（AA/AMPS）and P（AM/AA/AMPS）Aqueous Solutions at High Temperature

罗云翔 林凌 余文可 李鑫 古晗 刘洪吉

LUO Yunxiang LIN Ling YUWenke LI Xin GU Han LIU Hongji

为研究丙烯酰胺类聚合物在水溶液中的高温降解机理，以丙烯酰胺（AM）、丙烯酸（AA）、2-丙烯酰胺-2-甲基丙磺酸（AMPS）为单体制备了P（AA/AMPS）、P（AM/AA/AMPS）两种模板聚合物，将两种聚合物分别在200、220、240 ℃下进行降解实验，使用FTIR、1H-NMR、XPS、GPC、TG-IR 等分析聚合物及其降解产物。研究结果表明，丙烯酰胺类聚合物在水溶液中的高温降解行为主要发生在不抗温的侧基，表现为主链次甲基含量的下降。次甲基断键后，主链断裂导致聚合物的相对分子质量降低，降解过程中生成二氧化碳、氨气等小分子。两种聚合物在热重测试中抗温能力与水溶液中的抗温能力矛盾，因此评价丙烯酰胺类钻井液处理剂抗温能力时不能以热重分析结果作为标准。

In order to study the high temperature degradation mechanism of acrylamide polymers in aqueous solution，two template polymers P （AA/AMPS） and P （AM/AA/AMPS） were prepared by using acrylamide （AM）， acrylic acid （AA） and 2-acrylamide-2-methylpropanesulfonic acid （AMPS） as monomers. The two polymers in aqueous solution were degraded at 200 ℃，220 ℃ and 240 ℃，respectively. The polymers and their degradation products were analyzed by FTIR，1H NMR，XPS， GPC and TG-IR. The results showed that the high temperature degradation behavior of acrylamide polymers in aqueous solution mainly occurred in the side groups，which showed that the proportion of methylene in the main chain decreased. After the methylene bond was broken，the main chain was broken，resulting in the reduction of polymer molecular weight，and small molecules，such as carbon dioxide and ammonia，were generated in the degradation process. There is a contradiction between the temperature resistance of the two polymers in thermogravimetric test and that in aqueous solution. TG-DTG cannot be used as a standard to evaluate the temperature resistance of acrylamide drilling fluid treatment agent.

10.19346/j.cnki.1000-4092.2022.02.003