The antioxidant-stabilizer depletion of four 1.5-mm HDPE geomembranes from the same manufacturer each with a different resin and additive package is examined in air and a synthetic municipal solid waste leachate at a range of temperatures (40–95°C) for 7.5 years. Two were formulated for high temperatures and used polyethylene of raised temperature resistance (PE-RT) resins while two used more conventional HDPE geomembrane formulations. The depletion of protective antioxidants and stabilizers was monitored using standard and high-pressure oxidative induction time (OIT) tests and the notably different depletion times for both OIT tests implied they were detecting different groups of AO-S. Although both PE-RT GMBs showed significantly slower AO-S depletion at 85°C in air compared to the conventional PE GMBs, only one PE-RT GMB maintained this status in 85°C leachate, highlighting the limitation of air aging tests (and importance of fluid immersion tests). The importance of running immersion tests long enough to reveal the residual HP-OIT value is stressed. The roles of stabilizer mobility and solubility in polyethylene and their suspected involvement in residual HP-OIT behavior are also illustrated.

中文翻译：

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城市固体垃圾渗滤液中 4 个具有高 HP-OIT 的 HDPE 土工膜的抗氧化剂稳定剂消耗

在空气和合成城市固体废物渗滤液中，在一定温度范围 (40–95°C) 下，对来自同一制造商的四种 1.5 毫米 HDPE 土工膜（每种土工膜均采用不同的树脂和添加剂包）进行 7.5 年的抗氧化剂稳定剂消耗检测。其中两种是针对高温配制的，并使用耐高温聚乙烯 (PE-RT) 树脂，而两种则使用更传统的 HDPE 土工膜配方。使用标准和高压氧化诱导时间 (OIT) 测试来监测保护性抗氧化剂和稳定剂的消耗，两种 OIT 测试的明显不同的消耗时间表明它们正在检测不同组的 AO-S。尽管与传统 PE GMB 相比，两种 PE-RT GMB 在 85°C 空气中的 AO-S 消耗速度明显较慢，只有一个 PE-RT GMB 在 85°C 渗滤液中保持这种状态，凸显了空气老化测试的局限性（以及液体浸没测试的重要性）。强调了运行足够长的浸泡测试以揭示残余 HP-OIT 值的重要性。还说明了稳定剂在聚乙烯中的流动性和溶解度的作用以及它们对残留 HP-OIT 行为的怀疑参与。