In order to enhance the heat stability of polyvinyl chloride (PVC), several heat stabilizing parameters such as metal content, antioxidant percentage, primary-to-secondary antioxidant ratios, stearic-to-acetylacetonate ratio, the amounts of pentaerythritol and β-diketone were studied using oven and Congo red tests. Results indicated that the percentage contribution of the calcium-to-zinc molar ratio in the static heat stability was 60.78%. Due to the synergistic effects of the calcium/zinc stabilizer and the zeolitic metal–organic framework (MOF) as an effective co-stabilizer, the heat stability was increased from 109 to 148 min. The EDX analysis was carried out to determine the mechanism of HCl gas absorption by the zeolitic imidazolate framework-8 (ZIF-8) existing in the PVC compound. Furthermore, the Ca/Zn thermal stabilizer showed poor electrical insulating properties, but the ZIF-8 improved electrical resistivity of the PVC compounds. Volume resistivity of ZIF-8 was significantly higher than that of the commonly used Ca/Zn stabilizers. Dynamic mechanical thermal analysis and tensile test of the PVC compound containing the ZIF-8 showed increased T_g and enhanced toughness.

中文翻译：

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沸石金属-有机骨架对Ca/Zn稳定聚氯乙烯的热、机械和电性能的影响

为了提高聚氯乙烯（PVC）的热稳定性，对金属含量、抗氧化剂百分比、一级与二级抗氧化剂的比例、硬脂酸与乙酰丙酮的比例、季戊四醇和β-二酮的含量等几个热稳定参数进行了调整。使用烤箱和刚果红测试进行研究。结果表明，钙锌摩尔比对静态热稳定性的贡献率为60.78%。由于钙/锌稳定剂和沸石金属有机骨架 (MOF) 作为有效的共稳定剂的协同作用，热稳定性从 109 分钟增加到 148 分钟。进行 EDX 分析以确定 PVC 化合物中存在的沸石咪唑酯骨架 8 (ZIF-8) 吸收 HCl 气体的机制。此外，Ca/Zn 热稳定剂显示出较差的电绝缘性能，但 ZIF-8 改善了 PVC 化合物的电阻率。ZIF-8 的体积电阻率明显高于常用的 Ca/Zn 稳定剂。含有 ZIF-8 的 PVC 化合物的动态机械热分析和拉伸试验表明 T_g和增强的韧性。