Effect of zeolitic metal–organic framework on thermal, mechanical, and electrical properties of Ca/Zn‐stabilized polyvinyl chloride

Abstract 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.