Novel polyvinyl chloride composite via hybrid metal-organic framework grafted polyethyleneimine and layered double hydroxide incorporation: Thermal, rheological, and electrical properties
Reza Shariatmadari, Mohammadreza Kalaee, Ramin Khajavi, Zahra Shariatinia
Abstract
Improving the heat stabilization of polyvinyl chloride (PVC) is of great importance, particularly for its use in electrical insulation. In this study, a novel zeolitic imidazole framework (ZIF-8) was modified using polyethyleneimine (PEI) and layered double hydroxide (LDH) to create a new PVC heat stabilizer. The heat stability of PVC was analyzed using oven, Congo red, and thermogravimetric analysis (TGA) tests, with the dosage of modified ZIF-8 found to have a significant impact on PVC's heat stability (increasing from 33 to 58 min). Additionally, con-calorimetry was performed to evaluate the effect of LDH modification on ZIF-8′s flame retardancy, revealing that LDH delayed flame emission from 255 to 560 s. Lastly, volume resistance and mechanical tests were conducted to assess the effect of the novel ZIF-8 modification on PVC compound properties.