Study on preparation and properties of PVC/NBR/PVC-g-PMMA composite film

Abstract

In this paper, the graft copolymer PVC-g-PMMA composed of PVC main chain and PMMA side chain is synthesized by atom transfer radical polymerization. And it is added to the polyvinyl chloride/nitrile rubber (PVC/NBR) to prepare the PVC/NBR/PVC-g-PMMA composite film. The effects of PVC-g-PMMA on the mechanical properties, heat-resistant oxygen aging properties and thermal stability of PVC/NBR composite film are investigated. The mechanical performance test results show that after adding PVC-g-PMMA, the mechanical properties of the PVC/NBR composite film is improved. The tensile strength increases by 20.13%, and the elongation at break increases by 14.28%. The test results of heat-resistant oxygen aging performance indicate that after 96 hours of aging, the tensile strength of the PVC/NBR/PVC-g-PMMA composite film increases by 4.88% compared with the PVC/NBR composite film. The thermal stability test results illustrate that after adding PVC-g-PMMA, the residual weight of the PVC/NBR composite film increases by 0.7%, and the maximum thermal decomposition rate reduces by 0.12%/°C. It shows that PVC-g-PMMA not only improves the mechanical properties, thermal stability and aging resistance of PVC/NBR composites, but also enhances the market competitiveness of PVC/NBR composites. It expands the application of PVC/NBR composite materials in the field of decoration and protective coatings.