Dynamic mechanical analysis, impact, and morphological studies of EPDM-PVC and MMA-g-EPDM-PVC blends

摘要

The dynamic mechanical studies, impact resistance, and scanning electron microscopic studies of ethylene propylene diene terpolymer-poly(vinyl chloride) (EPDM-PVC) and methyl methacrylate grafted EPDM rubber (MMA-g-EPDM)-PVC (graft contents of 4, 13, 21, and 32%) blends were undertaken. All the regions of viscoelasticity were present in the E prime curve, while the E double prime curve showed two glass transition temperatures for EPDM-PVC and MMA-g-EPDM-PVC blends, and the Tg increased with increasing graft content, indicating the incompatibility of these blends. The tan δ curve showed three dispersion regions for all blends arising from the α,β, and Γ transitions of the molecules. The sharp α transition peak shifted to higher temperatures with increasing concentration of the graft copolymer in the blends. EPDM showed less improvement while a sixfold increase in impact strength was noticed with the grafted EPDM. The scanning electron microscopy micrographs of EPDM-PVC showed less interaction between the phases in comparison to MMA-g-EPDM-PVC blends.