The dynamic mechanical analysis, impact, and morphological studies of EPDM–PVC and MMA-g-EPDM–PVC blends

✍ Scribed by Dayal Singh; V. P. Malhotra; J. L. Vats

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 325 KB
• Volume: 71
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19990321)71:12<1959::aid-app5>3.0.co;2-h

✦ Synopsis

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 EЈ curve, while the EЉ curve showed two glass transition temperatures for EPDM-PVC and MMA-g-EPDM-PVC blends, and the T g increased with increasing graft content, indicating the incompatibility of these blends. The tan ␦ curve showed three dispersion regions for all blends arising from the ␣, ␤, and ⌫ transitions of the molecules. The sharp ␣ 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.