SC–CO2-assisted rubber dispersion and dynamic vulcanization in blending of PP/EPDM thermoplastic olefin
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Supercritical CO2 (SC–CO2), as a green medium, was induced in the traditional way of preparing polypropylene/ethylene–propylene–diene terpolymer (EPDM) thermoplastic olefin (TPO) by dynamic vulcanization using a twin-screw extruder. The morphology observation suggested that the SC–CO2 not only promoted the rubber dispersion, but also facilitated the rubber dynamic vulcanization; therefore, the crosslinked EPDM particles were more densely distributed in the TPOs prepared with SC–CO2, and existed as a stronger viscoelastic phase restricting the mobility of polymer chains, increasing the complex viscosity and storage modulus and promoting the mechanical properties.
The authors acknowledge the financial support provided by the Teaching and Research Award Program for Outstanding Young Teachers in Higher Education Institutions of Ministry of Education, People’s Republic of China.
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