SC–CO2-assisted rubber dispersion and dynamic vulcanization in blending of PP/EPDM thermoplastic olefin
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- Zhao, Y., Huang, HX., Chen, YK. et al. J Mater Sci (2010) 45: 4054. doi:10.1007/s10853-010-4488-2
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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.