Abstract
In this study, thermoplastic elastomers based on polypropylene (PP) and ethylene-propylene-diene terpolymer (EPDM) were prepared via direct melt blending in a novel vane extruder. The influence of processing temperature and rotor speed on the degree of cross-linking of the EPDM phase, the tensile properties, the melting behavior and the crystallization morphology of PP/EPDM blends was investigated. It was observed that the volume fraction (Vr) of the vulcanizate arriving swelling equilibrium reached the maximum value when the processing temperature was 190°C. The tensile properties showed better performance at 195°C, at which the PP/EPDM blend obtained good dispersive mixing performance. Moreover, the Vr of the vulcanizate arriving swelling equilibrium reached the maximum value when the rotor speed was 60 rpm, at which the dispersive mixing performance and tensile properties of the PP/EPDM blend were better.
Acknowledgments:
The authors wish to acknowledge the National Natural Science Foundation of China-Guangdong Joint Foundation Project (U1201242), 973 Program (2012CB025902), the Major Scientific Research Projects of Guangdong Province (2014B010132002), the National Research Foundation for the Doctoral Program of Higher Education of China (20120172130004), the Special-funded Program on National Key Scientific Instruments and Equipment Development of China (Grant no. 2012YQ230043), the National Nature Science Foundation of China (Grant no. 51435005) and Young Scientists Fund of the National Natural Science Foundation of China (Grant no. 51403068) for financial support.
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