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Morphology Evolution and Rheological Behaviors of PP/SR Thermoplastic Vulcanizate

College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
College of Engineering, Zhejiang A&F University, Hangzhou, 311300, China
Zhejiang Liniz Advanced Materials Co. Ltd, Hangzhou, 311305, China
Authors to whom correspondence should be addressed.
Polymers 2019, 11(1), 175;
Received: 11 December 2018 / Revised: 24 December 2018 / Accepted: 17 January 2019 / Published: 19 January 2019
The thermoplastic vulcanizates (TPVs) of polypropylene (PP)/silicone rubber (SR) were prepared by dynamic vulcanization (DV) technology. The mixing torque, morphology, viscoelasticity, and creep response of PP/SR TPVs were investigated by torque rheometer, scanning electron microscope (SEM), transmission electron microscope (TEM), rotational rheometer, and dynamic mechanical analysis (DMA). A mixing-torque study showed that torque change and dynamic-vulcanization time increased with SR content increasing in the DV process, but DV rate was independent of SR content. TEM images indicated that the phase inversion of PP/SR-60 TPV from bicontinuous to a sea–island structure took place in the DV process, and a hot press would break the rubber aggregates and shrink a large SR phase. Dynamic-strain measurement demonstrated that PP/SR TPVs exhibit a distinct “Payne effect”, which can be attributed to the destruction and reconstruction of SR physical networks. Complex viscosity indicated that SR content did not affect the processability of PP/SR TPVs at high shear rates. Furthermore, the creep deformation and recovery of PP/SR TPVs at solid and melt states were studied, respectively. View Full-Text
Keywords: silicone rubber; polypropylene; thermalplastic vulcanizates; viscoelasticity; creep silicone rubber; polypropylene; thermalplastic vulcanizates; viscoelasticity; creep
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MDPI and ACS Style

Wu, Q.; Fang, J.; Zheng, M.; Luo, Y.; Wang, X.; Xu, L.; Zhang, C. Morphology Evolution and Rheological Behaviors of PP/SR Thermoplastic Vulcanizate. Polymers 2019, 11, 175.

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