Next Article in Journal
Use of Grafted Voltage Stabilizer to Enhance Dielectric Strength of Cross-Linked Polyethylene
Previous Article in Journal
Biocompatibility of Small-Diameter Vascular Grafts in Different Modes of RGD Modification
Open AccessArticle

Morphology Evolution and Rheological Behaviors of PP/SR Thermoplastic Vulcanizate

1
College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
2
College of Engineering, Zhejiang A&F University, Hangzhou, 311300, China
3
Zhejiang Liniz Advanced Materials Co. Ltd, Hangzhou, 311305, China
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(1), 175; https://doi.org/10.3390/polym11010175
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
Show Figures

Graphical abstract

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.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop