Journal
POLYMER
Volume 50, Issue 16, Pages 4122-4127Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2009.06.035
Keywords
Spatial confinement; beta Phase; Dynamically vulcanized PP/EPDM (TPV)
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Funding
- National Natural Science Foundation of China [20734005]
- Program for New Century Excellent Talents in University
- National Ministry of Education, China [20060610029]
- Special Funds for Major Basic Research of China [2005CB623808]
- IPRS (international Postgraduate Research Scholarship, Australia)
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The focus of this study was the effect of spatial confinement on the development of nucleating agent-induced beta phase polypropylene (PP) in the dynamically vulcanized thermoplastic elastomers (TPVs) based on dynamically vulcanized PP/ethylene-propylene-diene rubber (EPDM) blend. The melting behaviors, crystalline structures and the morphologies of the blends were studied by differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD) and scanning electron microscopy (SEM). The results indicate that the EPDM phase undergoes a series of changes from the dispersed phase to a continuous one, and again to the dispersed phase with increased content of curing agent, and the PP component always shows itself in a continuous phase. In this process, with the content of the nucleating agent unchanged, the content of beta phase PP in the blends initially increases a little and then decreases with increasing PF (Phenolic resin) content. We believe spatial confinement provides a good explanation for the development of beta phase PP. (C) 2009 Elsevier Ltd. All rights reserved.
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