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Effect of temperature gradient on the development of β phase polypropylene in dynamically vulcanized PP/EPDM blends.
- Source :
-
Colloid & Polymer Science . Oct2009, Vol. 287 Issue 10, p1237-1242. 6p. - Publication Year :
- 2009
-
Abstract
- Abstract  Different sample thicknesses were adopted to investigate the effect of temperature gradient on the development of β phase polypropylene (PP) in the compression-molded dynamically vulcanized thermoplastic elastomers (TPVs) based on PP/ethylene-propylene-diene rubber blend. Differential scanning calorimetry and wide-angle X-ray diffraction were employed to study the melting behavior and crystalline structures. The results indicated that the content of β phase increased with the sample thickness of TPV increasing, while the total crystallinity of PP almost kept constant. The simulation of the temperature field showed that there was a temperature gradient along the direction of sample thickness, and the strength of the temperature gradient increased with the thickness of TPV increasing. The reason for the change of β phase content was found to lie in the reduction of the entropy in the temperature gradient field, which was a result from the decrease of the molecular chain conformation. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0303402X
- Volume :
- 287
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Colloid & Polymer Science
- Publication Type :
- Academic Journal
- Accession number :
- 44777020
- Full Text :
- https://doi.org/10.1007/s00396-009-2092-2