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Compression-rate dependence of solidified structure from melt in isotactic polypropylene

Melts of isotactic polypropylene are solidified by compression up to 2.3 GPa at different rates varying from 0.012 to115 GPa s−1, which lies between conventionally static and dynamic compression rate scales. Characterization by x-ray diffraction and differential scanning calorimeter of the recovered...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2013-04, Vol.46 (14), p.145307-1-5
Main Authors: Wang, M Y, Liu, X R, Zhang, C R, Zhang, D D, He, Z, Yang, G, Shen, R, Hong, S M
Format: Article
Language:English
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Summary:Melts of isotactic polypropylene are solidified by compression up to 2.3 GPa at different rates varying from 0.012 to115 GPa s−1, which lies between conventionally static and dynamic compression rate scales. Characterization by x-ray diffraction and differential scanning calorimeter of the recovered products indicates that solidified structure is dependent on compression rate. Stable α crystalline is the mainly solidified structure at lower compression rates and the highly disordered mesomorphic phase is solidified at higher compression rates. There exists a very narrow range of compression rates, within which α and mesomorphic phase coexist. For most compression conditions one of the two phases largely predominates on the other one. A critical compression rate to form the mesomorphic phase could be considered in pressure-induced solidification process. A schematic pressure-time-transition diagram is suggested for the studied temperatures. This system could be a model for facilitating the studies of the kinetic nature of pressure-induced phase transitions.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/46/14/145307