Loading…
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...
Saved in:
Published in: | Journal of physics. D, Applied physics Applied physics, 2013-04, Vol.46 (14), p.145307-1-5 |
---|---|
Main Authors: | , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
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 |