INFLUENCE OF AGING ON THE MECHANICAL-PROPERTIES OF SMECTIC POLYPROPYLENE

Citation
G. Romano et al., INFLUENCE OF AGING ON THE MECHANICAL-PROPERTIES OF SMECTIC POLYPROPYLENE, Journal of macromolecular science. Physics, B37(6), 1998, pp. 841-850
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Polymer Sciences
ISSN journal
0022-2348
Volume
B37
Issue
6
Year of publication
1998
Pages
841 - 850
Database
ISI
SICI code
0022-2348(1998)B37:6<841:IOAOTM>2.0.ZU;2-M
Abstract
Isotactic polypropylene (iPP) was quenched to the smectic state and an alyzed during aging at room temperature for very long times, up to fiv e years. Calorimetric differential scanning calorimetry (DSC) curves, dynamic mechanical behavior, and mechanical properties were used to an alyze the aged samples and data were compared with the results for the fresh sample. The obtained results can be explained by a reduction of free volume of the amorphous phase, as well as a concomitant increase of the smectic domains' dimensions. A good correlation was found betw een some calorimetric and mechanical parameters.