α to β phase transformation and microestructural changes of PVDF films induced by uniaxial stretch

Citation data:

Journal of Macromolecular Science, Part B: Physics, ISSN: 0022-2348, Vol: 48, Issue: 3, Page: 514-525

Publication Year:
2009
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Repository URL:
http://ro.uow.edu.au/eispapers/3740
DOI:
10.1080/00222340902837527
Author(s):
V. Sencadas ; R. Gregorio Jr. ; S. Lanceros-Méndez
Publisher(s):
Informa UK Limited; Taylor & Francis Group
Tags:
Chemistry; Physics and Astronomy; Materials Science; stretch; uniaxial; induced; transformation; films; phase; pvdf; changes; microestructural; Engineering; Science and Technology Studies
article description
The phase transformation from to poly(vinylidene fluoride) (PVDF) through a stretching process at different temperatures was investigated. Samples of originally -PVDF were stretched uniaxially at different temperatures at draw ratios from 1 to 5. The stretched samples were studied and characterized by infrared spectroscopy, scanning electron microscopy, and differential scanning calorimetry. The maximum -phase content was achieved at 80C and a stretch ratio of 5, but the samples still showed 20% of the original -phase. Accompanying the phase transformation, an orientation of the polymer chains was observed. The stretching process also influenced the degree of crystallinity of the polymer. Poling of the samples also improves the - to -phase transformation.