Cavitation in strained polyvinylidene fluoride: mechanical and X-ray experimental studies

Citation
S. Castagnet et al., Cavitation in strained polyvinylidene fluoride: mechanical and X-ray experimental studies, POLYMER, 41(20), 2000, pp. 7523-7530
Citations number
17
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
POLYMER
ISSN journal
00323861 → ACNP
Volume
41
Issue
20
Year of publication
2000
Pages
7523 - 7530
Database
ISI
SICI code
0032-3861(200009)41:20<7523:CISPFM>2.0.ZU;2-M
Abstract
PolyVinylidene Fluoride (PVDF) is a polar crystalline polymer commonly foun d in the apolar alpha crystalline form studied here. The complementarity of a macroscopic (tensile tests at constant crosshead speed) and a microscopi c approach (Small-Angle X-ray Scattering and Wide-Angle X-ray Scattering) s pecifies the cavitation phenomenon occurring in this material when strained . Ar room temperature, microvoids nucleate predominantly in equatorial intr aspherulitic amorphous layers, just before the yield. For further strains, these defects grow in the tensile direction and damage affects a larger are a of spherulites. This process, combined with classical amorphous shear mec hanisms, prevails in PVDF deformation as crystallite fragmentation remains of minor importance, for axial strains of up to 30%. (C) 2000 Elsevier Scie nce Ltd. All rights reserved.