Molecular Orientation and Degree of Crystallinity of Piezoelectric Poly(Vinylidene Fluoride) Films Exclusively in the  Phase

Author: Sencadas V.  

Publisher: Taylor & Francis Ltd

ISSN: 0015-0193

Source: Ferroelectrics, Vol.370, Iss.1, 2008-01, pp. : 29-35

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

Oriented  -phase films were obtained by drawing exclusively  -phase films obtained from dimethylformamide solution crystallization at 60 °C with subsequent pressing. Wide angle X-ray diffraction and pole figure plots showed that drawing at 90°C and with R = 4 of originally  -phase films results in exclusively  -phase films with crystallinity degree of 49% and orientation factor of 0.885. For comparison, with the conventional drawing technique from α-phase material, films oriented at a ratio (R) of 5 still contain about 20% of phase α, a crystallinity degree of 40% and  -phase crystallographic c-axis orientation factor of 0.655.