期刊
POLYMER
卷 100, 期 -, 页码 69-76出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2016.08.017
关键词
PVDF-TrFE; Oriented; Ferroelectric properties
资金
- China Scholarship Council (CSC) [201306630008]
- Sunchon National University, South Korea, through the BK21+ programme
Highly aligned poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) films were processed using a scalable one-step melt extrusion processing route. Crystalline structure and orientation were optimized by controlling the melt extrusion conditions. XRD patterns suggested the nearly perfect alignment of the c-axis (polymer chain direction) along the extrusion direction in the optimized as-extruded films. SEM analysis confirmed the morphology of the crystalline phase, showing edge-on lamellae stacked perpendicular to the extrusion direction. DSC data indicated high crystallinity and well-ordered ferroelectric structure of the extruded films. The FTIR spectroscopy proved strong intermolecular dipole dipole interaction in the extruded films. Accordingly, the optimized as-extruded PVDF-TrFE films exhibit a coercive field of 24 kV/mm, half of the commonly reported values for bulk films (similar to 50 kV/mm) and a remnant polarization of 0.078 C/m(2) which further increased to 0.099 C/m(2) after annealing. This value is close to the theoretical limit (0.102 C/m(2)) assuming perfect in-plane c-axis orientation and 100% crystallinity. (C) 2016 Elsevier Ltd. All rights reserved.
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