Abstract
AbstractThe oriented superstructure of poly(vinylidene fluoride) is controlled by using a forced‐quenching type of zone drawing apparatus. Systematic variation of the weight fraction χ(I) of form‐I crystals and the orientation function fa of amorphous chains shows that the piezoelectricity increases with increasing χ(I) and fa. A change in the state of molecular aggregation during poling is also effective in increasing the piezoelectricity and the orientation of the crystal b axis along the poling direction. Equations relating piezoelectricity to the form‐I crystallinity, the orientation of amorphous chains, and the orientation of the crystal b axis along the poling direction are derived. These are based on a mechanical model having regions of taut tie molecules in parallel with composite regions consisting of crystalline and amorphous blocks in series.
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More From: Journal of Polymer Science: Polymer Physics Edition
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