A melt-quenched blend of 80wt% poly(vinylidene fluoride) (PVDF) and 20wt% poly(methyl methacrylate) (PMMA) has the fl-crystal form of PVDF, which grows larger on annealing at higher temperature. The internal electric field E i induced by poling in the PVDF/PMMA (80/20) blend was measured using the technique of electrochromic peak shift of dye dissolved in the blend. It was found that E i was of the order of 106 V cm-1 (larger than the poling field), and that Ei was anomalously stable when the sample was annealed at higher temperature, whereas the pyroelectricity decreased above the glass transition temperature. We speculated that the space charge may be related to the anomalous stability of El.
Посилання на статтю:
Measurement of the internal electric field in a poly(vinylidene fluoride)/poly(methyl methacrylate) blend / Naoto Tsutsumi*, Yoshiaki Ueda and Tsuyoshi Kiyotsukuri // Polymer. – 1992. – Vol 33. – P. 3305-3307.