Dielectric properties of polyarylate blends |
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| Authors: | T Nagasawa Y Murata K Tadano R Kawai K Ikehara S Yano |
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| Affiliation: | (1) Unitika Ltd., Nihonbashi, Muromachi, Chuo-ku, Tokyo, 103-8321, Japan;(2) Osaka Prefectural College of Technology, Saiwai-cyo, Neyagawa, Osaka, 501-8572, Japan;(3) Gifu College of Medical Technology, Ichihiraga, Seki, Gifu, 501-3892, Japan;(4) Department of Chemistry, Faculty of Engineering, Gifu University, Yanagido, Gifu, 501-1193, Japan;(5) Department of Chemistry, Faculty of Engineering, Gifu University, Yanagido, Gifu, 501-1193, Japan |
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| Abstract: | Dielectric properties and molecular motion were studied by use ofdielectric spectroscopy and differential scanning calorimetry for twoblends, fully transesterificated polyarylate of bisphenol A withterephthalate/isophthalate (50/50) (PA)/polycarbonate of bisphenol A(PC) blends and PA/poly(ethylene terephthalate) (PET) blends. All thequenched PA/PC and PA/PET blends were amorphous and the glasstransition temperature (Tg) was varied with the blends ratioaccording to Gordon-Taylor equation. The PA/PET blends with more than60% of PET crystallized above the crystallization temperature. ThePA/PC and PA/PET blends showed two dielectric relaxations,  above Tg and  below Tg, which are related to a glasstransition and a local motion of short segment, respectively. The relaxation moved to lower temperatures as PC or PET contentincreases, reflecting the lowering Tg faithfully. In the PA/PETblends, the static ( 0) and the limiting dielectricconstant ( ), and the increment ( ) for the relaxation decreases with increasingtemperature and the decrease falled on one curve, independent of theblend ratio. Any ferro- and piezoelectricity were not observed fortwo blends. |
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