کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5489018 1399594 2017 28 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Investigation on crystalline structure and dielectric relaxation behaviors of hot pressed poly(vinylidene fluoride) film
ترجمه فارسی عنوان
بررسی ساختار بلوری و رفتارهای آرامبخشی دی الکتریک فیلم فشرده پلی وینیلیدین فلوراید
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
چکیده انگلیسی
The dielectric relaxation behaviors of hot pressed poly(vinylidene fluoride) (PVDF) film have been studied using dielectric spectroscopy in the frequency domain from 20 Hz to 5 MHz at temperatures between 20 °C and 200 °C. Crystalline/amorphous interphase is suggested with methods of FTIR, XRD, and DSC. Frequency and temperature dependence of dielectric spectroscopy reveals the relaxation behavior and structural dynamics of the samples, and three types of relaxation processes are suggested, αAc relaxation process contributed by the hopping transport process near the periphery of conduction band or valence zones at Fermi energy, αc relaxation process related to the structure change of crystal lattice trapped dipoles in crystalline regions, and αa relaxation process arising from segmental dipole rearrangement of interphases in amorphous regions. Cole-Cole and Havriliak-Negami experimental equations were utilized to analyze these relaxation processes, and differences of Arrhenius parameters for αAc and αc relaxation processes obtained from Cole-Cole and Havriliak-Negami equations were discussed in detail. Activity energy of different relaxation processes obtained from Arrhenius equation and VFT equation indicates non-single thermal activation mechanism for hot pressed PVDF film.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Current Applied Physics - Volume 17, Issue 1, January 2017, Pages 15-23
نویسندگان
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