We present a comparative study of proton dynamics in unpoled non-ferroelectric polymer polyvinylidene fluoride ( PVDF) and in its trifluoroethylene containing ferroelectric copolymer (with 70/30 molar proportion), using quasi-elastic neutron scattering. O., E-mail: E-mail: E-mail: [Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
[Biology and Soft-Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States) Diallo, S. Jalarvo, N., E-mail: E-mail: E-mail: [Jülich Centre for Neutron Science, Forschungszentrum Jülich GmbH, 52428 Jülich (Germany) Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States) Pramanick, A., E-mail: E-mail: E-mail: [Department of Physics and Materials Science, City University of Hong Kong, Kowloon (Hong Kong) Do, C. Calorimetric data revealed aĮffects of configurational changes on molecular dynamics in polyvinylidene fluoride and poly(vinylidene fluoride-trifluoroethylene) ferroelectric polymersĮnergy Technology Data Exchange (ETDEWEB) The investigation revealed a linear correlation between the gamma dose and peak intensity at 274 nm for gamma doses ranging from 0.1 to more than 750 KGy, with a huge extension of the original usable dose range. Particularly, this study is focused in the optical absorption peak at 274 nm, corresponding to the radio-induction of triplets of conjugated C=C double bonds. Now, in the present work, we extended the investigation to gamma doses up to 3 MGy. Simultaneously, the absorption peak at 274 nm can be used for doses ranging from 1 to 100 kGy. The absorption peak at 223 nm is the most sensitive to gamma rays and can be used for detecting gamma doses ranging from 0.3 to 75 kGy. In a first investigation for doses ranging from 0.1 to 100 kGy we found out a linear relation between the gamma radiation dose and the absorption peak intensities in the UV region of the spectrum, i.e., at 223 and 274 nm. These studies have lead us to investigate the possible use of these copolymers as high dose dosemeters, once the reported amount of induced C=C conjugated bonds after X-ray, UV and gamma irradiation seems to be a function of the delivered radiation dose. %, the copolymer can have its ferroelectric properties modified by high doses of ionizing radiation, with the appearing of radio-induced relaxor ferroelectric features. Recent research work around the world have demonstrated that, for TrFE contents ranging from with 30 to 50 wt. %, have long been studied for their striking ferroelectric properties and their applications in actuators, transducers and ferroelectric memory. PVDF, and also its copolymers with TrFE contents ranging from 18 to 63 wt. The Poly(vinylidene fluoride-trifluoroethylene) is a copolymer which is obtained with the random introduction of fluorinated CHF-CF 2 monomers in the PVDF main chain. Poly(vinylidene fluoride) is a semicrystalline linear homopolymer composed by the repetition of CH 2 - CF 2 monomers. International Nuclear Information System (INIS) Linear optical absorption response of poly(vinylidene fluoride - trifluoroethylene) copolymers to high gamma dose
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