Abstract
In the proton spin lattice relaxation time T1 measurements on VDF/TrFE copolymers with the VDF contents of 52 and 65 mol%, three kinds of spin lattice relaxation processes were observed below the Curie temperature Tc, around Tc and in a certain temperature region above Tc. They were compared with those of P(VDF72/TrFE28) The thermal hysteresis of T1 against temperature for each relaxation process became smaller in order of the VDF contents of 72, 65, and 52 mol%.The T1 in the paraelectric phase for each copolymer was analyzed, on the basis of Bloembergen’s theory, in terms of the non-exponential correlation function which describes a one-dimensional diffusion motion of conformational defects along the chain. The activation energy of the 1-D diffusion motion was about 8.5 kcal mol−1 which did not depend on the VDF content. The 1/T1 and the correlation time of the 1-D diffusion motion for each copolymer were converted, respectively, to those of P(VDF72/TrFE28) with the scaling factors of ξ−2 and ξ−4, in which the ξ is the ratio of the VDF content (mol%) to 72 mol%.
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Ishii, F., Odajima, A. Proton Spin Lattice Relaxation in Vinylidene Fluoride/Trifluoroethylene Copolymers II. Effects of Vinylidene Fluoride Content upon Spin Relaxation Processes. Polym J 18, 547–555 (1986). https://doi.org/10.1295/polymj.18.547
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DOI: https://doi.org/10.1295/polymj.18.547