Abstract
The proton spin lattice relaxation times T1 of drawn films of a VDF/TrFE copolymer (VDF 72 mol%) were measured for various values of γ, which was the angle between the magnetic field and the draw direction of the film, and for different Larmor frequencies ω, over a temperature range from −23 to 130°C. Three kinds of T1 relaxation processes were observed below the Curie temperature (Tc), around Tc, and at a certain temperature in the paraelectric phase. The curve of ln T1 against reciprocal temperature 1/T was linear for the relaxation process in the paraelectric phase. The T1 became larger as the frequency ω and the angle γ increased.The formulation of T1 in the paraelectric phase for the oriented copolymer was derived, using the non-exponential correlation function which describes a one dimensional diffusion motion of conformational defects along the chain. The existence of the 1-D diffusion motion of the conformation defect was confirmed by a reasonable agreement between the theoretical and experimental results.
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Ishii, F., Odajima, A. Proton Spin Lattice Relaxation in Vinylidene Fluoride/Trifluoroethylene Copolymer I. Vinylidene Fluoride 72 mol% Copolymer. Polym J 18, 539–546 (1986). https://doi.org/10.1295/polymj.18.539
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DOI: https://doi.org/10.1295/polymj.18.539