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Article Dans Une Revue Applied Physics Letters Année : 2015

β phase instability in poly(vinylidene fluoride/trifluoroethylene) thin films near β relaxation temperature

Résumé

The β phase stability in poly(vinylidene fluoride/trifluoroethylene) [P(VDF-TrFE)] thin films was studied below 300 K using X-ray diffraction and polarization-electric-field (P-E) hysteresis loops measurements. On as-grown samples, an irreversible partial order-disorder transformation at Tβ ∼ 250 K, namely, the β relaxation temperature, was evidenced by the appearance of an additional X-Ray diffraction peak above Tβ as well as changes on the P-E loops on heating after the first cooling. This order-disorder-like transformation which is attributed to an all-trans order to helical disorder transition is suggested to take place in defect-rich regions like crystal-amorphous interphases and/or crystalline areas with randomly distributed TrFE defect-like units.
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Dates et versions

hal-01258698 , version 1 (24-08-2020)

Identifiants

Citer

B.B. Tian, X. F. Bai, Y. Liu, P Gemeiner, X. L. Zhao, et al.. β phase instability in poly(vinylidene fluoride/trifluoroethylene) thin films near β relaxation temperature. Applied Physics Letters, 2015, 106 (106), pp.092902. ⟨10.1063/1.4913968⟩. ⟨hal-01258698⟩
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