Thermal study on structural changes and phase transition in high-energy electron-irradiated blends of P(VDF–TrFE) copolymers |
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Authors: | S S Guo C L Sun T S Wu X Z Zhao Helen L W Chan |
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Affiliation: | (1) Department of Physics, Wuhan University, Wuhan, Hubei, 430072, China;(2) Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China |
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Abstract: | Thermal study of high-energy electron-irradiation binary blends of ferroelectric P(VDF–TrFE) copolymers has been investigated
by X-ray diffraction, differential scanning calorimetry (DSC) and thermally stimulated depolarization current (TSDC). X-ray
diffraction shows some degree of mixing inside a crystal lattice due to significant changes in the ferroelectric-to-paraelectric
phase transition behavior from all-trans to trans-gauche conformation in nanometer range after irradiation. In DSC thermograms,
it is found that both the Curie temperature and melting temperature decrease with the dose and that the F–P transition temperatures
and enthalpies of two individual copolymers and the blend merge into one with the increase of dose, indicating that there
exists a strong lattice coupling between the two copolymers. The peaks observed in TSDC spectra of the blends exhibit the
phase transitional characters of the parent copolymers which demonstrates that the miscibility in the crystalline region for
their large compositional discrepancy. The distribution of temperature peaks in TSDC also show that the existence of two types
of crystallite in the blend which become more clear after irradiation, confirming the X-ray and DSC results. |
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