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Crystallization kinetics and phase transformation of poly(vinylidene fluoride) films incorporated with functionalized baTiO3 nanoparticles

Authors

  • Hui-Jian Ye,

    1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
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  • Wen-Zhu Shao,

    1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
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  • Liang Zhen

    Corresponding author
    1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
    2. MOE Key Laboratory of Micro-system and Micro-structures Manufacturing, Harbin Institute of Technology, Harbin 150080, People's Republic of China
    • School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
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Abstract

The transformation of α to β-phase in poly(vinylidene fluoride) (PVDF) induced by the addition of tetradecylphosphonic acid (TDPA)-BaTiO3 nanoparticles and subsequently the isothermal crystallization kinetics of pristine PVDF and its nanocomposites have been investigated. The result of infrared spectra showed that the relative crystalline fraction of β-phase was enhanced greatly after the introduction of TDPA–BaTiO3 nanoparticles, and reached the peak of 93% when the concentration of nanofillers was 20%. The interaction between TDPA–BaTiO3 nanoparticles and PVDF macromolecular chains induced the change of conformation from trans-gauche to all-trans crystal structure in PVDF segment. The isothermal crystallization of TDPA–BaTiO3/PVDF nanocomposites was carried out by the differential scanning calorimetry (DSC). The influence of TDPA–BaTiO3 nanoparticles concentration on crystallization rate, activate energy, melting enthalpy, and peak temperature were studied. The nanocomposite film loaded 20% TDPA–BaTiO3 nanoparticles exhibited the highest crystallization rate and activate energy, which decreased after loading more nanofillers in the host because of high volume fraction of nanoparticles leading to steric hindrance and further weakening the mobility of PVDF chains during the crystallization. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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