Dielectric relaxation dynamics in poly(vinylidene fluoride)/Pb(Zr0.53Ti0.47)O3 composites

POLYMER

卷:204

Article

Costa, C. M.¹  Sabater i Serra, R.^2,3  Balado, A. Andrio⁴  Ribelles, J. L. Gomez^2,3  Lanceros-Mendez, S.^5,6 

[1] Univ Minho, Ctr Fis, Campus Gualtar, P-4710058 Braga, Portugal

[2] Univ Politecn Valencia, CBIT, Ctr Biomat & Tissue Engn, Valencia 46022, Spain

[3] Biomed Res Networking Ctr Bioengn Biomat & Nanome, Valencia, Spain

[4] Univ Jaime I, Dept Fis, Castellon de La Plana 12071, Spain

[5] UPV EHU Sci Pk, Basque Ctr Mat Applicat & Nanostruct, BCMat, Leioa 48940, Spain

[6] Ikerbasque, Basque Fdn Sci, Bilbao 48013, Spain

关键词: Composites;    Dielectric analysis;    PVDF;    PZT;    Smart materials;   

DOI  :  10.1016/j.polymer.2020.122811

来源: Elsevier

【 摘 要 】

Polymer-ceramic composites based on poly(vinylidene fluoride) and ceramic particles of the inorganic piezoelectric material Pb(Zr0.53Ti0.47)O-3 were prepared with different particle concentrations and size by solution casting in the non-polar (alpha- ) and polar (beta-) phases of the polymer. The influence of amount and particle size on the overall dielectric response of alpha and beta-phase matrix composites was analyzed, focusing on the dielectric relaxation processes. The cooperative segmental motions within the PVDF amorphous phase (low-temperature beta-relaxation), are strongly affected by the inclusion of the fillers, both in the alpha and beta-phase matrix composites. The complex permittivity analyzed by the Havriliak-Negami equation model (NH) and the fragility parameter indicates that the PZT ceramic filler induces heterogeneity in the polymer matrix. For alpha-PVDF/PZT composites, the strength of the relaxation process increases with increasing the filler amount and it is nearly independent on particle size. The behavior of the HN shape parameters, more noticeable for filler content of 20% or higher, shows that the relaxation dynamics is influenced by the polymer nucleation kinetics. PVDF/PZT composites in beta-phase matrix exhibit a strong increase in the relaxation strength for PVDF/PZT composites with 40% of ceramic fillers, and the process becomes more symmetric when the amount of filler increases. The detected variations in the relaxation dynamics in both alpha and beta-phase matrix composites is strongly affected by the ceramic filler and the interface between the ceramic microparticles and the polymer.

【 授权许可】

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