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首页> 外文期刊>Polymer Composites >Modulation in polymer properties in PVDF/BCZT composites with ceramic content and their energy density capabilities
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Modulation in polymer properties in PVDF/BCZT composites with ceramic content and their energy density capabilities

机译：具有陶瓷含量的PVDF / BCZT复合材料中的聚合物性能及其能量密度能力的调节

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摘要

The lead-free 0.5((Ba0.7Ca0.3)TiO3)-0.5(Ba(Zr0.2Ti0.8))O-3(BCZT) piezoceramics were synthesized using sol-gel method. The Rietveld analysis of X-ray diffraction (XRD) data and differential scanning calorimetry (DSC) studies of as-synthesized BCZT powder suggests the co-existence of ferroelectric orthorhombic (O) and tetragonal (T) phases at room temperature (RT). The value of curie temperature (TT-C) as depicted from DSC and dielectric studies was found to be approximate to 110 degrees C. The BCZT ceramic particles were dispersed in the polyvinylidene fluoride (PVDF) matrix, an electroactive polymer with great ferro/piezoelectric response in its distinct beta and gamma phases, to form ferroelectric ceramic-polymer composites for their applications in flexible energy storage capacitors. The present work reports the Fourier-transform infrared spectroscopy (FTIR), XRD, dielectric, ferroelectric, and energy density properties of PVDF/BCZT composite films having different wt% of BCZT content fabricated by the solution-cast technique. The FTIR and XRD studies depict the gamma-PVDF and pure BCZT phases in composite films. The dielectric studies estimated the relative permittivity (epsilon(r)) of a composite film with 50 wt% of BCZT content to be approximate to 31 (at 120 Hz) which was about three times as compared with that of pure PVDF. The dielectric loss (tan delta) was maximum approximate to 0.15 (at 120 Hz) for 50 wt% BCZT composition. The ferroelectric studies and energy storage calculations showed that the value of remnant polarization (P-r), coercive field (E-c) and energy storage density (W) attain the maximum value of 0.63 mu C/cm(2), 35.22 kV/cm, and 70.46 mJ/cm(3), respectively for the film sample having 40 wt% BCZT content. The maximum energy storage efficiency,eta(%) is calculated to be approximate to 60 for 50 wt% BCZT composition. The results indicated that the incorporation of BCZT particles in the PVDF matrix improved the overall polarization (polar and interfacial) which enhance the electric properties of composite films. The ferroelectric studies with temperature revealed the PVDF/BCZT composition-dependent polymer or ceramic dominance in the behavior of composite films. With the maximum value of relative permittivity (epsilon(r)) and energy storage efficiency (eta), the PVDF/BCZT composition with 50 wt% of BCZT content has been optimized for applications in flexible energy storage capacitors.
机译：采用溶胶-凝胶法合成了无铅0.5（（Ba0.7Ca0.3）TiO3）-0.5（Ba（Zr0.2Ti0.8））O-3（BCZT）压电陶瓷。对合成BCZT粉末的X射线衍射（XRD）数据和差示扫描量热（DSC）研究的Rietveld分析表明，在室温（RT）下，铁电正交（O）和四方（T）相共存。DSC和介电研究显示的居里温度（TT-C）值约为110℃。BCZT陶瓷颗粒分散在聚偏氟乙烯（PVDF）基体中，这是一种电活性聚合物，在其不同的β相和γ相中具有巨大的铁/压电响应，制备铁电陶瓷-聚合物复合材料，用于柔性储能电容器。本文报道了用溶液浇铸技术制备的具有不同BCZT含量的PVDF/BCZT复合薄膜的傅里叶变换红外光谱（FTIR）、XRD、介电、铁电和能量密度特性。FTIR和XRD研究描述了复合薄膜中的γ-PVDF和纯BCZT相。介电研究估计，BCZT含量为50 wt%的复合膜的相对介电常数（ε（r））约为31（在120 Hz时），这大约是纯PVDF的三倍。对于50 wt%BCZT成分，介电损耗（tanδ）最大约为0.15（在120 Hz时）。铁电研究和储能计算表明，对于BCZT含量为40 wt%的薄膜样品，残余极化（P-r）、矫顽场（E-c）和储能密度（W）的最大值分别为0.63μc/cm（2）、35.22 kV/cm和70.46 mJ/cm（3）。对于50 wt%BCZT成分，计算得出最大储能效率eta（%）约为60。结果表明，在PVDF基体中加入BCZT粒子可以改善复合膜的整体极化（极性极化和界面极化），从而提高复合膜的电性能。随温度变化的铁电研究表明，PVDF/BCZT复合薄膜的行为主要取决于聚合物或陶瓷的成分。随着相对介电常数（ε（r））和储能效率（eta）的最大值，BCZT含量为50 wt%的PVDF/BCZT组合物已被优化用于柔性储能电容器。

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