Rescaled temperature dependence of dielectric behavior of ferroelectric polymer composites
Rescaled temperature dependence of dielectric behavior of ferroelectric polymer composites
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DOI：
10.1063/1.1920408
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发表时间：
2005-04-25
影响因子：
4
通讯作者：
Tjong, SC
中科院分区：
文献类型：
--
作者：
Dang, ZM;Wang, L;Tjong, SC
研究了岩盐型锂钛共掺NiO(LTNO)电活性陶瓷颗粒填充的聚偏氟乙烯(PVDF)铁电材料的介电行为随温度的变化规律。含LTNO的柔性PVDF-LTNO复合材料在体积函数为0.3时的介电行为在较宽的温度范围内(290-360K)的介电常数约为50，且在10(3)~10(6)Hz范围内与频率无关。复合材料的介电响应与纯PVDF基聚合物的介电响应基本一致。结果表明，尽管由于引入了高介电常数的岩盐型LTNO陶瓷颗粒，复合材料的介电常数较高，但聚合物的玻璃化转变以及与主链上的极性基团的广角振荡有关的介电松弛决定了复合材料的介电行为。(C)2005年美国物理研究所。
Rescaled temperature dependence of dielectric behavior of ferroelectric polyvinylidene fluoride (PVDF) filled with electroactive ceramic particles of rocksalt-type Li and Ti codoped NiO (LTNO) was studied at wide frequency ranges. Dielectric behavior of the flexible PVDF-LTNO composites with LTNO filler at the volumetric function of 0.3 exhibits a dielectric constant value, epsilon approximate to 50 at broad temperature range (290-360 K), and the value is frequency independent from 10(3) to 10(6) Hz. The dielectric response of the composite is almost in accordance to that of pure PVDF matrix polymer. It was found that though the dielectric constant value of the composites is high due to an introduction of the rock salt-type LTNO ceramic particles with high dielectric constant, the glass transition of the polymer and dielectric relaxation related to the wide-angle oscillation of polar groups attached to the main polymer chain determine the dielectric behavior of the composite. (c) 2005 American Institute of Physics.