摘要
采用先驱体合成法得到PST-PT陶瓷粉体,X射线衍射测试结果显示粉体为纯四方钙钛矿结构。SEM分析表明,其颗粒大小比较均匀,粒度约为500nm。采用模压/固化工艺,制备了PST-PT/PVDF0-3型复合材料。测试了PST-PT/PVDF0-3型复合材料的介电性质,测试结果显示,其介电常数强烈地依赖于两相的相对比例、测试温度和测试频率。当PST-PT含量(质量分数)为9%时,复合材料介电常数大幅度提高,在40℃～60℃左右有一个极值峰出现。
By use of compression modeling/sintering technique, a series of PST-PT/PVDF composites of different constitutions were prepared using a self-made model. SEM results show that the PST-PT ceramic particles dispersed equally in polymer. Dielectric properties of composites containing PST-PT dispersed in PVDF matrix having 0-3 connectivity were measured. The results indicate that the dielectric constant was strongly influenced by the relative proportions of the two constituents, temperature and frequency. The dielectric constant in the ferroelectric phase of PST-PT plays an important role in controlling the effective dielectric constant of the PST-PT/PVDF composites, especially for the composite containing 9% (mass fraction) PST-PT. Different from other samples, it is remarkable that the addition of 9% PST-PT to PVDF results in the appearance of a large peak of dielectric constant near 60°C.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2004年第3期69-72,共4页
Acta Materiae Compositae Sinica
基金
国家自然科学基金资助(S0232030)
