Ou Jinfa, Chen Yonghui, Zhao Jiafu, Luo Shaojuan, Wong Ka Wai, Ng Ka Ming
School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China.
International Collaborative Laboratory of 2D Materials for Optoelectronic Science and Technology, Shenzhen University, Shenzhen 518060, China.
Polymers (Basel). 2022 Oct 14;14(20):4328. doi: 10.3390/polym14204328.
A novel calcium copper titanate (CaCuTiO)-polyvinylidene fluoride composite (CCTO@PVDF) with Cu-deficiency was successfully prepared through the molten salt-assisted method. The morphology and structure of polymer composites uniformly incorporated with CCTO nanocrystals were characterized. At the same volume fraction, the CCTOs with Cu-deficiency displayed higher dielectric constants than those without post-treatment. A relatively high dielectric constant of 939 was obtained at 64% vol% CCTO@PVDF content, 78 times that of pure PVDF. The high dielectric constants of these composites were attributed to the homogeneous dispersion and interfacial polarization of the CCTO into the PVDF matrix. These composites also have prospective applications in high-frequency regions (10 Hz). The enhancement of the dielectric constant was predicted in several theoretical models, among which the EMT and Yamada models agreed well with the experimental results, indicating the excellent distribution in the polymer matrix.
通过熔盐辅助法成功制备了一种具有铜缺陷的新型钛酸钙铜（CaCuTiO）-聚偏氟乙烯复合材料（CCTO@PVDF）。对均匀掺入CCTO纳米晶体的聚合物复合材料的形态和结构进行了表征。在相同体积分数下，具有铜缺陷的CCTO比未经后处理的CCTO表现出更高的介电常数。在CCTO@PVDF含量为64%（体积）时，获得了相对较高的介电常数939，是纯PVDF的78倍。这些复合材料的高介电常数归因于CCTO在PVDF基体中的均匀分散和界面极化。这些复合材料在高频区域（10 Hz）也具有潜在应用。在几种理论模型中预测了介电常数的增强，其中EMT模型和山田模型与实验结果吻合良好，表明在聚合物基体中分布优异。
