Zhang Tong, Han Bao-Jun, Yu Juan, Wang Xiao-Dong, Huang Pei
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University Nanjing 210009 P. R. China
RSC Adv. 2018 May 8;8(30):16696-16702. doi: 10.1039/c8ra01989d. eCollection 2018 May 3.
Electrode materials used in supercapacitors must have a high dielectric constant and a low dielectric loss along with good mechanical properties. In this study, the dielectric constant of polyimide (PI) was improved by preparing a PI/SiO@TiC composite. A homogeneous dispersion of SiO@TiC nanoparticles was obtained by the hydrolyzation of tetraethyl orthosilicate, which resulted in the formation of a thin layer of SiO on TiC particles. Polyamic acid was doped with the modified SiO@TiC nanoparticles by mechanical blending to synthesize the PI/SiO@TiC composite, and its dielectric properties were investigated. Scanning electron microscopy studies confirmed that the SiO@TiC particles were homogeneously dispersed in the PI matrix and did not exhibit agglomeration. An increase in the SiO@TiC filler content increased the dielectric constant and the dielectric loss of the composite, but decreased its breakdown strength and deteriorated its mechanical properties. Thus, the addition of SiO@TiC particles to PI is suitable for improving its dielectric properties while maintaining its flexibility.
超级电容器中使用的电极材料必须具有高介电常数、低介电损耗以及良好的机械性能。在本研究中，通过制备聚酰亚胺（PI）/SiO@TiC复合材料来提高PI的介电常数。通过原硅酸四乙酯的水解获得了SiO@TiC纳米颗粒的均匀分散体，这导致在TiC颗粒上形成了一层薄的SiO。通过机械共混将聚酰胺酸与改性的SiO@TiC纳米颗粒掺杂，以合成PI/SiO@TiC复合材料，并对其介电性能进行了研究。扫描电子显微镜研究证实，SiO@TiC颗粒均匀分散在PI基体中，未出现团聚现象。SiO@TiC填料含量的增加提高了复合材料的介电常数和介电损耗，但降低了其击穿强度并使其机械性能变差。因此，向PI中添加SiO@TiC颗粒适合在保持其柔韧性的同时改善其介电性能。
