摘要
通过溶胶凝胶—燃烧法制备CaCu_3Ti_4O_(12)(CCTO)微米颗粒,并通过溶液涂覆法制备CCTO/PVDF微米复合材料。利用XRD和DSC对CCTO/PVDF复合薄膜样本进行物相分析和热分析,研究CCTO添加剂对PVDF材料的微结构与介电性能的影响。XRD分析表明,CCTO微米颗粒破坏PVDF的分子链结构,从而形成CCTO和PVDF两相复合体系,且CCTO相结构保持良好。DSC分析表明,CCTO微米颗粒略提高PVDF的熔融温度(166. 2℃)而降低其结晶程度。介电谱测试结果表明,CCTO微米颗粒显著增强PVDF的介电常数。CCTO/PVDF-15vol.%复合材料的介电常数为13. 5(100Hz),是纯PVDF的1. 69倍,并且保持较低的介电损耗(0. 04)和电导率(3. 01×10-11S/cm)。
引文
[1]顾逸韬,刘宏波,马海华,等.电介质储能材料研究进展[J].绝缘材料,2015,48(11):1-13.
[2]王威望,李盛涛,刘文凤.聚合物纳米复合电介质的击穿性能[J].电工技术学报,2017,32(16):25-36.
[3]张玲玲,国世上.铁电高分子PVDF及其共聚物研究进展[J].物理学进展,2016,36(2):35-45.
[4]冯德柱.聚合物结构和性能[M].北京:科技出版社,1995.
[5]YU K,NIU Y J,ZHOU Y C,et al. Nanocomposites of surface-modified BaTiO3nanoparticles filled ferroelectric polymer with enhanced energy density[J]. Journal of the American Ceramic Society,2013,96(8):2519-2524.
[6]ZHANG C,SHI Z C,MAO F,et al. Polymer composites with balanced dielectric constant and loss via constructing trilayer architecture[J]. Journal of Materials Science,2018,53(18):13230-13242.
[7]SINCLAIR D C,ADAMS T B,MORRISON F D,et al. Ca Cu3Ti4O12:one-step internal barrier layer capacitor[J]. Applied Physics Letters,2002,80(12):2153-2155.
[8]高亮,孔德波,刘义成. Zr掺杂对CaCu3Ti4O12陶瓷介电性能的影响[J].大庆师范学院学报,2015,35(3):67-70.
[9]SUBRAMANIAN M A,SLEIGHT A W. ACu3Ti4O12and ACu3Ru4O12perovskites:high dielectric constants and valence degeneracy[J]. Solid State Sciences,2002,4(3):347-351.
[10]赵薇,苑会林,王婧,等. PVDF/PMMA复合材料的微观结构及形态[J].合成树脂及塑料,2008,25(5):55-57.
[11]DANG Z M,ZHOU T,YAO S H,et al. Advanced calcium copper titanate/polyimide functional hybrid films with high dielectric permittivity[J]. Advanced Materials,2009,21(20):2077-2082.
[12]GAO L,WANG X,WANG H C,et al. Improvement of dielectric performance and interfacial polarization of polyvinylidene fluoride composites with Ca Cu3Ti4O12@Ni hybrid nanofibers[J]. Journal of Materials Science:Materials in Electronics,2018,29(12):10600-10613.
[13]MA W,SONG X,ZHANG Y,et al. Effect of lanthanum modification on dielectric relaxation behavior in lead zirconate stanate titanate antiferroelectric ceramics[J]. Journal of Materials Science:Materials in Electronics,2016,27(2):1391-1397.
[14]ZHOU X,ZHAO X,SOU Z,et al. Electrical breakdown and ultrahigh electrical energy density in poly(vinylidene fluoride-hexafluoropropylene)copolymer[J]. Applied Physics Letters,2009,94(16):162901-162903.