摘要
采用溶胶凝胶法,以聚环氧乙烷-聚环氧丙烷-聚环氧乙烷三嵌段共聚物(P123)为模板剂,经80℃反应制备了BaTiO_3溶胶,向溶胶中加入100 nm实心BaTiO_3得到多孔BaTiO_3前驱体,经550℃煅烧得到多孔BaTiO_3,用偶联剂改性多孔BaTiO_3;用溶液浇铸法制备BaTiO_3/PVDF复合材料。采用TEM、氮吸附比表面测试仪、精密阻抗分析仪和超高压耐压测试仪表征粉体形貌及复合材料性能。实验结果表明:多孔BaTiO_3颗粒直径为120 nm,比表面积41 m2·g-1,当多孔BaTiO_3添加量15vol%时,复合材料介电常数达到20.7,场强达到270 k V/mm,该复合材料在高储能电容器材料具有应用潜力。
Meso-structure BaTiO_3 precursor was directly synthesized by sol-gel method at 80 ℃ with neutral block copolymer P123 as the soft surfactant,then the precursor of BaTiO_3 gel was treated under550 ℃,finally,porous BaTiO_3 powders was achieved and BaTiO_3 surface were modified by titanate coupling agent. BaTiO_3/ PVDF composites were made via casting solution method. The microstructure of the particles was investigated by a transmission electron microscopy( TEM) and the specific surface area was calculated by Brunauer-Emmett-Teller( BET) method. The dielectric properties were measured by impedance analyzer at room temperature. The electric breakdown strength was tested by a dielectric withstand voltage test. The results show that,the size of porous BaTiO_3 is 120 nm,and the BET specific surface areas is 41 m2· g^(- 1); when the volume fraction of porous BaTiO_3 is 15vol%,the dielectric constant of porous BaTiO_3/ PVDF composites is 20. 7 and the breakdown strength is 270 k V / mm,which has the potential in high energy density materials.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2015年第11期3035-3039,共5页
Journal of Synthetic Crystals
基金
国家自然科学基金(51372014)
