摘要
将高介电常数的陶瓷作为填料加入聚合物中,是提高聚合物介电常数的主要途径之一。为了降低陶瓷添加量,用静电纺丝法制了Pb_(0.98)La_(0.02)(Zr_(0.95)Ti_(0.05))O_3(PLZT)一维纳米纤维,并对其进行多巴胺表面改性,添加到高介电常数的聚偏氟乙烯(PVDF)基体中,形成1-3型复合材料(Dopa@PLZTs-PVDF)。SEM结果显示复合材料内部较均匀,无明显孔洞。该体系在较低填料含量(体积分数8.6%)时相对介电常数可达14,比PVDF基体(8.5)提高65%,同时介电损耗略微降低,有助于保持柔性和降低成本。该体系的击穿场强下降较快,体积分数1.7%样品的储能密度最大(0.4 J/cm^3),比PVDF基体(0.34 J/cm^3)提高了10%。
Generally, ceramic materials with high dielectric constant are added into polymer matrix to improve the dielectric properties of composites. One-dimensional PLZT nanofibers, prepared by electrospirming and then coated by dopamine, were added into PVDF matrix, forming 1-3 type composites （Dopa@PLZTs-PVDF）. The SEM results show a good combination of PLZTs and PVDF matrix. The relative dielectric constant is 14 at 100 Hz for 8.6% （volume fraction） samples, 65% higher than that of PVDF matrix. The maximal energy density is 0.4 J/cm3 for 1.7% （volume fraction） samples, 10% higher than that of PVDF matrix. Proper content of PLZTs contributes to composite flexibility and cost reduction. The results demonstrate that one-dimensional ceramic fillers with low content, can enhance the dielectric constant of composites obviously.
作者
郑斌
宋宇
赵祖珍
ZHENG Bin SONG Yu ZHAO Zuzhen(Advanced Energy Storage Materials ＆ Devices Laboratory, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, China)
出处
《电子元件与材料》
CAS
CSCD
2017年第2期14-18,24,共6页
Electronic Components And Materials
基金
深圳市战略性新兴产业发展专项资金资助(No.JCYJ201304011740004
No.JSGG20150331155519130
No.CXZZ20150402104253189)
关键词
高介电
储能密度
复合材料
纳米纤维
表面改性
静电纺丝
high dielectric constant
energy density
composite
nanofiber
surface modification
electrospinning
