夹层结构P(VDF-HFP)/BN纳米复合材料的介电性能  

Dielectric Properties of P(VDF-HFP)/BN Nanocomposite with Interlayer Structure

作　　者：刘亚楠 陈杰 江平开[1] 黄兴溢[1] LIU Yanan;CHEN Jie;JIANG Pingkai;HUANG Xingyi(Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学上海市电气绝缘与热老化重点实验室,上海200240

出　　处：《绝缘材料》2020年第11期12-20,共9页Insulating Materials

基　　金：国家自然科学基金资助项目(51877132)。

摘　　要：含有纳米填料的聚合物复合材料常因填料团聚,出现泄漏电流增大和击穿强度降低等问题,不利于储能密度和储能效率的提升。为了克服这一系列问题,本文制备了改性氮化硼纳米片为夹层的P(VDF-HFP)复合膜,首先向液相剥离得到的氮化硼纳米片(BNNSs)表面引入高偶极矩的硫脲基团,然后用逐层溶液流延的工艺制备了夹层结构的P(VDF-HFP)复合膜,并对其表面形貌、介电性能、储能性能进行表征和测试。结果表明:当夹层的氮化硼纳米片浓度为0.8 mg/mL时,其电气强度从472.37 MV/m提升至529.13 MV/m,泄漏电流从1.16×10^-6 A/cm^2降至3.7×10^-8 A/cm^2,放电能量密度高达5.63 J/cm3,在350 MV/m下储能效率比纯P(VDF-HFP)提升了4.5%,介电储能性质明显改善。Polymer composites containing nano-fillers often suffer from the problems of the increase of leakage current and the decrease of breakdown strength due to the agglomeration of fillers,which is not beneficial to the improvement of energy storage density and efficiency.To overcome these problems,we prepared a P(VDF-HFP)composite film with modified boron nitride nanosheets as interlayer.Firstly,thiourea groups with high dipole moment were introduced to the surface of boron nitride nanosheets(BNNSs)obtained by liquid exfoliation,and then the P(VDF-HFP)composite film with the interlayer structure was prepared by layer-by-layer solution casting process,and their surface morphology,dielectrical properties,and energy storage properties were characterized and tested.The results show that when the concentration of BNNSs in the interlayer is 0.8 mg/mL,the breakdown strength of the composite film increases from 472.37 MV/m to 529.13 MV/m,the leakage current decreases from 1.16×10^-6 A/cm^2 to 3.7×10^-8 A/cm^2,the discharge energy density reaches 5.63 J/cm^3 in maximum,its energy storage efficiency is 4.5%higher than that of pure P(VDF-HFP),and the dielectric energy storage properties were improved significantly.

关 键 词：氮化硼 聚偏氟乙烯-六氟丙烯共聚物 储能性质 夹层结构 

分 类 号：TM215[一般工业技术—材料科学与工程]