摘要
以聚偏氟乙烯-三氟氯乙烯(P(VDF-CTFE))为原料,经过消去反应脱除氯化氢,得到含有分子内双键的P(VDF-CTFE-DB)。选择高介电的钐掺杂铌镁酸铅-钛酸铅(PMN-PT-Sm)铁电陶瓷作为复合相,以可交联的P(VDF-CTFE-DB)作为聚合物基体,通过自由基反应形成交联型P(VDF-CTFE-DB)/PMN-PT-Sm纳米复合薄膜。研究了不同掺杂量的PMN-PT-Sm和交联结构对P(VDF-CTFE-DB)/PMN-PT-Sm纳米复合薄膜介电、储能及漏电流性能的影响。结果表明,当掺杂30%(体积分数,下同)的PMN-PT-Sm时,纳米复合薄膜在100 Hz时的介电常数最大为65。当掺杂20%的PMN-PT-Sm时,纳米复合薄膜的击穿电场为3200 kV/cm,储能密度达到最大值,为9.7 J/cm 3。交联结构的引入显著提高了纳米复合薄膜的击穿电场,有效降低了纳米复合薄膜的漏电流、介电损耗以及提高了纳米复合薄膜的储能密度。此外,这种交联结构能赋予纳米复合薄膜优良的耐溶剂性能。
Afluoropolymer with double bonds(P(VDF-CTFE-DB))was synthesized via controlled dehydrochlorination of poly(vinylidene fluoride-co-chlorotrifluoroethylene)(P(VDF-co-CTFE)).High permittivity component of samarium-doped Pb(Mg 1/3 Nb 2/3)O 3-PbTiO 3(PMN-PT-Sm)ferroelectric was selected as the inorganic composite phase,and the cross-linkable P(VDF-CTFE-DB)was used as polymer matrix.Cross-linking P(VDF-CTFE-DB)/PMN-PT-Sm composite film was synthesized by reacting the free radical initiator.The dielectric properties,breakdown strength,energy-storage performances,and solvent resistance of the P(VDF-CTFE-DB)/PMN-PT-Sm nanocomposite films were investigated.As a result,the dielectric constant increases with increasing the volume fraction of PMN-PT-Sm nanoparticles.A maximal dielectric constant of 65 at 100 Hz associated with a dielectric loss of only about 0.058 was obtained in the P(VDF-CTFE-DB)/PMN-PT-Sm nanocomposite film with 30%of PMN-PT-Sm nanoparticle addition.It is experimentally found that the cross-linked network structure has a great influence on the breakdown strength,energy storage performances and compatibility of P(VDF-CTFE-DB)/PMN-PT-Sm nanocomposite films.The significantly improved breakdown strength up to 3200 kV/cm and the highest discharge energy density of about 9.7 J/cm 3 for the cross-linking P(VDF-CTFE-DB)/PMN-PT-Sm nanocomposite film with 20%of PMN-PT-Sm have been achieved.Constructing cross-linked networks among P(VDF-CTFE-DB)and PMN-PT-Sm nanoparticles could be an effective way to decrease the leakage current and dielectric loss,as well as to enhance the breakdown strength and the energy storage performances in the polymer nanocomposites.
作者
何亭睿
王一平
李雄杰
陈朋
胡悫睿
杨颖
宁洪龙
HE Tingrui;WANG Yiping;LI Xiongjie;CHEN Peng;HU Querui;YANG Ying;NING Honglong(State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;State Key Laboratory of Luminescent Materials and Devices,Institute of Polymer Optoelectronic Materials and Devices,School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第18期18152-18158,共7页
Materials Reports
基金
国家自然科学基金(11274174,51790492)
111项目(B12021)。
关键词
氟聚物
交联结构
介电储能
铁电陶瓷
纳米复合薄膜
fluoropolymer
crosslink structure
dielectric energy storage
ferroelectric ceramic
nano composite film
