用于电卡制冷的聚(偏氟乙烯-三氟乙烯)(55/45)/0.75BiFeO_(3)-0.25BaTiO_(3)复合材料的制备及热导率增强  

Preparation and enhanced thermal conductivity of poly(vinylidene fluoride-trifluoroethylene)(55/45)/0.75BiFeO_(3)-0.25BaTiO_(3) composite for electrocaloric application

作　　者：朱余红 初宝进[1] ZHU Yu‑Hong;CHU Bao‑Jin(CAS Key Laboratory of Materials for Energy Conversion,Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学技术大学材料科学与工程系,中国科学院能量转换材料重点实验室,合肥230026

出　　处：《无机化学学报》2023年第4期716-722,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家重点研发计划(No.2020YFA0711502,2017YFA0701301)资助。

摘　　要：以聚(偏氟乙烯-三氟乙烯)(55/45)(P(VDF-TrFE)(55/45))作为聚合物基体,0.75BiFeO_(3)-0.25BaTiO_(3)(BFO-BTO)纳米纤维作为填料以提高共聚物的热导率。结果表明,少量的BFO-BTO纳米纤维即可实现共聚物热导率的提高。在75℃时,纳米纤维含量为2%的复合材料的热导率为0.21 W·m^(-1)·K^(-1),几乎是P(VDF-TrFE)(55/45)共聚物膜的2倍。同时,加入纳米纤维后共聚物的电热效应(ECE)几乎没有变化。这些结果表明少量BFO-BTO纳米纤维的加入在有效提高P(VDF-TrFE)(55/45)共聚物热导率的同时能够保持共聚物较高的ECE。In this work,the(P(VDF‑TrFE)(55/45))was used as polymer matrix and 0.75BiFeO_(3)‑0.25BaTiO_(3)(BFOBTO)nanofiber was used as fillers to enhance the thermal conductivity of the copolymer.The enhanced thermal conductivity was achieved by adding a small amount of BFO‑BTO nanofibers to the copolymer.A thermal conductivity of the composite film with 2%nanofibers was 0.21 W·m^(-1)·K^(-1) at 75℃,which was nearly twice that of the P(VDFTrFE)(55/45)copolymer film.At the same time,the electrocaloric effect(ECE)of the copolymer almost remained unchanged after the addition of nanofibers.The results suggest that the addition of BFO‑BTO nanofibers is effective to improve the thermal conductivity of P(VDF‑TrFE)(55/45)copolymer while maintaining high ECE.

关 键 词：铁电薄膜 纳米复合材料 电热效应 热导率 

分 类 号：O633.4[理学—高分子化学]