无机化学学报

用于电卡制冷的聚(偏氟乙烯-三氟乙烯)(55/45)/0.75BiFeO₃-0.25BaTiO₃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)/0.75BiFeO₃-0.25BaTiO₃ composite for electrocaloric application

作者	单位	E-mail
朱余红	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
初宝进	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	chubj@ustc.edu.cn

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，0.75BiFeO₃-0.25BaTiO₃(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。

关键词: 铁电薄膜纳米复合材料电热效应热导率

基金项目: 国家重点研发计划(No.2020YFA0711502，2017YFA0701301)资助。

Abstract: In this work,the (P (VDF-TrFE)(55/45)) was used as polymer matrix and 0.75BiFeO₃-0.25BaTiO₃(BFO-BTO) 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 (VDF-TrFE)(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.

Keywords: ferroelectric film nanocomposites electrocaloric effect thermal conductivity

投稿时间：2022-09-07 修订日期：2023-03-03

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朱余红,初宝进.用于电卡制冷的聚(偏氟乙烯-三氟乙烯)(55/45)/0.75BiFeO₃-0.25BaTiO₃复合材料的制备及热导率增强[J].无机化学学报,2023,39(4):716-722.

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