氮化硼负载BT@PANI核壳粒子协同改善复合材料介电与导热性能  

Simultaneously improved dielectric property and thermal conductivity of PVDF-based composites by BNNS loaded with BT@PANI core-shell particles

作　　者：王海燕[1] 黄齐格 咸龙帝 杨千 贾晓松 白得辉 WANG Haiyan;HUANG Qige;XIAN Longdi;YANG Qian;JIA Xiaosong;BAI Dehui(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学材料科学与工程学院,兰州730050

出　　处：《功能材料》2024年第10期10134-10141,共8页Journal of Functional Materials

基　　金：甘肃省自然科学基金(23JRRA816);国家自然科学基金(51767016)。

摘　　要：采用原位聚合法对氮化硼纳米片(BNNS)进行了聚多巴胺(PDA)的表面修饰,利用PDA的粘附性在BNNS表面负载钛酸钡@聚苯胺(BT@PANI)核壳粒子制备了分级结构复合填料。结果显示,BNNS单片的BT@PANI负载量对复合材料介电和导热性能影响显著;与BT@PANI/PVDF复合材料比较,所得复合材料的介电性能随频率变化的稳定性得到明显改善。BNNS单片BT@PANI负载量最大的复合材料界面极化最弱,介电性能表现出更好的频率稳定性,20%(质量分数)的复合材料介电常数和损耗值分别是14.8和0.082(10^(5)Hz),热导率降到了最低的0.64 W/mK。频率高于10^(3)Hz,这种新型复合材料介电损耗下降幅度是介电常数的2倍以上。该工作同步实现了聚合物基复合材料的介电常数提高、介电损耗抑制及导热性能提升,为储能聚合物基复合电介质的发展提供了新思路。Barium titanate@polyaniline(BT@PANI)core-shell particles were deposited on the boron nitride nanosheets(BNNS)surface to prepare a novel composite filler utilizing the adhesion of polydopamine(PDA)which had been synthesized as the surface modification of the boron nitride nanosheets(BNNS)by in-situ polymerization.The results showed that the BT@PANI load content of the single BNNS sheet had a significant effect on the dielectric property and thermal conductivity of the poly(vinylidene fluoride)-based(PVDF-based)composite materials.Moreover,compared with the BT@PANI/PVDF composite,the dielectric properties of the composites are significantly improved with frequency variation.When the BT@PANI load content on single BNNS is maximum,compared with the BT@PANI/PVDF composites with the same filling amount,the interface polarization of the composites is the weakest,and the dielectric properties show better frequency stability.Their values of the composite at 20wt%filler loading are 14.8 and 0.082(10^(5)Hz),respectively.The thermal conductivity of the composite also declined to a minimum of 0.64 W/(m·K).At frequencies higher than 10^(3)Hz,the dielectric loss of the composites decreases by more than twice the dielectric constant.This work have realized synchronously to enhance the dielectric constant,suppress dielectric loss and endow high thermal conductivity,which provides an innovative idea for the development of energy storage polymer-based composite dielectric.

关 键 词：聚合物基复合材料 氮化硼纳米片 核壳粒子 介电性能 导热性能 

分 类 号：TB33[一般工业技术—材料科学与工程]