磁性氮化硼取向导热环氧树脂的制备和性能  

Preparation and Properties of Heat-Conducting Epoxy Resins Based on the Oriented Magnetic Boron Nitride

作　　者：曾昌毅 许培俊[1] 李寒煜 邱方程 郑欣 郭新良 刘荣海 何运华 代克顺 皇剑 ZENG Changyi;XU Peijun;LI Hanyu;QIU Fangcheng;ZHENG Xin;GUO Xinliang;LIU Ronghai;HE Yunhua;DAI Keshun;HUANG Jian(School of Materials Science and Engineering,Chang an University,Xi'an 710064,China;Electric Power Research Institute of Yunnan Power Grid Co.,Ltd.,Kunming 650217,China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710064 [2]云南电网有限责任公司电力科学研究院,云南昆明650217

出　　处：《塑料工业》2024年第11期48-54,共7页China Plastics Industry

基　　金：国家自然科学基金(51978072),陕西省重点研发计划项目(2022GY-371,2023QCY-LL-26);云南电网有限责任公司科技项目(YNKJXM20230507);长安大学中央高校基本科研业务费专项资助(300102312404)。

摘　　要：为了在低导热填料含量下提升环氧树脂(EP)的热导率并保持EP原有性能,在氮化硼纳米片(BNNS)上通过共沉淀法引入磁性四氧化三铁(Fe_(3)O_(4))颗粒制备了磁性氮化硼纳米片(mBNNS),以EP为基体,在外加磁场下以mBNNS为填料制备导热环氧树脂(mBNNS-EP)复合材料。对mBNNS的结构、磁响应性和其在EP中的取向度以及mBNNS-EP复合材料的断面形貌、导热性能、热稳定性、绝缘性能和力学性能进行分析和表征。X射线衍射(XRD)和扫描电子显微镜(SEM)测试结果分别证明Fe_(3)O_(4)在BNNS表面的生成和mBNNS在EP中的良好取向。与EP相比,mBNNS-EP复合材料的热导率随着mBNNS含量的增加而升高,20%-mBNNS-EP复合材料的热导率最高,达到了1.239 W/(m·K)。mBNNS-EP复合材料的热分解温度超过303℃,玻璃化转变温度(T_(g))高于130℃,弯曲强度大于56.93 MPa,表明mBNNS-EP复合材料具有良好的热稳定性和力学性能。mBNNS在EP中的垂直取向使mBNNS-EP复合材料的热导率大幅提升,且mBNNS-EP复合材料基本维持了EP的其他性能。To improve the thermal conductivity of epoxy resin(EP)while maintaining its original properties at a low heat-conducting filler content,magnetic boron nitride nanosheets(mBNNSs)were prepared by introducing magnetic ferric oxide(Fe_(3)O_(4))particles onto boron nitride nanosheets(BNNSs)through a coprecipitation method.Under the external magnetic field,heat-conducting epoxy resin(mBNNSs-EP)composite materials were prepared by using EP as the matrix and mBNNSs as the filler.The structures,magnetic responsiveness,and orientation of mBNNSs in EP,along with the cross-sectional morphologies,heat-conducting,thermal stability,insulation,and mechanical properties of mBNNSs-EP composite materials,were analyzed and characterized.X-ray powder diffraction(XRD)and scanning electron microscope(SEM)results respectively confirm the synthesis of Fe_(3)O_(4)on the surface of BNNSs and the good orientation of mBNNSs in EP.Compared with EP,the thermal conductivity of the mBNNSs-EP composite materials rises as the mBNNSs content increases.The thermal conductivity of 20%-mBNNSs-EP composite material is the highest,reaching 1.239 W/(m·K).The heat decomposition temperature of mBNNSs-EP composite material exceeds 303℃,the glass transition temperature(T_(g))is over 130℃,and the bending strength is over 56.93 MPa,indicating that this mBNNSs-EP composite material has good thermal stability and mechanical properties.The vertical orientation of mBNNSs in EP significantly enhances the thermal conductivity of mBNNSs-EP composite material,and mBNNSs-EP composites basically maintain other properties of EP.

关 键 词：导热环氧树脂 磁性氮化硼纳米片 填料取向 热稳定性 弯曲强度 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]