复合材料科学与工程Issue(11)：5-13,9.DOI:10.19936/j.cnki.2096-8000.20241128.001
基于纳米氮化硼-聚氨酯/玻纤三维骨架的环氧导热复合材料性能研究
Performance investigation of epoxy thermal conductive composite based on nano boron nitride-polyurethane/fiberglass three-dimensional structure
摘要
Abstract
Fiber-reinforced epoxy resin composite is widely employed in aerospace and other industries due to its low specific gravity,high specific strength,low curing shrinkage,and excellent corrosion resistance.However,the demand for thermal conductivity in this material has become increasingly stringent due to its special processing techniques and the heat dissipation requirements of the electronics and power industries.In this study,flame-re-tardant polyurethane open-cell foam(PUF)was used as a template;and nano boron nitride(BNNS)was intro-duced to modify this material.A low-loading boron nitride-polyurethane/fiberglass/epoxy thermal conductive com-posite was prepared using an impregnation-hot pressing method to investigate the effects of different BNNS contents on the thermal and electrical properties of the composite material.The results show that BNNS grows in situ on the three-dimensional skeleton surface of PUF,and as the BNNS content increases,the thermal performance of the composite material significantly improves.When the content of boron nitride nanosheets is 1vol%,the thermal con-ductivity of the composite material reaches 0.53 W/(m·K),which represents a 103%increase,while the coeffi-cient of linear expansion decreases by 77.6%.With a BNNS content of 0.5vol%,the glass transition temperature of the composite material increases by 13.5℃,and it exhibits optimal thermal stability and mechanical properties.Moreover,thanks to the excellent insulation properties of boron nitride,the volume resistivity of the composite mate-rial is elevated to 7.2×1015 Ω·cm,and its arc resistance is significantly enhanced.关键词
导热复合材料/聚氨酯泡沫/氮化硼纳米片/耐电弧性能/绝缘性能Key words
thermal conductive composite materials/polyurethane foam/boron nitride nanosheets/arc resist-ance performance/insulation performance分类
通用工业技术引用本文复制引用
许培俊,王乾,郑欣,李寒煜,郭新良,刘荣海..基于纳米氮化硼-聚氨酯/玻纤三维骨架的环氧导热复合材料性能研究[J].复合材料科学与工程,2024,(11):5-13,9.基金项目
国家自然科学基金面上项目(51978072) （51978072）
陕西省重点研发计划项目(2022GY-371) （2022GY-371）
长安大学中央高校基本科研业务费专项资助(300102312404) （300102312404）
