摘要
针对常规片状氮化硼比表面积大,与环氧树脂复合时会急剧增大树脂黏度的问题,本研究制备了球形氮化硼,并将其作为填料与环氧树脂复合制备了球形氮化硼/环氧复合材料。研究了球形氮化硼/环氧复合材料的制备工艺和固化特性,对比研究了片状/球形氮化硼填料的形貌和填充量对环氧树脂复合材料力学性能和电学性能的影响规律。结果表明:随着反应温度升高,环氧树脂的固化度呈现“S”型曲线变化,整个固化过程可大致分为“慢-快-慢”3个阶段。力学性能方面,加入少量氮化硼可以提高环氧树脂复合材料的力学性能;高填充量时,球形氮化硼/环氧复合材料比片状氮化硼/环氧复合材料具有更优异的力学性能。电气性能方面,环氧树脂复合材料的相对介电常数随填料含量的增加而增大,介质损耗因数均低于0.02;与片状氮化硼/环氧复合材料相比,球形氮化硼/环氧复合材料的“填料-树脂”界面减少,具有更低的相对介电常数和介质损耗因数;添加适量的氮化硼能够显著提高复合材料的体积电阻率和电气强度。
Aiming at the problems of large specific surface area of conventional flake boron nitride and sharp increase in resin viscosity when compounded with epoxy resin,we prepared spherical boron nitride and used it as a filler to compound with epoxy resin to prepare spherical boron nitride/epoxy composites.The preparation process and curing characteristics of spherical boron nitride/epoxy composites were studied,and the influences of the morphology and filling amount of flake/spherical boron nitride fillers on the mechanical and electrical properties of epoxy resin composites were compared.The results show that with the increase of reaction temperature,the curing degree change curve of epoxy resin shows“S”shape,and the curing process can be roughly divided into three stages of“slow-fast-slow”.In terms of mechanical properties,adding a small amount of boron nitride can improve the mechanical properties of the epoxy resin composites;when the filling amount is high,spherical boron nitride/epoxy composites have better mechanical properties than flake boron nitride/epoxy composites.In terms of electrical properties,the relative dielectric constant of the epoxy resin composites increases with the increase of boron nitride content,and the dielectric loss factor is lower than 0.02;compared with the flake boron nitride/epoxy composites,the spherical boron nitride/epoxy composites have less“filler-resin”interface,lower relative dielectric constant and dielectric loss factor;adding an appropriate amount of boron nitride can significantly improve the volume resistivity and electric strength of composites.
作者
何润
黄正勇
张樱凡
赵腾
李晨昕
李剑
胡清华
HE Run;HUANG Zhengyong;ZHANG Yingfan;ZHAO Teng;LI Chenxin;LI Jian;HU Qinghua(State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400044,China)
出处
《绝缘材料》
CAS
北大核心
2024年第5期26-33,共8页
Insulating Materials
基金
国家自然科学基金资助项目(51707016)
芜湖市科技局项目(2022hg15)。
关键词
环氧树脂
球形氮化硼
绝缘性能
力学性能
epoxy resin
spherical boron nitride
insulating properties
mechanical properties
