摘要
以甲基乙烯基硅橡胶(MVQ)为基体,片层氮化硼(BN)、球形Al_2O_3、碳纤维为填料,通过共混的方法制备了导热硅橡胶复合材料。利用热重分析仪(TGA),扫描电子显微镜(SEM),电子拉力试验机以及导热系数仪对复合材料的结构和性能进行了表征。结果表明:复合材料的热导率、热稳定性、力学性能、交联密度随着填料量的增加而增加。填料量达50vol.%时,尤以片层BN对热导率增加的效果突出,热导率从0.168增至1.8W/(m·K);碳纤维对复合材料的力学性能贡献最大,拉伸强度从0.48增加到2.98MPa;片层BN在橡胶基体中以面-面接触的方式均匀分散,更易于形成有效的导热网链。
Thermal conductive methyl vinyl silicone rubber （MVQ） composites were prepared by blending platelet BN, spherical A1203 powder or carbon fiber in the polymer matrix. Structure and properties of the composites were characterized by thermogravimetric analysis （TGA）, scanning electron microscope （SEM）, electronic tester and thermal conductivity measurement. The results show that the thermal conductivity, thermal stability, mechanical properties and cross linking density of the as-prepared composites enhance with increasing loading content of fillers. Thermal conductivity of the composites improves with the incorporation of platelet BN. The quantitative value increases obviously from 0. 168 to 1.8W/（m. K） with 50v% 4 dosage. Loading content of carbon fiber is more advantageous to the improvement of mechanical properties. The tensile strength of composites increases from 0.48 to 2.98MPa. Platelet BN disperses uniformly in the silicone rubber matrix via face-to-face method and more steadily forms effective heat-conductive network.
作者
张琳琳
钱家盛
杨斌
苗继斌
夏茹
陈鹏
程国君
ZHANG Linlin QIAN Jiasheng YANG Bin MIAO Jibin XIA Ru CHEN Peng CHENG Guojun(School of Chemistry and Chemical Engineering, Anhui University, Hefei 230039, China Anhui Province Key Laboratory of Environment-friendly Polymer Materials, Hefei 230039, China School of Materials Science and Engineering, Anhui University of Science ＆ Technology, Huainan 232001, China)
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2017年第5期815-819,共5页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目(51273001
51203002)
关键词
硅橡胶
热导率
片层BN
球形Al2O3
碳纤维
silicone rubber
thermal conductivity
platelet BN
spherical Al2O3
carbon fiber
