文献类型：期刊文献

中文题名：氮化硼和不同尺寸氧化铝复配对尼龙6/聚丙烯复合材料导热性能的影响

英文题名：Effect of Boron Nitride and Alumina of Different Sizes on Thermal Conductivity of Nylon 6/Polypropylene Composites

作者：苏凡[1];张玲[1];李春忠[1]

机构：[1]上海多级结构纳米材料工程技术研究中心,超细材料制备与应用教育部重点实验室,华东理工大学材料科学与工程学院,上海200237

年份：2022

卷号：48

期号：2

起止页码：165

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：Scopus;北大核心:【北大核心2020】；CSCD:【CSCD_E2021_2022】；

基金：国家自然科学基金(21878092,21838003);上海市教育委员会科研创新计划项目;上海市优秀学术带头人(19XD1401400)。

语种：中文

中文关键词：氮化硼;氧化铝;热塑性复合材料;热导率

外文关键词：boron nitride;alumina oxide;thermoplastic composite;thermal conductivity

摘要：采用两步法将片状氮化硼(BN)和两种尺寸的球形氧化铝(纳米级Al_(2)O_(3):Nano-Al_(2)O_(3);微米级Al_(2)O_(3):Micro-Al_(2)O_(3))引入到尼龙6/聚丙烯(PA6/PP)合金中制备高导热的BN/Nano-Al_(2)O_(3)/Micro-Al_(2)O_(3)/PA6/PP复合材料。借助加工过程中的剪切力以及PP相的体积排斥作用,发现BN片和Al_(2)O_(3)球在PA6相中均匀地分散、取向和连接,小尺寸的Nano-Al_(2)O_(3)插入BN片间的缝隙中,而大尺寸的Micro-Al_(2)O_(3)嵌入并改变BN片的取向,二者共同辅助BN形成了三维导热网络,并减少了各向异性。与质量分数为25%的BN复配,当Nano-Al_(2)O_(3)和Micro-Al_(2)O_(3)质量分数分别为7.5%(即Nano-Al_(2)O_(3)-7.5和Micro-Al_(2)O_(3)-7.5)时,BN/Nano-Al_(2)O_(3)-7.5/Micro-Al_(2)O_(3)-7.5/PA6/PP复合材料的热导率达到最大,面内热导率为1.46 W/(m·K),面外热导率为1.39 W/(m·K)。在LED灯散热实验中,复合材料能使LED工作温度显著降低,说明其具有很好的应用性。
Introducing inorganic materials,such as boron nitride(BN),with good thermal conductivity and insulation properties into polymer materials can significantly enhance the thermal conductivity of the result composites.For thermoplastic composites,controlling the orderly distribution and connection of thermal conductivity fillers in the matrix during machining is key to improve thermal conductivity.In this study,the BN/Nano-Al_(2)O_(3)/Micro-Al_(2)O_(3)/PA6/PP composite with high thermal conductivity was prepared by introducing BN sheet and two sizes of alumina balls(Nano-Al_(2)O_(3)and Micro-Al_(2)O_(3))into nylon 6/polypropylene(PA6/PP)alloy by two-step method.By means of the shear force during the processing and the volume repulsion of PP phase,it was found that BN sheets and Al_(2)O_(3)spheres were uniformly dispersed,oriented and connected in the PA6 phase.Nano-Al_(2)O_(3)with small size was inserted into the gaps between BN sheets,while the addition of Micro-Al_(2)O_(3)of large size changed the orientation of BN sheets.Nano-Al_(2)O_(3)and Micro-Al_(2)O_(3)common auxiliary BN can form the three-dimensional heat transfer filler network,reducing the anisotropy of thermal conductivity.Mixed with 25%mass fraction BN,when the mass fraction of Nano-Al_(2)O_(3)and Micro-Al_(2)O_(3)was 7.5%,the thermal conductivity of BN/Nano-Al_(2)O_(3)-7.5/Micro-Al_(2)O_(3)-7.5/PA6/PP composite reached the maximum,the in-plane thermal conductivity was 1.46 W(m·K),and the through-plane thermal conductivity was 1.39 W(m·K).Meanwhile,the introduction of the two kinds of Al_(2)O_(3)greatly increased the tensile modulus of the composite.In addition,in the application of heat dissipation experiment,the composite reduced the temperature rise range of LED under working conditions.