摘要
为了降低聚合物基导热复合材料中填料的含量,用聚酰胺6(PA6)/聚丙烯(PP)两相聚合物作为基体,研究了PA6/PP/鳞片石墨(FG)和PA6/FG复合材料的热导率随FG含量的变化规律。PA6/FG复合材料中FG质量分数为30%时,复合材料的热导率为1.85 W/(m·K),而PA6/PP/FG复合材料热导率达到1.88 W/(m·K)时,FG的质量分数仅需20%,说明PP作为体积排除相,优化了FG在PA6中的分布。以PA6/PP作为基体,达到与PA6单一基体相近的热导率时可以降低FG的填充量,改善导热复合材料的加工性能和力学性能。同时研究了不同FG含量下两种复合材料的电阻率,结果发现,在FG质量分数为30%时,PA6/PP/FG复合材料的体积电阻率比PA6/FG的体积电阻率低两个数量级,间接证实PP的加入改变了FG在PA6中的分布。用扫描电子显微镜对FG在PA6/PP/FG复合材料中的分布进行了研究,结果表明,当FG质量分数超过30%时,FG相互之间的接触增多。
Polyamide 6（PA6） / polypropylene（PP） as a two-phase polymer matrix was used to reduce the filler content of thermally conductive composites based on polymer materials. Thermal conductivities of both PA6/PP/flake graphite（FG） and PA6 /FG composites with different FG content were studied. Thermal conductivity of PA6 /FG composite is 1.85 W/（m·K） when FG content is 30% ; while thermal conductivity of PA6 /PP/FG composite could reached to 1.88 W/（m· K） as long as FG content is 20%. This implies that PP as a size-exclusion phase could optimize the distribution of FG in PA6. FG content could be reduced when thermal conduetivities of PA6 /PP/FG composites reach to the same value as PA6 /FG composites, thus could improve the processing performance and mechanical properties of thermally conductive composites. Electrical resistivities of PA6 /PP/FG and PA6/FG composites were also studied. The results show that the volume electrical resistivity of PA6/PP/FG composite is two orders of magnitude lower than PA6 / FG composite when FG content is 30%. This indicates that the addition of PP changes the distribution of FG in PA6. The distribution of FG in PA6/PP/FG composite was studied by SEM. It showes that the possibility of FG contact with each other is increased when the content exceeds 30%.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2015年第9期1-6,共6页
Engineering Plastics Application
关键词
热导率
聚酰胺6
聚丙烯
鳞片石墨分布
体积排除
thermal conductivity
polyamide 6
polypropylene
distribution of flake graphite
size-exclusion
