固相剪切碾磨制备铝粉填充聚乙烯基高性能导热复合材料的研究  

Aluminum Filled Polyethylene-based Thermally Conductive High Performance Composites Prepared by Solid State Shear Milling

作　　者：吴贺君[1] 卢灿辉[2] 李庆业[2] 胡彪[1] 

机构地区：[1]四川农业大学食品学院,四川雅安625000 [2]四川大学高分子材料工程国家重点实验室,成都610065

出　　处：《材料工程》2016年第4期39-44,共6页Journal of Materials Engineering

基　　金：高分子材料工程国家重点实验室开放课题基金项目(sklpme2014-4-34);四川省教育厅自然科学类一般项目资助(16ZB0057)

摘　　要：采用固相剪切碾磨法(S3M)制备铝粉和线性低密度聚乙烯(LLDPE)的复合粉体,再经熔融加工获得高性能LLDPE/Al导热复合材料。借助扫描电镜(SEM)、激光粒度分析仪等表征铝粉在基体中的微观形态和分散状态,同时研究LLDPE/Al复合材料的热导率、力学性能和热稳定性。结果表明:固相剪切碾磨过程中铝粉受磨盘挤压、拉伸、摩擦剪切等复合力场作用,由较小球形颗粒变为较大片状,同时在基体中均匀分散且界面结合得以增强,因此复合材料拥有更高的热导率、更好的力学性能和热稳定性。当铝粉填充质量分数为80%时,经固相剪切碾磨10次制备的复合材料热导率高达8.782W·m^(-1)·K^(-1),拉伸强度和弯曲强度分别为33.00MPa和31.16MPa,初始分解温度比基体提高约13℃。Solid state shear milling（S3M） followed by melt mixing process was applied to prepare linear low-density polyethylene（LLDPE）/aluminum（A1） composites with high performance. The mor-phological change of A1 particulates during S3M was characterized by scanning electron microscope （SEM） and laser scattering particle analyzer. The thermal conductivity, mechanical properties and thermal stability of the LLDPE/A1 composites were investigated. The results indicate that, under the complex combination of shearing, compression, stretching and friction actions, the spherical A1 particulates are squeezed into flakes during compounding with LLDPE by S3M, and their dispersion and interfacial adhesion are improved as well, leading to significance properties enhancement of the resulting composites. At 80% （mass fraction） filler loading, thermal conductivity of the composite prepared by S3M for 10 cycles is as high as 8. 782W·m-1·K-1 , and the tensile strength and flexural strength respectively are 33.00MPa and 31.16MPa. Moreover, a significant increase of 13℃ in the onset decomposition temperature of degradation is observed, which suggests that the thermal stability of the composite prepared by S3M is also improved.

关 键 词：固相剪切碾磨 聚乙烯 铝粉 热导率 力学性能 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业] TQ327.8