采用固相剪切碾磨法(S3 M)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LL-DPE/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(S3 M)followed by melt mixing process was applied to prepare line-ar low-density polyethylene(LLDPE)/aluminum(Al)composites with high performance.The mor-phological change of Al particulates during S3 M was characterized by scanning electron microscope (SEM)and laser scattering particle analyzer.The thermal conductivity,mechanical properties and thermal stability of the LLDPE/Al composites were investigated.The results indicate that,under the complex combination of shearing,compression,stretching and friction actions,the spherical Al par-ticulates are squeezed into flakes during compounding with LLDPE by S3 M,and their dispersion and interfacial adhesion are improved as well,leading to significance properties enhancement of the resul-ting 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 de-composition temperature of degradation is observed,which suggests that the thermal stability of the composite prepared by S3 M is also improved.
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