PPS复合导热材料的研究与有限元模型分析

通过有限元分析软件ABAQUS,模拟了三氧化二铝(Al2O3)填充聚苯硫醚(PPS)两相复合材料逾渗结构以及Al2O3填充PPS合金三相复合材料双逾渗结构,并将得到的理论导热率与实验结果进行对比验证,分析了填料分布情况对材料热导率的影响。模拟结果表明:只有当导热填料含量超过逾渗阈值,其导热性能才能有明显的提高,双重逾渗结构的形成,能有效降低逾渗阈值。SEM分析表明,选用不同的合金组分,由于相容性的差异和黏度的差异,填料在PPS合金中的分布情况也有不同,热导率也有较大的差异。在所述配方中PPS/UHMWPE/Al2O3(质量比为35:15:50)复合体系热导率最高,可达1.592W/(m.K),而同质量配比的PPS/PS/Al2O3复合体系的最低,只有0.639W/(m.K)。

Research and the Finite Element Analysis of Thermal Conductive PPS Composites

The paper simulated the percolation structure of polyphenylene sulfide/aluminum sesquioxide (PPS/Al_2O_3) biphase composite and the bi-percolation structure of the triphase composite of PPS alloy and Al_2O_3, and the calculation of the theoretical thermal conductivity coefficient and the test result were com-pared with the help of the finite element analysis (FEA) software of ABAQUS. The effect of the distribution of the thermal conductive filler on the thermal conductivity coefficient of the composites was studied. The re-sult validated that the thermal conductivity coefficient rose sharply only when the filler fraction was higher than the percolation threshold, forming a bi-percolation structure, which could reduce percolation threshold effec-tively. The SEM images showed that the filler formed different distributions in the PPS alloy which resulted in different thermal conductivity coefficients, because of the different viscosity and the compatibility. The PPS/ UHMWPE/Al_2O_3 (the weight proportion was 35:15:50) composite system got a highest thermal conductivity