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首页> 外文期刊>Journal of Applied Polymer Science >Thermal, Dielectric, and Mechanical Properties of SiC Particles Filled Linear Low-Density Polyethylene Composites
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Thermal, Dielectric, and Mechanical Properties of SiC Particles Filled Linear Low-Density Polyethylene Composites

机译：SiC颗粒填充线性低密度聚乙烯复合材料的热，介电和机械性能

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摘要

A thermally conductive linear low-density polyethylene (LLDPE) composite with silicon carbide (SiC) as filler was prepared in a heat press molding. The SiC particles distributions were found to be rather uniform in matrix at both low and high filler content due to a powder mixing process employed. Differential scanning calorimeter results indicated that the SiC filler decreases the degree of crystallinity of LLDPE, and has no obvious influence on the melting temperature of LLDPE. Experimental results demonstrated that the LLDPE composites displays a high thermal conductivity of 1.48 Wm1K1 and improved thermal stability at 55 wt % SiC content as compared to pure LLDPE. The surface treatment of SiC particles has a beneficial effect on improving the thermal conductivity. The dielectric constant and loss increased with SiC content, however, they still remained at relatively low levels (<102 Hz); whereas, the composites showed poorer mechanical properties as compared to pure LLDPE. In addition, combined use of small amount of alumina short fiber and SiC gave rise to improved overall properties of LLDPE composites.
机译：在热压成型中制备了以碳化硅（SiC）为填料的导热线性低密度聚乙烯（LLDPE）复合材料。由于采用了粉末混合工艺，发现在低和高填料含量下，SiC颗粒在基体中的分布相当均匀。差示扫描量热仪结果表明，SiC填料降低了LLDPE的结晶度，并且对LLDPE的熔融温度没有明显的影响。实验结果表明，与纯LLDPE相比，LLDPE复合材料显示出1.48 Wm1K1的高热导率，并且在55 wt％的SiC含量下具有更高的热稳定性。 SiC颗粒的表面处理对改善导热性具有有益的作用。介电常数和损耗随SiC含量的增加而增加，但仍保持在相对较低的水平（<102 Hz）;相反，与纯LLDPE相比，复合材料的机械性能较差。此外，少量使用氧化铝短纤维和SiC可以提高LLDPE复合材料的整体性能。

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