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以沥青基短纤维为填料、ABS树脂为基体,采用热压成型工艺制备了短纤维/ABS树脂复合材料,研究了短纤维在复合材料中的分散形貌及其含量和长度对复合材料导电、导热和抗冲击性能的影响。研究结果表明:短纤维在复合材料中分散较为均匀,可以形成较好的导电和导热网络。复合材料沿垂直热压方向的室温电阻率和热导率随短纤维含量和长度的增加而分别呈降低和升高趋势,其电阻率具有明显的“渗逾”现象,添加0.5mm长的纤维粉的复合材料的导电突变用量约为13wt.%,其电阻率为0.6Ω·m,而填充长度为3mm和6mm短纤维的复合材料的渗逾值约为11wt.%,相应电阻率降低至9.0×10-3Ω·m和1.0×10-3Ω·m。当3mm长短纤维含量为29wt.%时,复合材料的室温热导率为23.3W/m·K,较纯ABS树脂提高了136倍。
Using short fiber as filler and ABS resin as matrix, the short fiber / ABS resin composite was prepared by hot pressing process. The dispersion morphology, content and length of short fiber in the composite were studied. Effect of thermal and impact resistance. The results show that: the short fibers dispersed in the composite material is more uniform, can form a good conductive and thermal conductivity network. The room temperature resistivity and thermal conductivity along the direction of vertical hot pressing decreased and increased with the increase of short fiber content and length, respectively. The resistivity of the composites showed obvious “infiltration” phenomenon. Adding 0.5mm long Of the composite material of the fiber powder had a conductivity of about 13 wt.% And a resistivity of 0.6 Ω · m, whereas the composite material filled with the staple fibers of 3 mm and 6 mm in length had a value of about 11 wt.% And the corresponding resistivity Reduced to 9.0 × 10 -3 Ω · m and 1.0 × 10 -3 Ω · m. When the content of 3mm fibers is 29wt.%, The room temperature thermal conductivity of the composites is 23.3W / m · K, which is 136 times higher than pure ABS resin.