ABS/石墨/NBR导热复合材料性能的研究

Performance Study of ABS/Graphite/NBR Thermal Conductive Composites

采用熔融共混法制备丙烯腈-丁二烯-苯乙烯共聚物(ABS)/石墨/丁腈橡胶(NBR)导热复合材料,通过热常数分析仪、同步热分析仪、扫描电子显微镜、力学性能测试等手段研究了NBR、ABS高胶粉及石墨(G)的添加量对ABS复合材料导热性能及力学性能的影响。结果表明,ABS高胶粉和NBR均能明显提高ABS的热导率和缺口冲击强度,但是丁腈胶粉的改性效果优于高胶粉。以NBR作为ABS复合材料的增韧剂,随着石墨含量的增大,增韧效果下降,ABS复合材料的热导率提高到纯ABS的5倍,热分解温度提高40℃左右,热膨胀系数下降。当ABS/G/NBR复合材料的质量比为60/15/25时,其热导率为纯ABS的2倍,缺口冲击强度达21.8 kJ/m2,明显高于纯ABS(2.6kJ/m2)。

Thermally conductive ABS/graphite/nitrile butadiene rubber （NBR） composites were prepared by melt bleding method. The effects of NBR, ABS and graphite content on the thermal conductivity and mechanical property of the ABS composites were studied respectively by the thermal constant analyzer, synchronous thermal analysis, scanning electron microscopy and mechanical properties testing means. The results showed that ABS high glue powder and NBR could increase the thermal conductivity and Notched impact strength of ABS, but NBR was more suitable as a toughening agent for ABS composite. The toughening effect decreased as the graphite content increased. Meanwhile the thermal conductivity of the ABS composite was up to five times than that of the pure ABS. The thermal decomposition temperature of the composite increased by about 40℃ and the thermal expansion coefficient failed. When the mass ratio of ABS/G/NBR was 60/15/25, the thermal conductivity was two times than that of pure ABS and the impact strength was up to 21.8 kJ/m2 which was larger than that of pure ABS （2.6 kJ/m2）.