氧化石墨烯对丁腈橡胶-聚氨酯共混物动态力学性能的影响

以丁腈橡胶(NBR)与聚氨酯(PU)为共混基体,添加氧化石墨烯(GO)或片状石墨(G)通过热压成型工艺合成GO/NBR-PU和G/NBR-PU三元体系复合材料,借助DMA、FTIR、SEM等手段,研究氧化石墨烯与片状石墨对NBR-PU共混物动态力学性能的影响。研究结果表明,GO加入后,损耗角正切值(tanδ)、损耗模量(E″)以及储能模量(E′)随着GO含量的增加先增加后减小,当GO含量达到临界值(与NBR质量比为3%)时,其动态力学性能tanδ、E″及E′表现出较好的性能;而添加片状石墨时,NBR-PU共混物的阻尼性能和力学性能均有一定的增强,但随着含量进一步增加,阻尼性能与力学性能有所下降。通过微观分析发现,GO的增强作用主要是因为界面效应,而无论是氧化石墨烯或是片状石墨,在基体中均有很强的团聚作用,而性能下降的主要原因就是其团聚作用。

Effects of graphene oxide on dynamic mechanic performances of nitrile butadiene rubber-polyurethane composites

By adding graphene oxide(GO) or graphite(G) in blending system of nitrile rubber(NBR) and polyurethane(PU),the GO/NBR-PU and G/NBR-PU ternary composites were prepared by the technology of hot-press moulding.The dynamic mechanic property of the GO/NBR-PU and G/NBR-PU composites were studied by DMA,FTIR,SEM and so on.The results suggest that the tangent of loss angle(tanδ),the storage modulus(E') and the loss modulus(E") of the GO/NBR-PU composites all present a trend of increasing originally and decreasing subsequently with the increase of GO content.At the same time,when the mass ratio of GO to NBR reach its critical value 3 ％,the composites have superior dynamic mechanic performances.As the graphite is added,the damping property and mechanical properties of the composites are enhanced,but the mechanical properties of the composites decrease with the increasing of more graphite content.Through microscopic analysis,the enhancement function of GO is mainly due to the interfacial effect.The main reason for the decrease of mechanical properties is the agglomeration of GO or graphite in NBR-PU composites.