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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。
GO / NBR-PU and G / NBR-PU ternary were synthesized by hot-press molding with graphene oxide (GO) or flake graphite (G) by blending nitrile rubber (NBR) and polyurethane (PU) The effects of graphene oxide and flake graphite on the dynamic mechanical properties of NBR-PU blends were investigated by means of DMA, FTIR and SEM. The results show that the loss tangent (Eq), storage loss modulus (E ’) and storage modulus (E’) increase first and then decrease with the increase of GO content after GO addition. When GO content reaches the critical value (With NBR mass ratio of 3%), the dynamic mechanical properties of tan δ, E "and E ’showed better performance; addition of flake graphite, NBR-PU blends damping and mechanical properties have A certain increase, but with the further increase in content, the damping performance and mechanical properties decreased. The microscopic analysis shows that the enhancement effect of GO is mainly due to the interface effect. Whether graphene oxide or flake graphite has a strong agglomeration effect in the matrix, the main reason for the decrease in performance is its agglomeration effect.