片状石墨粉/受阻酚小分子-丁腈橡胶共混物动态力学性能

以丁腈橡胶(NBR)为基体,添加受阻酚小分子2,2′-亚甲基双-(4-甲基-6-叔丁基苯酚)(AO-2246)构成杂化体系,在体系中添加片状石墨粉(FGP),研究其对共混物动态力学性能的影响,借助DMA、FTIR和SEM等手段,研究了FGP/AO-2246-NBR共混物的动态力学性能。结果表明:将FGP加入AO-2246-NBR共混物中后,损耗角正切值、动态储能模量及损耗模量均随着FGP含量的增加先增加后减小,当FGP含量达到临界值(质量分数10%左右)时,其动态力学性能损耗角切值、动态储能模量及损耗模量才表现出较好的性能。通过红外光谱分析发现,三元共混物的氢键效应不是决定动态力学性能的关键因素,这与FGP本身的特性及形成的微观结构有关。微观形貌的形成是FGP与AO-2246-NBR共混物间相互作用的结果。

Dynamic mechanic property of flake graphite powder/hindered phenol-nitrile butadiene rubber blends

The hybrid system is prepared basing on nitrile butadiene rubber (NBR) matrix with addition of 2,2'-methylenebis (4-methyl-6-tert-butyl-phenol)(AO-2246) hindered phenol. The flake graphite powder (FGP) was introduced into the system in order to study its impact on the dynamic mechanic property of the blends. The dynamic mechanic property of FGP/AO-2246-NBR blends was studied by DMA, FTIR, SEM, etc. The results suggest that after the addition of FGP into AO-2246-NBR blends, the tangent of loss angle, dynamic storage modulus and loss modulus all present a trend which increase and then decrease when the content of FGP increases. By the time the content of FGP reaches its critical value(mass ratio: about 10%), the dynamic mechanic property such as the tangent of loss angle, dynamic storage modulus and loss modulus would have better performance. According to the FTIR analysis, hydrogen bonding effect is not the key factor to the dynamic mechanic property of ternary blends system. It has great correlation to the characteristics of FGP itself as well as the formation of microstructure which results from the interaction between FGP and AO-2246-NBR blends.