受阻酚/丁腈橡胶复合材料的结构与性能

在丁腈橡胶中添加受阻酚AO-60制备受阻酚/丁腈橡胶复合材料。利用差示扫描量热(DSC)、 扫描电镜(SEM)、 X射线衍射(XRD)、 动态力学分析(DMTA)等测试手段对该复合材料的结构进行了表征, 并对其动态力学性能进行了研究。结果表明: 该复合材料中受阻酚AO-60的结晶性能发生变化, 由结晶态转变为无定形态。AO-60在丁腈橡胶基体中形成了富集区, 在AO-60分子间和AO-60与NBR分子之间形成了大量的氢键。该复合材料不仅存在丁腈橡胶的玻璃化转变, 还有两次异常的松弛过程, 这归因于体系中分子间氢键的解离。该复合材料具有很高的损耗性能, 有很好的阻尼材料应用前景。 

Structure and properties of hindered phenol/nitrile-butadiene rubber composites

A crosslinked nitrile-butadiene rubber(NBR)/hindered phenol composite was successfully prepared by mixing tetrakis(methylene-3-(3-5-ditert-butyl-4-hydroxy phenyl) propionyloxy) methane(AO-60) into NBR.The microstructure of the NBR/AO-60 composite was characterized by DSC,SEM,XRD and DMTA,and its thermal and dynamic mechanical properties were studied.The results show that the pure AO-60 is a crystalline material,but in the hindered phenol/NBR composites most of the AO-60 molecules are amorphous and form AO-60 domains.In the case of NBR/AO-60 composites,large numbers of hydrogen bonds are formed not only in the AO 60 molecules within AO-60-rich domains but also between NBR and AO-60 molecules.The dissociation of the intermolecular hydrogen bonds leads to the appearance of two novel transitions above the glass transition temperature of the matrix NBR.It was found that it is a good damping material because of the novel dynamic mechanical property of the NBR/AO-60 composites.