受阻酚/羧基丁腈橡胶复合材料的结构及动态力学性能

将羧基丁腈橡胶(XNBR)和受阻酚2，2′-亚甲基双-(4-甲基-6-叔丁基苯酚) (AO-2246)混合制备出挤压和未挤压AO-2246/XNBR复合材料，并对其结构及动态力学性能进行了研究。研究结果表明，AO-2246在XN2BR基体中的分散状态对体系的动态力学性能影响较大。在未挤压样品中，大部分AO-2246分子以晶体颗粒的形式存在，体系的损耗因子(tanδ)比纯XNBR基体低；而在挤压样品中，由于热压淬火过程中两组分发生杂化，体系的tanδ值明显增大，体系的阻尼性能显著提高。差示扫描量热(DSC)分析和扫描电镜(SEM)观察表明，当AO-2246质量分数高于40%后，杂化体系中AO-2246以3 种形态存在：杂化形态、微相分离态以及结晶态，它们共同对体系的动态力学性能产生影响。AO-2246质量分数为50%的杂化体系的tanδ峰峰值高达3.5，同时该峰位置由低温区向高温方向移动至室温附近，从而使AO-2246/XNBR复合材料成为一种极具潜力的高性能阻尼材料。

Structure and dynamic mechanical properties of hindered phenol/carboxylated nitrile rubber composites

The structure and dynamic mechanical properties of unpressed and pressed composites consisting of carboxylated nit rile rubber (XNBR) and hindered phenol compound 2，2'-methylenebis-(6-tertbutyl-4-methyl-phenol) (AO-2246) were investigated respectively. The results show that the dispersion state of AO-2246 in the XNBR matrix has an important influence on the dynamic mechanical properties of the composites. In unpressed AO-2246/XNBR composites，most AO-2246 molecules exist in the form of crystalline particles，which leads to alower tanδ value than that of the pure XNBR matrix. On the contrary，in the pressed composites，all AO-2246 molecules are hybridized with XNBR during the hot-pressing and quenching process，so the tanδ value is increased remarkably and the damping property is improved significantly. DSC measurement and SEM observation show that in the AO-2246/XNBR hybrids with a larger AO-2246 mass fraction than 40%，AO-2246 molecules can be divided into three kinds：hybrid，microseparated，and crystal，which affect the dynamic mechanical properties of the composites together. The peak value of the tanδ peak of AO-2246/XNBR (50 wt%) hybrid reaches 3.5，meanwhile，its peak position also shifts to room temperature，demonst rating that AO-2246/XNBR composite is a promising high-performance damping material.