受阻酚AO-80/NBR/PVC交联复合材料的结构与动态力学性能

在丁腈橡胶(NBR)/聚氯乙烯(PVC)共混基体中添加了受阻酚AO-80, 制备了AO-80/NBR/PVC交联复合材料, 并研究了其微观结构和动态力学性能。扫描电镜、 透射电镜的结果证明, 大部分AO-80溶解在NBR/PVC基体中, 少量的AO-80以亚微米尺寸的微粒分散于基体中; X射线衍射、 差示扫描量热分析(DSC)结果证明, AO-80在基体中处于非晶态。DSC、 动态热机械分析的结果表明, AO-80与基体之间形成了很强的分子间作用力, 使材料的玻璃化温度大幅度上升。同时, AO-80/NBR/PVC交联复合材料的损耗因子tanδ-温度T曲线只有一个单峰, 与纯的NBR/PVC交联橡胶相比, 随着AO-80用量增加, tanδ峰明显向高温移动, 并且峰值由0.96增加到1.56。AO-80/NBR/PVC交联复合材料呈现明显的拉伸取向, 具备优异的力学强度, 具有很好的实用价值。 

Microstructure and dynamic mechanical properties of hindered phenol AO-80/NBR/PVC crosslinking composites

The hindered phenol AO-80/nitrile-butadiene rubber (NBR)/poly(vinyl chloride) (PVC) crosslinking composites were prepared and their microstructure and dynamic mechanical properties were investigated. SEM and TEM prove that the majority of AO-80 dissolve in the NBR/PVC matrix and the remnants AO-80 in the submicro-size particles distribute in the matrix. The DSC and XRD results illustrate that AO-80 in the matrix exists in an amorphous form. The results of DSC and DMTA prove that strong intermolecular interactions are formed between AO-80 and NBR/PVC matrix. All the AO-80/NBR/PVC crosslinking composites have only one tanδ peak, which displays the excellent compatibility between the AO-80 and the NBR/PVC matrix. More importantly, the tanδ peaks of the crosslinking composites shift to the higher temperature with increasing of the AO-80 amount in the composites, and the tanδ value of the crosslinking composites obviously synchronously increases. The chemical crosslinking of the composites results in considerable tensile strength. The high damping and mechanical properties endow the composites with a potential and promising application future in engineering.