PDF(Pubmed)
Abstract：
Rubber blends based on styrene-butadiene rubber, ethylene-propylene-diene monomer rubber and a combination of both rubbers were cured with different sulfur and peroxide curing systems. In sulfur curing systems, two type of accelerators, namely tetramethylthiuram disulfide, N-cyclohexyl-2-benzothiazole sulfenamide, and combinations of both accelerators were used. In peroxide curing systems, dicumyl peroxide, and a combination of dicumyl peroxide with zinc diacrylate or zinc dimethacrylate, respectively, were applied. The work was aimed at investigating the effect of curing systems composition as well as the type of rubber or rubber combinations on the curing process, cross-link density and physical-mechanical properties of vulcanizates. The dynamic mechanical properties of the selected vulcanizates were examined too. The results revealed a correlation between the cross-link density and physical-mechanical properties. Similarly, there was a certain correlation between the cross-linking degree and glass transition temperature. The tensile strength of vulcanizates based on rubber combinations was higher when compared to that based on pure rubbers, which points out the fact that in rubber combinations, not only are the features of both elastomers combined, but improvement in the tensile characteristics can also be achieved. When compared to vulcanizates cured with dicumyl peroxide, materials cured with a sulfur system exhibited higher tensile strength. With the application of co-agents in peroxide vulcanization, the tensile strength overcame the tensile behavior of sulfur-cured vulcanizates.
摘要：
基于苯乙烯-丁二烯橡胶的橡胶共混物，乙烯-丙烯-二烯单体橡胶和两种橡胶的组合用不同的硫和过氧化物固化体系固化。在硫磺固化系统中，两种加速器，即二硫化四甲基秋兰姆，N-环己基-2-苯并噻唑亚磺酰胺，并且使用了两种加速器的组合。在过氧化物固化系统中，过氧化二异丙苯,以及过氧化二异丙苯与二丙烯酸锌或二甲基丙烯酸锌的组合，分别,被应用了。这项工作旨在研究硫化体系组成以及橡胶或橡胶组合的类型对硫化过程的影响，硫化胶的交联密度和物理机械性能。还检查了所选硫化橡胶的动态机械性能。结果表明，交联密度与物理机械性能之间存在相关性。同样，交联度与玻璃化转变温度之间存在一定的相关性。与基于纯橡胶的硫化橡胶相比，基于橡胶组合的硫化橡胶的拉伸强度更高，这指出了一个事实，在橡胶组合中，不仅两种弹性体的特征相结合，但是也可以实现拉伸特性的改善。与用过氧化二异丙苯固化的硫化橡胶相比，用硫体系固化的材料表现出更高的拉伸强度。随着助剂在过氧化物硫化中的应用，拉伸强度克服了硫磺硫化硫化胶的拉伸行为。
