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首页> 外文期刊>Journal of Applied Polymer Science >Effect of a Small Amount of Sulfur on the Physical and Mechanical Properties of Peroxide-Cured Fully Saturated HNBR Compounds
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Effect of a Small Amount of Sulfur on the Physical and Mechanical Properties of Peroxide-Cured Fully Saturated HNBR Compounds

机译：少量硫对过氧化物固化的完全饱和HNBR化合物的物理和机械性能的影响

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摘要

Sulfur can be used as crosslink coagent in unsaturated elastomer. In this work, a fully saturated HNBR with 39 wt % nitrile content was selected to investigate the effect of a small amount of sulfur acting as crosslink coagent on the physical and mechanical properties of peroxide-cured vulcanizates. First, selective cleavage of polysulfide (-Sx-) and monosulfide(-S-) bond by combined thiol-piperidine treatment were performed and the existence of poly/monosulfide bond in sulfur-contained HNBR compounds was verified. Then, no-filler HNBR compounds with various content of sulfur were investigated to detect the influence of sulfur on the crosslink density and cure kinetics. The MDR results showed that the crosslink density of HNBR compounds reduced only when the amount of sulfur is 0.25 phr and above. Besides, the curing rate of no-filler HNBR compounds increased with the increasing of the amount of sulfur and reached a maximum at a dosage of 0.25 phr sulfur. Finally, physical and mechanical properties of fully formulated compounds were evaluated and it was found that the addition of small amounts of sulfur in fully saturated HNBR compounds could improve the dynamic properties of peroxide-cured HNBR compounds remarkably but at a cost of slightly higher compression set values and a small loss in heat aging resistance. In a conclusion, small amount of sulfur can impart the peroxide vulcanizates some "sulfide properties" like dynamic property, tensile strength, but at the same time, due to the introduction of sulfur, some "peroxide vulcanizates property" like heat-resistance property, hot air resistance were weakened slightly. (C) 2014 Wiley Periodicals, Inc.
机译：硫可用作不饱和弹性体中的交联助剂。在这项工作中，选择了具有39 wt％腈含量的完全饱和的HNBR，以研究少量硫作为交联助剂对过氧化物硫化的硫化橡胶的物理和机械性能的影响。首先，通过硫醇-哌啶联用处理选择性裂解多硫键（-Sx-）和单硫键（-S-），并验证了含硫HNBR化合物中聚/单硫键的存在。然后，研究了具有不同硫含量的无填料HNBR化合物，以检测硫对交联密度和固化动力学的影响。 MDR结果表明，仅当硫的量为0.25phr以上时，HNBR化合物的交联密度才降低。此外，无填料的HNBR化合物的固化速率随硫含量的增加而增加，在硫含量为0.25 phr时达到最大值。最后，对完全配制的化合物的物理和机械性能进行了评估，发现在完全饱和的HNBR化合物中添加少量硫可以显着改善过氧化物固化的HNBR化合物的动态性能，但压缩永久变形率稍高值和耐热老化性的少量损失。总而言之，少量的硫可以赋予过氧化物硫化橡胶一些“硫化物”的性能，如动态性能，拉伸强度，但同时，由于硫的引入，一些“过氧化物硫化橡胶的性能”如耐热性，热空气阻力略有减弱。 （C）2014威利期刊公司

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