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Influence of 1,2-polybutadiene on properties of dicumyl peroxide cured brominated butyl rubber

机译:1,2-聚丁二烯对过氧化二枯基硫化溴化丁基橡胶性能的影响

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Peroxide curing of brominated butyl rubber (BIIR) is an attractive topic, but the degradation of BIIR during the curing is a drawback needed to be overcome. Coagent assisted peroxide curing system is an attractive and effective choice in order to increase the crosslink density of rubbers. 1,2-polybutadiene (1,2-PB) is used as a crosslinking coagent for the curing of BIIR by dicumyl peroxide (DCP), and the effect of 1,2-PB on the curing characteristics, crosslink density, and mechanical properties is investigated. The addition of 1,2-PB affects the curing characteristics of BIIR compound and significantly increases the crosslink density of BIIR vulcanizates. With increasing 1,2-PB content, the tensile strength and stresses at a given extension of BIIR vulcanizates increase, but the elongation at break decreases. A stress-softening effect of the carbon black filled BIIR vulcanizates is observed and becomes more pronounced with increasing 1,2-PB content. The addition of 1,2-PB increases the stress relaxation index of BIIR. GPC and C-13-NMR results indicate 1,2-PB participates in the crosslinking reaction, and the existence of 1,2-PB component in the insoluble fraction of BIIR/1,2-PB vulcanizates is confirmed by solid-state C-13-NMR. (c) 2015 Wiley Periodicals, Inc.
机译:溴化丁基橡胶(BIIR)的过氧化物硫化是一个有吸引力的话题,但是在硫化过程中BIIR的降解是一个需要克服的缺点。为了增加橡胶的交联密度,助剂辅助的过氧化物硫化体系是一种有吸引力且有效的选择。 1,2-聚丁二烯(1,2-PB)用作过氧化二枯基(DCP)固化BIIR的交联助剂,以及1,2-PB对固化特性,交联密度和机械性能的影响被调查。 1,2-PB的添加会影响BIIR化合物的固化特性,并显着增加BIIR硫化胶的交联密度。随着1,2-PB含量的增加,BIIR硫化橡胶在给定伸长下的拉伸强度和应力会增加,但断裂伸长率会降低。观察到炭黑填充的BIIR硫化橡胶的应力软化效果,并且随着1,2-PB含量的增加而变得更加明显。 1,2-PB的添加增加了BIIR的应力松弛指数。 GPC和C-13-NMR结果表明1,2-PB参与了交联反应,并且通过固态C证实了BIIR / 1,2-PB硫化橡胶的不溶级分中存在1,2-PB组分-13-NMR。 (c)2015年威利期刊有限公司

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