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Mercapto-modified copolymers in elastomer blends. IV. The compatibilization of natural rubber/EPDM blends

机译:弹性体共混物中的巯基改性共聚物。 IV。天然橡胶/ EPDM共混物的相容性

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摘要

Ethylene-propylene-diene functionalized with mercapto groups (EP-DMSH) was employed as compatibilizing agent for natural rubber (NR)/EPDM blends, resulting in a substantial increase of the ultimate tensile strength of these blends without affecting the elongation at break. There is also a decrease of the curing time with the addition of as low as 2.5 phr of EPDMSH, mainly in NR/EPDM (70:30 wt %) blend, indicating the accelerator effect of this functionalized copolymer. This copolymer also increased the crosslink degree and the gel content. From dynamic mechanical analysis (DMTA), it was demonstrated that EPDMSH improves the covulcanization process. The reactive compatibilization of EPDMSH was demonstrated by the presence of insoluble material in nonvulcanized/compatibilized blends and by its thermogravimetric (TGA) analysis. (C) 2002 John Wiley Sons, Inc. [References: 19]
机译:使用巯基官能化的乙烯-丙烯-二烯(EP-DMSH)作为天然橡胶(NR)/ EPDM共混物的增容剂,导致这些共混物的极限拉伸强度大大提高,而不会影响断裂伸长率。通过添加低至2.5 phr的EPDMSH(主要是在NR / EPDM(70:30 wt%)共混物中),还可以减少固化时间,这表明该官能化共聚物具有促进作用。该共聚物还增加了交联度和凝胶含量。通过动态力学分析(DMTA),证明EPDMSH改善了硫化过程。 EPDMSH的反应性相容性通过未硫化/相容的共混物中不溶物的存在及其热重(TGA)分析得到证明。 (C)2002 John Wiley Sons,Inc. [参考:19]

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