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首页> 外文期刊>Journal of Applied Polymer Science >HNBR/EPDM blends: Covulcanization and compatibility
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HNBR/EPDM blends: Covulcanization and compatibility

机译：HNBR / EPDM共混物：硫化和相容性

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摘要

The covulcanization characteristics, mechanical properties, compatibility, and hot-air aging resistance of hydrogenated nitrile-butadiene rubber (HNBR)/ethylene-propylene-diene rubber (EPDM) blends cured with either sulfur or dicumyl peroxide (DCP) were studied. The difference between M_H and M_L (M_H - M_L), rheometer graphs, selective swelling and a dynamic mechanical analysis of HNBR/EPDM blends confirmed that the peroxide curing system gives better covulcanization characteristics than the sulfur curing system and peroxide exhibited higher crosslink efficiency on EPDM while sulfur showed larger crosslink efficiency on HNBR. Dynamic mechanical analysis and morphology indicated that the compatibility between HNBR and EPDM is limited. Tensile strength and elongation at break of the sulfur-cured blends are greater than those obtained with peroxide and increase with the HNBR fraction. The blends crosslinked with peroxide retain their tensile strength but not their elongation at break after hot air ageing better than blends vulcanized by sulfur.
机译：研究了用硫磺或过氧化二枯基（DCP）固化的氢化丁腈橡胶（HNBR）/乙丙二烯橡胶（EPDM）的共硫化特性，机械性能，相容性和抗热风老化性能。 M_H和M_L（M_H-M_L），流变仪图，选择性溶胀和HNBR / EPDM共混物的动态力学分析之间的差异证实了过氧化物固化体系比硫磺固化体系具有更好的硫化性能，并且过氧化物在EPDM上表现出更高的交联效率而硫在HNBR上显示出更大的交联效率。动态力学分析和形态学表明，HNBR和EPDM之间的相容性受到限制。硫固化共混物的拉伸强度和断裂伸长率大于用过氧化物获得的拉伸强度和断裂伸长率，并随HNBR分数的增加而增加。用过氧化物交联的共混物比热硫化后的共混物保留了其抗张强度，但在热风老化后的断裂伸长率没有提高。

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