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以液态聚硫代醚为生胶,环氧树脂(EP)为硫化剂,制备了一种新型聚硫代醚密封剂。探讨了催化剂种类和EP硫化剂配方对聚硫代醚密封剂的影响,评价了密封剂的低温硫化性能以及低温硫化后的力学性能。研究结果表明:催化剂TMEDA的催化/促进效果最好,对应的EP硫化聚硫代醚密封剂具有最短的活性期;随着多官能度DEN431环氧树脂比例的提高,密封剂的拉伸强度呈先升高后下降的趋势,断裂伸长率却大幅度下降,100%定伸强度和硬度则逐渐提高;在低温环境下,EP硫化聚硫代醚密封剂的硫化速率明显快于MnO2硫化;与常温硫化相比,低温硫化后的力学性能并没有明显变化。 相似文献
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γ射线的辐射既可以使高分子发生交联,也可以使高分子降解。当γ射线剂量在16kGy以下时,以分子交联为主,在16kGy以上时,以分子降解为主。本文主要研究了不同剂量γ射线辐射对巯基封端液体聚硫橡胶及其耐高温航空煤油性能的影响,确定了适宜的辐射剂量为16kGy。 相似文献
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聚硫橡胶自1927年 J.C.帕特里克博士发现、研制并获得专利,已有几十年的历史。目前它成为世界密封剂的三大主干之一,每年消耗量达几千万吨。可见应用程度之广之深。国内虽有不少应用,但是相对之下,差距甚大。因此,有必要对此作一探讨。尤其是对液态聚硫橡胶密封剂(简称液态聚 相似文献
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In this article, modified polysulfide sealants with lower compression set were prepared by a simple method of introducing the diglycidyl ether of bisphenol A resin (DGEBA epoxy resin) into sealants. The investigation on reactivity analysis and gel faction test verified that the incorporation of epoxy resin in sealants was just a blending process rather than copolyaddition with polysulfide resin. Stress–strain behavior during compression revealed that the epoxy resin could reduce the compression stress when the sealants were loaded to a certain strain, which effectively lessened crosslink breakages and benefited to compression resistance. Also the rigid phenyl structure in epoxy resin may retard incidental slide between polysulfide chains and prevent interchange reactions between disulfide linkages. The incorporation of 2 phr epoxy resin distinctly reduced compression set of polysulfide sealant from 28.3% to 11.2% after compressed 25% at 23°C for 1 day. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献
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