共查询到16条相似文献,搜索用时 250 毫秒
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硫化体系对动态硫化EPDM/POE热塑性弹性体性能的影响 总被引:1,自引:0,他引:1
采用动态硫化的方法在Haake转矩流变仪上制备了三元乙丙橡胶/聚烯烃(EPDM/POE)热塑性弹性体(TPV),并分别对不同硫化体系和硫化剂用量对TPV交联密度和性能的影响进行了研究。结果表明,随硫化剂用量的增加,TPV的交联密度增大,其中硫黄硫化体系的TPV变化最明显;采用硫黄硫化体系和酚醛树脂硫化体系制备的TPV性能优于过氧化物硫化体系,并且DCP和硫黄分别在用量为0.5份,酚醛树脂在1.0份时性能较佳。 相似文献
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用动态硫化法制备回收高密度聚乙烯(HDPE)/POE/NR热塑性弹性体,考察了不同橡塑比、POE和硫化剂用量对热塑性弹性体力学性能的影响,并通过电子扫描电镜观察了弹性体内部的微观结构。结果表明:橡塑比为50/50,POE用量为20 phr,硫化(剂硫黄)用量为2 phr时,弹性体综合性能较好。适量POE的加入,能改善橡塑两相间的相容性。 相似文献
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三元乙丙橡胶/聚丙烯动态硫化热塑性弹性体的相态结构 总被引:1,自引:1,他引:1
用扫描电镜研究了三元乙丙橡胶(EPDM)聚/丙烯(PP)动态硫化热塑性弹性体(TPV)相态结构的形成过程,探讨了交联密度、制备工艺、螺杆转速对EPDM/PP TPV相态结构的影响。结果表明,采用以酚醛树脂为硫化剂的动态硫化工艺制备的EPDM/PP TPV,其相态结构实现了由EPDM和PP组成的双连续相到以EPDM为分散相、PP为连续相的转变;当硫化剂用量为7份时,橡胶相硫化速率和交联密度最大;当螺杆转速为180 r/m in时,反应性挤出工艺较之密炼机工艺制备的EPDM/PP TPV的橡胶粒子更细小、分散更均匀。 相似文献
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EPDM/PP共混型热塑性弹性体的研制 总被引:15,自引:4,他引:11
采用动态硫化法在单螺杆挤出机组上制备了EPDM/PP共混型热塑性弹性体(TPV);采用力学试验、动态热流变试验等方法,研究了EPTM/PP共混型TPV的配方组成、熔融共混温度与性能的关系,提探讨了TPV配方设计机理。为TPV的投产与应用提供技术参数。 相似文献
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在开炼机上采用动态硫化的方法制备纳米SiO2改性三元乙丙橡胶(EPDM)/聚丙烯(PP)共混型热塑性弹性体(TPV),研究了纳米SiO2的加料顺序和用量对热塑性弹性体的力学性能、维卡软化温度的影响.并对改性后的TPV进行返炼.研究其热塑性能。结果表明:将纳米SiO2先与EPDM混炼均匀.然后加入其它助剂.制得EPDM母炼胶,再与PP共混制备得到的TPV力学性能较好,且纳米SiO2用量为4份时TPV的综合性能最佳;随着纳米SiO2用量的增加,TPV的维卡软化温度升高;返炼后的改性TPV力学性能稍有下降,但具有良好的热塑性。 相似文献
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The morphology and dynamic viscoelastic properties of isotactic polypropylene (PP) blended with oil-free/oil-extended ethylene–propylene–diene (EPDM) rubbers were studied. Unvulcanized and dynamically vulcanized blends with the compositions PP/EPDM = 50/50 and = 30/70 were investigated. The morphology was observed by phase contrasted atomic force microscopy. The dynamic viscoelastic properties were determined with a rheometer of plate–plate configuration. It was shown that the rheological behavior was strongly affected by both the composition and the morphology of the blends. Significant improvement in the flowability of the dynamically vulcanized blends was observed when oil-extended EPDM was used instead of the oil-free version. It was demonstrated that the rheological properties are mostly controlled by the elastomer phase at low frequencies, while in the high-frequency range the influence of PP becomes dominant. The peculiarities in the rheological behavior of the thermoplastic elastomers (uncured blends, TPE) and thermoplastic dynamic vulcanizates (TPV, dynamically cured blends) containing oil-extended EPDMs were traced to a limited compatibility between the PP and EPDM components in the melt. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献