共查询到20条相似文献,搜索用时 78 毫秒
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采用3种不同混炼胶,通过化学发泡方法制作了硅橡胶海绵。分别比较了3种海绵的泡孔结构与密度、硬度、拉伸强度、压缩应力松弛、压缩应力应变性能。实验结果表明,混炼胶的性能、海绵的密度是影响海绵材料力学性能的重要因素。 相似文献
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采用模压一步法制备EPDM海绵。研究发泡剂品种和用量对其性能的影响。结果表明,以发泡剂AC,OBSH或H制备EPDM海绵,最佳用量分别为5,5和3份;发泡剂用量为5份时,以发泡剂H制备的EPDM海绵发泡倍率最大。以发泡剂AC/OBSH,AC/H或OBSH/H并用制备EPDM海绵,最佳并用量分别为5,4和2份;发泡剂并用量为5份时,以发泡剂AC/OBSH并用制备的EPDM海绵发泡倍率最大。扫描电子显微镜观察发现.以发泡剂AC/OBSH井用制备的EPDM海绵微孔分散均匀。 相似文献
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利用三维孔隙模型以及对应的三维网络模型获得的孔隙结构特征,构建孔隙圆盘模型,通过研究岩石孔隙结构对圆盘模型力学性能的影响来研究对岩石力学性能产生的影响。研究结果表明,在孔隙率出现变化时,会对模型的破坏产生影响,其孔隙率的大小,会对破坏力产生的原因有所影响;当孔隙密度出现变化时,参数的大小会对模型拉伸强度产生影响;而孔隙空间位置的变化对模型拉伸强度的影响较小。 相似文献
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国内硅橡胶泡沫材料的研究进展 总被引:2,自引:0,他引:2
综述了近年来硅橡胶泡沫材料的研究进展,重点从硅橡胶的补强和硅橡胶泡沫材料的硫化与发泡的特殊配合体系两个方面介绍了硅橡胶泡沫材料制备的特殊性。并指出高温硫化硅橡胶泡沫的研究将成为未来发泡硅橡胶材料的发展方向之一。 相似文献
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In this work, we first synthesized vinyl-terminated polyborosiloxane (pBS) filler, and then incorporated it into silicone rubber foam (SRF) matrix to prepare composite materials through a simple chemical dehydrogenative foaming method under ambient conditions. The pBS filler with reactive groups could form physical and chemical crosslinking networks in SRF, leading to an excellent dispersion level of pBS in the SRF matrix. Moreover, the inserted pBS could remarkably improve the mechanical and flame-retardancy properties of SRF-pBS composites. Intriguingly, the SRF-pBS6 foam containing 6 wt% of pBS possessed a uniform porous structure and balanced mechanical properties (σb = 65.4 kPa, εb = 56.7%, compression stress 97.1 kPa), thermal conductivity (0.102 W (m K)?1), limiting oxygen index (29.8%) and UL-94 rating (V-0) among the prepared foams. In addition, the incorporated pBS (6 wt%) could synergistically catalyze the formation of a silicon–boron strengthened ceramic-like protective layer under fire and was capable of suppressing heat and smoke production in the SRF-pBS6 foam. The present work provides a promising way for developing high mechanical and flame-retardant polymeric foam materials with good thermal insulation. © 2021 Society of Industrial Chemistry. 相似文献
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Silicone rubber foam was prepared through crosslinking with electron beam irradiation and foaming by the decomposing of blowing agent azobisformamide (AC) in hot air. The crosslinking and foaming of silicone rubber was carried out separately, which was different from the conventional method of chemical crosslinking and foaming. After foaming, the silicone rubber foam was irradiated again to stabilize the foam structure and further improve its mechanical properties. The effects of irradiation dose before and after foaming, and the amount of blowing agents on the structure and properties of silicone rubber foam were studied. The experimental results show that with the increase of AC content, the average cell diameter of silicone rubber foam increases a little, the foam density decreases to a minimum value when AC content is 10 phr. With the increase of irradiation dose before foaming from 10 to 17.5 kGy, the cell nucleation density of silicone rubber foam increases, the average cell diameter decreases, and the foam density increases. With the increase of irradiation before foaming, the tensile strength, tensile modulus, and the elongation at break of the silicone rubber foam increase. Through irradiation crosslinking again after foaming, the foam density is decreased and the mechanical properties of silicone foam are further improved. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献