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二氧化硅填料与硅橡胶在热老化时的作用 总被引:2,自引:0,他引:2
本文研究了三种表面性质不同的二氧化硅填料与二甲基硅橡胶在热老化时的作用。使混炼胶和硫化胶分别在甲苯和甲苯-氨中溶胀,测定了结合胶及溶胀度的变化。证明在老化时填料和橡胶之间有数量可观的化学键生成,并且发生氢键向化学键的转化。填料表面经过化学处理或加结构化控制剂,对它和橡胶之间的氢键结合,化学反应均有一定的抑制作用。 相似文献
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由亚稳态铀原子用双色三光子电离光谱测量铀原子奇宇称高激发… 总被引:2,自引:2,他引:0
对铀原子单色和双色多光子共振电离光谱,进行了深入的研究。把亚稳态3800cm^-1做为起始,用双色三光子共振电离技术,在37900~83654cm^-1范围内获得了60个铀原子奇宇称高激发态能级的能位值和J值。 相似文献
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对铀原子单色和双色多光子共振电离光谱,进行了深入的研究。把亚稳态3800cm-1做为起始态,用双色三光子共振电离技术,在37900~38654cm-‘范围内获得了60个铀原子奇宇称高激发态能级的能位值和J值。 相似文献
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The fracture surfaces of a number of silicone vulcanizates were investigated by the use of scanning electron microscopy (SEM). It was found that the difference in the presence and absence of filler, the variation of its surface modification as well as the history of thermal aging of the vulcanizates, all of these factors made difference in surface morphology of the fractured surface. This was correlated with the strength of the vulcanizates. The reinforcing effect of filler and the process of fracture were discussed. 相似文献
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VULCANIZATION KINETICS OF SILICONE RUBBER 总被引:4,自引:0,他引:4
Vulcanization rate of silicone rubber with the aid of organic peroxide or hydrosilylation agent was studied by using oscillation disk rheometer. It was found that the process of network formation would take place through one, two or three steps depending on the structure of the reactants. The effect of phenyl group, vinyl terminals on polysiloxane chain and the functionality of silylation agent was also studied. 相似文献
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铀原子双色三步激光光电离光谱 总被引:1,自引:1,他引:0
对铀原子单色及双色多光子共振电离光谱开发了深入的研究,报道了用双色三步光电离技术测量位于34260-35800cm^-1范围内的奇宇称高位能级的位置和J值。 相似文献