摘要
聚甲基硅烷对氧气敏感,甚至能在空气中自燃。在较高的温度和湿度下,其Si—Si键和Si—H键不稳定,很容易被氧化成Si—O—Si。由于含有大量的Si—H键,120℃以上它会发生明显的脱氢交联反应,并且随着温度的升高,脱氢交联的速度明显增大。由于聚甲基硅烷热分解过程中低分子量组分的逸出,其陶瓷产率并不高,热分解产物为βSiC,其Si与C的摩尔比为1.23,并含有少量氧。
Polymethylsilane is sensitive to oxygen and pyrophoric sometimes. Si-Si bond and Si-H bond are not stable and can be oxidized into Si-O-Si under the condition of higher temperature and humidity. Because of the existence of plenty of the bonds of Si-H, polymethylsilane can be crosslinked from dehydrogenation above 120°C and the rate of dehydrogenation is increased with the increase of temperatures. Its ceramic yield is not high because low-molecular-mass volatile species are escaped from the system during pyrolysis. The pyrolytic products mostly are β-SiC microcrystalline, and the mole ratio of Si to C is 1.23 with a small amount of oxygen.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2004年第4期402-406,共5页
Journal of The Chinese Ceramic Society
基金
国防预研基金(01413120CCC)资助项目。~~
关键词
聚甲基硅烷
氧化反应
脱氢交联
热分解
Atmospheric humidity
Chemical bonds
Crosslinking
Dehydrogenation
Molecular weight
Oxidation
Polysilanes
Pyrolysis
Stability
