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    • 6. 发明授权
    • Low viscosity, crosslinkable liquid polysilanes
    • 低粘度,可交联液体多晶硅
    • US5091485A
    • 1992-02-25
    • US469024
    • 1990-01-23
    • Patrick NoireauxJean JametMichel ParlierMarie-Pierre Bacos
    • Patrick NoireauxJean JametMichel ParlierMarie-Pierre Bacos
    • C04B35/571C08G77/48C08G77/60
    • C08G77/60C04B35/571
    • Low viscosity, crosslinkable polysilanes that are liquid at ambient temperatures and essentially free of volatiles, well adapted for conversion into silicon carbide ceramics at elevated temperatures, are prepared by (a) reacting at least one silane monomer of the formula (1):R.sup.1 R.sup.2 SiCl.sub.2 (1)in which R.sup.1 is a hydrogen atom or a hydrocarbon radical and R.sup.2 is a vinyl radical, with at least one organic or organosilicon monochlorinated comonomer, in the presence of molten sodium in an organic solvent and wherein the ratio r.sub.1 of the number of moles of the silane monomer of formula (1) to the number of moles of the monochlorinated comonomer ranges from 0.5 to 2 and the solvent includes toluene and dioxane, (b) cooling the reaction medium and separating it, characteristically by filtration, into (i) a liquid phase which includes such solvent and the major fraction of low molecular weight polysilane in liquid and/or dissolved state and (ii) a solid phase which includes sodium, sodium chloride and high molecular weight polysilane, and (c) recovering desired low viscosity polysilane from such liquid phase and preferably oxidizing the sodium present in the solid phase.
    • 通过(a)使至少一种式(1)的硅烷单体:R1R2SiCl2(其中, 1)其中R1是氢原子或烃基,R2是乙烯基,与至少一种有机或有机硅一氯化共聚单体在熔融钠存在下在有机溶剂中反应,并且其中摩尔数的摩尔比r1 式(1)的硅烷单体与单氯化共聚单体的摩尔数的范围为0.5-2,溶剂包括甲苯和二恶烷,(b)冷却反应介质并通过过滤将其分离成(i) 包括这种溶剂的液相和液态和/或溶解状态的低分子量聚硅烷的主要部分和(ii)固相,其包括钠,氯化钠和 高分子量聚硅烷,和(c)从这种液相回收所需的低粘度聚硅烷,优选氧化固相中存在的钠。