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(一) 本文叙述了甲基氯硅烷混合单体气相醇解,发现所用无水乙醇以过量2%为最宜,并试出乙醇的含水量愈少,所得之烷基取代酯产率愈高。(二) 提出了甲基乙烯基二乙氧基硅烷的两种合成方法:(1)将乙烯基三氨硅烷进行氣相醇介,得几近定量产率的乙烯基三乙氧基氧烷,然后再以·CH_3MgBr行甲基化,(2)利用Nor mant所改进的格氏反应将甲基三乙氧基硅进行乙烯基比,同样获得(CH_3)(CH_2=CH)Si(OC_2H_5)_2.惟产率较低。(三) 将二甲基二乙氧基硅与0.18—3%的(CH_3)(CH_2=CH)Si(OC_2H_(?))_2共水解,并在H_2SO_7(70%)介质中进行聚合,得乙烯基硅橡胶。用黏度法测定其分子量约为70万。
(A) This article describes the methyl chlorosilane mixed monomer vapor phase alcoholysis, found that the excess of ethanol used in excess of 2% is the most appropriate, and try the less water content of ethanol, the higher yield of alkyl substituted esters . (B) Two synthetic methods for methylvinyl diethoxysilane are proposed: (1) Vapor-phase alcoholysis of vinyltrisilanes to give almost quantitative yields of vinyltriethoxy-oxygen (CH3) (CH2 = CH) Si (OC2H5) was obtained by methylation of CH3CH3MgBr, (2) methyltriethoxysilane was vinyl-modified by Grignard reaction modified by Normant ) _2. But yield is low. (C) Dimethyldiethoxysilicon is co-hydrolyzed with 0.18-3% (CH_3) (CH_2 = CH) Si (OC_2H_ (?)) _2 and polymerized in H_2SO_7 Vinyl silicone rubber. The viscosity of the molecular weight of about 700000.