By L. M. Khananashvili, O. V. Mukbaniani, G. E. Zaikov
New fields of technology and expertise demand new fabrics with worthwhile functionality features. long term resistance to such temperatures are available simply in polymers with chains made from thermostable fragments. rather attention-grabbing during this recognize are elementorganic polymers with inorganic and organo-inorganic molecular chains. Elementorganic polymers aren't in simple terms hugely thermostable, but additionally practice good less than low temperatures, sun, humidity, climate, and so forth. therefore, those polymers (especially silicones) are greatly and successfully utilized in undefined, radio, coal, mechanical rubber, airplane, metallurgical, cloth and different industries. they're of significant application not just in undefined, but in addition in families and in medication, the place their benefits can hardly ever be over priced. the necessity to post this ebook arose with the medical and technical advancements of the decade, the reconstruction and technical upkeep of latest factories, in addition to basic adjustments in a few syntheses of elementorganic monomers and polymers. additionally, these days it's necessary to teach highly-skilled chemical engineers with a accomplished wisdom of present chemistry, of the creation know-how of elementorganic monomers and polymers, and in their features and functions.
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Extra info for Elementorganic Monomers Technology, Properites, applications
At subsequent increase of copper content (more than 10%) the yield does not grow, whereas the product composition deteriorates due to the formation of compounds with high chlorine content (SiCI4, HSiCI3, RSiCI3). 1. Preparation of organochlorosilanes 29 reaction products. This seems to be due to copper shielding the surface of silicon. A similar situation is observed in the direct synthesis of ethylchlorosilanes. For the direct synthesis of phenylchlorosilanes, copper content in contact mass should be significantly bigger than for the synthesis of methyland ethylchlorosilanes.
1. Preparation of organochlorosilanes 41 flux the tower, and the rest is sent through cooler 29 into pressure container 30 of the third rectification stage. The third rectification stage. From pressure container 30 the mixture of 25-40% of methyltrichlorosilane and 60-75% of dimethyldichlorosilane is sent through heater 31 at 70-65 °C to the feeding plate of rectification tower 32. Dimethyldichlorosilane in the form of tank liquid flows into tank 33, where the temperature of 85-90 °C is maintained, and from there is continously poured into collector 34.
Thus, dimethyldichlorosilane is used in the manufacture of silicone liquids, elastomers and polymers for varnishes and plastics. Methyltrichlorosilane is used for producing silicone plastics and varnishes; methyldichlorosilane and trimethylchlorosilane are used to manufacture various silicone liquids. ). Tank residues mixed with methyldichlorosilane are used in the manufacture of silicone waterproofing liquids. Some physicochemical properties of methylchlorosilanes are given in Table 3. Preparation of ethylchlorosilanes The process of ethylchlorosilane preparation by copper-catalysed ethylchloride reaction with silicon is very complex, and the mechanism of this process has not been fully established.