Organosilicon organosiloxanes

Besides HFC reaction of preliminarily prepared cyclic organosiloxanes with functional groups and difunctional organosilicon compounds, which give an opportunity to preserve cyclic groups in the polymeric backbone, hydride polyaddition is also widely used, which proceeds under soft conditions and does not involve cyclic structures, introduced into the backbone. 

Hydrosilylation of unsaturated organosilicon compounds has also found several applications in molecular and polymer organosilicon chemistry. In particular, the addition of polyfunctional silicon hydrides to poly(vinyl)organosiloxane, catalyzed exclusively by Pt compounds and providing an activated cure for silicon rubber [10], has been of great practical importance. Hydrosilylation of the vinyl group at silicon seems to be effective synthetic method for preparation of oligomers and polymers with a linear or cyclolinear stmcture (polyhydrosilylation), and can occur either via the addition of dihydro-carbosilanes and -siloxanes to divinyl-silanes and -siloxanes [25, 26] or by intermolecular hydrosilylation [4] (eq. (1)). 

The initial work on plasma polymerization of organosilicon compounds was done by Tkachuk et al.(6-8) who prepared siloxane and organosiloxane films under different processing conditions, and studied rates of deposition. The films were characterized by IR and ESR. Some of the more recent publications show that the plasma polymerization of organosilicon monomers yields films exhibiting excellent properties, such as high thermal stability ) and high dielectric constant.(10,11) Such films have found use as dielectrics for microelectronics, and in optical(12, 13) and biomedical applications.(14)... 

The more complex organosilicon compounds usually are derived from organohalogenosilanes as intermediates. Sil-anols may be made by hydrolyzing the corresponding halogenosilanes, and organosiloxanes result from the dehydration of silanols. Silylamines and silazanes result from... 

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