Structural changes proceeding in composites under the effect of various mechanical deformations (stretching, compression, shear, etc.) affect the structure of an electrical conducting system. Mechanical stresses, induced by deformation of composite materials during deformation, affect both the molecular and supermolecular structure of polymers. As a consequence, they also affect a substructure bound to it and composed of filler particles. It is evident that in the case of conducting polymer composites, mechanical deformations should reflect electric conductivity of materials. Key words: mechanical deformations; macromolecules; electric conductivity; polymers ELECTRIC CONDUCTIVITY OF CARBON BLACK-FILLED RUBBERS UNDER STRETCHING DEFORMATIONSMechanical deformations that initiate intertransformations of macromolecules can affect the topology of conducting particles interacting with macromolecules. Many works have studied connections between structural features of composites and their electric conductivity at deformation.

The reaction of dehydrocondensation of a,o-bis(trimethylsiloxy)methylhydridesiloxane (n % 53) with allyl alcohol at various ratios of initial compounds, in the presence of anhydrous powders like caustic potassium and platinum chlorohydric acid has been investigated. It was established that in the presence of caustic potassium dehydrocondensation reaction takes place and methylsiloxane oligomers with allylic groups in side chain have been obtained. In the presence of platinum chlorohydric acid competetive dehydrocondensation and hydrosilylation reactions take place with formation of oligomers with various chain links. In late stages of the reaction three-dimensional systems were obtained. During dehydrocondensation the reaction order, reaction rate constants and activation energy were found. The structure of the synthesized oligomers were determined by IR and NMR spectra data. Gel permeation chromatography, differential scanning calorimetric and X-ray analysis of the synthesized oligomers were carried out.

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