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Polymers prepared from a polyether, 2,4-toluene diisocyanate, and octamethylcyclotetrasiloxane were studied using thermomechanical analysis, mechanical tests, and water vapor adsorption. The adsorption of nitrogen vapor was studied at 77 K, and that of water vapor, at 293 K.

The characteristics of the supramolecular organization of polyetherisocyanatesiloxanes are inferred from measurements of the temperature dependence of the dielectric loss tangent. It is shown that the mutual influence of macromolecular components on the formation of interpenetrating polymer network depends on the prescription and temperature conditions of synthesis.

Here, we present the results of the study of the interaction in the octamethylcyclotetrasiloxane-aromatic isocyanate-open coupling analogues system of crown ethers containing terminal hydroxyl and potassium alkoxide groups. It was found that the involvement of the organosiloxane cycle in the polymerization process precedes the opening of the isocyanate groups on the carbonyl component. It is shown that the formation of transverse cross-linking bonds in the polymer formation system is caused by the parallel reaction of cyclotrimerization. It is found that the ratio of the reaction rate constants of the copolymerization and the parallel reactions of cyclotrimerization and urethane formation depend on the synthesis temperature.