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In the process of orientation the strength of polymeric materials changes as a result of a net increase in the number of ordered structural elements. It is shown that the model obtained can be used to predict the effect of orientation on the strength of polymers. The theoretical relations satisfactorily describe the available experimental data.

A study has been made of the viscosities of butadiene acrylonitrile rubber solutions and of the equilibrium swelling of vulcanizates of these rubbers with the same degree of crosslinking, in various solvents. It was found that the viscosity and light scattering characteristics of the solutions, and swelling of the vulcanizates of butadiene acrylonitrile rubbers are not steady functions of the degree of intermolecular interaction, represented by the difference of the square roots of the cohesive energy densities of the polymer and the solvent but pass through a maximum with variations in the polarity of the rubber.