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1. Thermal sterilization of medical components made of polymers results in irreversible thermal oxidation as a result of the combined action of the high temperatures and the sterilization medium; this can lead to deterioration in the functionally important physicomechanical characteristics.

1. During cyclic compression caprolon loses load-carrying capacity solely due to softening from self-heating hysteresis. 2. During testing between force-transmitting pistons having good heat-conducting properties, the effect of convective heat exchange at the side faces on the heat removal from the testpiece is so slight that the thermal-fatigue limit is almost solely a function of its height (Eq. (1)). 3. On the basis of the data for the hysteresis of heat evolution in caprolon [7] Eq. (1) may be generalized with reasonable reliability to the case of various values of the frequency and cycle characteristics. 4. In determining the thermal-fatigue limit, the steady theory of thermal rupture provides a completely satisfactory means of allowing for the condition of heat removal from the ends of the testpiece.

The design of hollow bougies for treating cicatricial strictures of the esophagus along a rigid conductor, x-ray contrast polymeric materials for their manufacture, and the procedure of bougienage of cicatricial strictures of the esophagus with the use of hollow bougies and x-ray television were developed.

The feasibility has been established of using asphaltenes and tars for reducing the hydraulic drag in pipelines with a turbulent flow of crude oil.