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The thermo and radiation aging of polyolefins and their blends were studied. It was shown that near the inversion point of phase there is the most marked interaction between continuous and dispersed components of blend. This interaction results in an improvement of blend stability higher than expected. The investigation of the influence of supermolecular structure of PP stability revealed the small spherulite samples are more stable under irradiation in air than large spherulite ones. The possibility of obtaining composites of polyolefins and silicon liquids urns shown.

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