HIGHLIGHTS
SUMMARY
Polymeric composite materials (PCMs) based on glass, carbon, basalt, organic, and other fibers are widely used in various branches of mechanical engineering, and their strength characteristics decrease over time due to aging. An important regularity of the climatic aging of PCMs is the formation of gradients of mechanical parameters across the thickness of the plates. It was determined that in fiberglass based on DEN438 and EPON828, after 2 years of exposure in the tropics, the glass transition temperature Tg of the polymer matrix decreased by 37 ◦ C in the surface layer of the plates . . .
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