Effect of natural aging factors on physico-mechanical properties of compositions based on secondary polypropylene and triple ethylene-propylene-diene rubber
The article is devoted to the development of a polymer composite material with high physicо-mechanical performance indicators and weather resistance based on secondary polypropylene and triple ethylene-propylene-diene rubber. The use of secondary polypropylene in polymer composites in passing solves the problem of recycling secondary polymeric raw materials. To achieve this goal, we studied the efect of simultaneous action of the two most aggressive environmental factors (UV radiation and air oxygen), as well as natural aging on the physico-mechanical characteristics of composite materials based on secondary polypropylene and triple ethylene-propylene-diene rubber with diferent mass relationship. It was found that the introduction of triple ethylene-propylene-diene rubber in an amount up to 40% by weight. in polymer compositions based on secondary polypropylene, on the one hand, slightly reduces the depth of their photo-oxidative transformations as compared to unilled polypropylene, and on the other hand, allows to keep practically unchanged, and in some cases even slightly improve the deformation-strength characteristics (modulus of elasticity, rupture stress and burst elongation) of polypropylene materials with the prolonged exposure to UV radiation in air and in natural aging.