Home – Home – Jornals – Chemistry for Sustainable Development 2022 number 2

Results of the studies of powder and structural composites (plates) based on low-density polyethylene (LDPE 15803-020 and LLDPE 6101RQ) and ultra-high molecular weight polyethylene (UHMWPE from Braskem company) and inorganic additives (SiC, TiO₂, CaCO₃, SiO₂) within concentration range 0.05-70 wt. % are presented. It is established that ultradispersed inorganic particles promote a decrease in the amount of the crystalline phase of polymers and an increase in wear resistance for the samples: UHMWPE (containing 7 wt. % SiC ( S _sp = 10 m²/g)) - by a factor of about 150; LDPE 15803-020 (20 wt. % SiC ( S _sp = 6-10 m²/g)) - by a factor of 2-2.5. For LLDPE 6101RQ samples with the low additive content (0.05-5 wt. % ТiО₂, SiO₂, CaCO₃), tensile strength increases by 7-24 %, мodulus of elasticity (along the axis) increases by a factor of 1.2-1.4, and relative elongation at fracture decreases within the range of 13.5-38.0 %. The maximal increase in tensile strength is observed for samples containing 20 wt. % SiO₂ and 50 wt. % ТiО₂ (by 38.5 and 43.6 %, respectively), while relative elongation at fracture decreases 2.8 and 3.9 times, and мodulus of elasticity increases by a factor of 1.9 and 2.0, respectively. Comparative data on the oxygen permeability of the plates, with different methods for the initial components’ mixing, show that samples prepared by mixing the polymer with inorganic additives in a mixer (the amount of additives 5 and 20 wt. %) gave a decrease in oxygen permeability within 5.6-11.2 %, while the samples prepared through mixing in a planetary mill activator, AGO-3, showed a decrease in oxygen permeability in the range of 16.8-28.7 %, compared to the original sample.