Термодеформационные характеристики нанокомпозитов на основе полипропилена и термозолы бытовых отходов

Abstract

The paper presents the results of a study of the influence of the concentration and particle size of the filler on the thermomechanical properties of composite materials based on polypropylene and waste from waste processing industry (thermal ash). Three grindings of thermal ash were used with particle sizes: 90 nm, 300 – 500 nm and 1200 – 2000 nm. It has been established that with an increase in the size of thermal ash particles, the deformation curve in the region of the viscous-flow state shifts to the region of high temperatures. As a compatibilizer used functionalized with 5.6 wt. % maleic anhydride polypropylene grade Exxelor PO1020 to improve miscibility and compatibility of non-polar polypropylene with thermal ash particles. It is shown that the introduction of different amounts of the cross-linking agent dicumyl peroxide contributes to a significant change in the pattern of deformation of nanocomposites with temperature. The concentration of dicumyl peroxide was varied within 0.25 – 2.0 wt. %. Peroxide crosslinking using 0.25 – 0.5 wt. % dicumyl peroxide contributed to the appearance of a region of highly elastic deformation on composites with 5.0 and 40 wt. % thermal ash. With an increase in the concentration of dicumyl peroxide over 0.5 wt. % vitrification of nanocomposites was observed. In this state, the samples are completely crosslinked and pass into the infusible state. Such an infusible state is highly undesirable since it is not possible to process them by injection molding and extrusion.