ИССЛЕДОВАНИЕ ФИЗИКО-МЕХАНИЧЕСКИХ СВОЙСТВ КОМПОЗИТОВ С ПОЛИМЕРНОЙ ФАЗОЙ ПОЛИЛАКТИДА И КОСТРОЙ КОНОПЛИ

Abstract

As a result of the study the indicators of key physical and mechanical properties and biodegradation potential of composites with polymer phase of polylactide and technical hemp shives were determined, the properties of composites based on polylactide with technical hemp shives and reference materials with wood flour were compared. It is established that composites with hemp shives demonstrate on the average higher values of density, Shore hardness and bending strength, as well as lower water absorption at higher values of the wetting angle. The stiffness of samples with hemp shives practically does not change when the filler content is increased up to 30 wt. %, and increases with further increase in the degree of filling. The impact toughness of composites with hemp shives significantly exceeds the parameters of analogs based on polylactide and wood flour. In addition, the increase in the content of hemp shives, in contrast to technical wood flour, has practically no negative effect on the impact toughness of composites. Introduction of wood flour into the composition of polylactide leads to a sharp increase in water absorption, while the water absorption of samples with hemp shives does not exceed 2% regardless of the degree of filling. Replacement of wood filler with hemp shives in the composition of the composite leads to a significant decrease in the mass loss index after aging in the active soil for 30 days. In general, composites with polylactide polymer phase and hemp shives are superior to analogs with wood flour in terms of physical and mechanical properties. Lower biodegradation potential can be both an advantage and a significant disadvantage for composites with technical hemp shives.