Deformation Properties of Polyethylene Film Under Mechanical Impact

Аннотация

The research results for the mechanical and deformation properties of the film made of low molecular weight polyethylene produced by the Shurtan gas chemical complex (Republic of Uzbekistan) are presented. When used as a printed material, the polyethylene film falls under the influence of small tensile forces in the printing process, as a result, the physical state of the film’s polymer is rearranged, which leads to deformation. To predict the film behaviour during printing, the ultimate tensile strength of the material, the relative elongation at rupture and the initial modulus of elasticity, characterizing the reversibility of the deformations, are determined. The mechanical and deformation properties of the film were determined to reveal the nature of deformation of the film during printing on a tensile machine. Based on the results of static tensile tests, load-relative elongation curves were plotted. The modulus of elasticity, which characterizes the material rigidity degree, was calculated on the basis of Hooke’s law. The infrared spectroscopy method was used to identify polymer films and to perform their structural analysis. Infrared spectroscopic analysis revealed that the films under research correspond to low density polyethylene (LDPE) film in terms of its physical structure. Tensile strength and modulus of elasticity of polyethylene film characterize the elastic deformation of a fully oriented sample and the ability to elastic recovery, the knowledge of which helps to predetermine the deformation when printing with the use of graphic arts and packaging equipment.