Kuryptya Y. Electrically conductive polymeric hybrid composites technology development

The thesis is dedicated to the technology of electrically conductive hybrid polymer composites based on following polymeric matrixes: linear polyethylene, emulsion polyvinyl chloride, polypropylene, polyethylene terephthalate glycol modified, polycarbonate and acrylonitrile butadiene styrene plastic. Conductive fillers such as graphite - carbon black, nickel powder, chopped carbon fiber, chopped copper fiber was formulated in to hybrid filler with different fillers type - fiber and particle with different proportions and was introduces in the different polymer matrixes by extrusion compounding process. The influence of hybrid polymer composite type and proportion on electrical, mechanical, rheological and structural properties was established. The rational composition hybrid polymer composites with different polymer matrixes was chosen for the possible applications as antistatic and static dissipative material, conductive and electromagnetic shielding material, electrically conductive materials was tested for low voltage heating elements. Polymer matrix was modified by introduction of propylene octane copolymer and polyethylene maleic anhydride graft copolymer which results in advanced mechanical and electrical properties. Different types of extrusion compounding equipment including single screw extruders and twin screw extruders with different mixing quality was studied with point of view of resulting electrical properties. Electrical properties of hybrid composites was studied during extrusion processing in melt stage by using specially designed measuring sell, results can be used for compounding process quality control. The technological process of production hybrid composites by premix and split feed compounding was described for optimal and best performance compositions, combined with results of industrial assessment and trials tests.