Semynog V. Structure and physico-chemical properties of polymer composites based on modified polyolefins and functionalized liquid rubbers

The object of the study is the creation of modified polymer composites based on secondary polyethylene and disperse rubber crumbs in the presence of modifying additives and compatibilizers. The aim of the work is to search and synthesize new modifiers and compatibilizers, to develop methods of modifying secondary polyethylene with their use, to create polymer composite materials based on secondary polyethylene and rubber crumbs, to study the features of structure formation and their influence on the properties of the obtained materials. Main results were obtained using the methods of investigation such as: IR spectroscopy, pyrolytic mass-spectrometry, radiographic analysis, thermogravimetric analysis, differential scanning calorimetry, physical and mechanical tests. The method of mechanochemical modification in the melt of secondary polyethylene in the presence of small additives of hexamethylenetetramine, resotropin, and polymeric composites based on modified secondary polyethylene were developed for the first time. The mechanism of modifying effect of hexamethylenetetramine, resotropin on the chemical structure, structure and properties of secondary polyethylene was established for the first time. Method of obtaining oligodiene with blocked p-quinondioxime isocyanate groups has been developed and its effectiveness as a compatibilizer, its effect on the structure and properties of rubber-filled polymer composites based on secondary polyethylene have been established for the first time. Polymeric composite materials based on a system of partially functionalized poly(ethylene-vinyl acetate)-rubber crumb copolymer using oligodiene with terminal p-quinondioxime isocyanate groups as a compatibilizer were obtained for the first time. In the process of forming polymeric composite materials, it was found that the oligodiene interacts with the functional groups of both a rubber crumb and a hydroxyl-containing poly(ethylene-vinyl acetate), improves the combination between the components and significantly improves the physical and mechanical characteristics of the composites. New composite polymeric materials with improved performance have been developed. The results of the research showed the perspective of their use as insulation, sealing, waterproof materials, seals, technical products for mechanical engineering, coatings for sports grounds and in other industries and life.