Solovko I. Technological methods of production of mono and reinforced casting polystyrene foam models using physical methods of heat treatment

Scientific work investigation object is polystyrene heat - treating process with applying of new phish cal processes of pre-expanding and expanding (high-frequency fields, ultra-violet fields, liquid high-temperature carriers, alloying dispersive additives) for production of high-quality casting mono- and reinforced polystyrene models, and castings with new functional properties made of them. Aim of scientific work is evaluation of influence laws of main time-temperature and energetic parameters heat-weight processes under pre-expanding polystyrene granules HFEF, UV, and expanding HTC, development and realization of technological processes mono- and reinforced polystyrene models by heat-treating in high-frequency current HFEF, in ultra-violet beam UV and in liquid high-temperature carriers HTC, inclusive applying of alloying , reinforcing additives on the polystyrene granules surface, production of casting polystyrene models in HTC. This thesis presents the technologies to produce mono and reinforced casting polystyrene foam models, optimisation of physical methods of polystyrene particles foaming and sintering with the present of high frequency electric field (HFEF), high temperature liquid conductors (HTC), ultraviolet light (UV), dispersed alloying additives (DAA). New methods of foaming and sintering of polystyrene particles for foam casting were examined. Heat and mass transfer experiments of foaming and sintering of polystyrene particles with HTC, UV and HTC were performed. These experiments shown that different mechanisms of heat transfer between heat media and polystyrene particles had taken place. An impact between reinforced polystyrene particles, its product of degradation and liquid metal was analysed. It was established that high thermal conductivity of reinforced particles increased degradation level of the foam. Mass and heat transfer in the presence of high frequency thermal field was also established. The effects of heat source on polystyrene particles and process parameters were analysed. Patterns of influence of high temperature liquid conductors (at temperature 100 - 160 0С) on kinetic, time dependant properties and quality of sintering and foaming were investigated. It was established that the main parameters of heat transfer between HTC and polystyrene particles were liquid conductor temperature and time of reaction. It was shown that modern physical method of foaming and sintering of polymers could be used for the developing of energy safe technology. New physical methods can increase the spectrum of polymers that could be used for the foam casting; can selectively improve local casting quality. It is easier to design automotive production lines and control general quality of the casting with new method of sintering and foaming for the foam casting.