Vasylenko S. Thermal-physical, electrical-physical properties and relaxation processes in metalfilled epoxy polymers

In presented thesis the regularities of the conductive phase structure forming in polymer composites containing the conductive fillers are formulated. The correlation of structure organization with electrical, thermophysical and rheological characteristics of filled polymer systems is established. The results of the conductivity investigations of systems in dependence on the packing method of mixed metal fillers are generalized. The structural model for description of forming of the filler conductive phase is created. The equation including structural parameters of conductive phase is suggested for description of conductivity. Investigation of thermal-physical properties of the filled epoxy and epoxy-urethane composites has shown that an exfoliation of the glass transition process is a result of poor interaction of the polymer matrix with copper filler. In the case of iron and nickel filler the interaction polymer-filler is distributed in the entire polymer matrix. This fact allows us to rank the fillers Cu-Fe-Ni, where an activity of metal filler increases. The dynamical and static mechanical characteristics of metal filled epoxy composites depend on the type of filler and increase in the rank Cu-Fe-Ni that determines a presence of chemical interaction the epoxy resin - metal filler. The poor loose polymer layer exists near a surface of copper filler whereas strong coordination bond epoxy-filler exists in a case of nickel filler. The study of rheological properties of metal filled composites has shown that the calculations of viscosity in accordance with the Christensen's equation coincide with experimental data for all systems. Taking into account the value of packing-factor m enables to describe adequately the dependence of viscosity on the filler content. The thickness of boundary adsorbed layer of polymer on the surface of metal fillers is calculated. The contribution of polymer layer in the volume of polymer matrix is evaluated.