Аннотация:The modification of epoxyurethane-containing isocyanate polymers of a network structure was performed due to variations in the curing temperature and the ratio of diol,diisocyanate components and epoxy resin. When the reaction systems are cured below 100oC,the polymers contain a large number of flexible chain structures and pass into the rubbery stateat ~60oC. An increase in the processing temperature above 120oC leads to a significant change in the composition, which affects the properties of the resulting systems, the glass transition temperature of which increases in the limit to 225oC. An experimental change in the elastic modulus associated with an increase in the curing temperature from 80 to 200°C was found. At the processing temperature of 120oC, the Sol fraction content in the samples is decreased and the gel fraction is increased. Yield strength increases by 48%, modulus of elasticity by 107%, Brinell hardness by 40%, Shore hardness by 20 %. The glass transition temperature increases to 225oC.