The effect of low-molecular polysulfones (oligosulfones) on the static and dynamic relaxation properties of epoxy polymers based on industrial resin ED-20 is studied. It is established that the modification of oligosulfones with terminal carboxyl, phenolic groups and a molecular weight from 1200 to 44500 leads to the formation of epoxy systems with higher performance in terms of development of static processes of creep and stress relaxation. It is demonstrated that the dynamic shear modulus increases with the introduction of the modifier. The magnitude of this effect is proportional to the molecular weight of oligosulfones. The intensities of the high-temperature α-transition at 390 K and the low-temperature β-transition at 208 K decrease with the introduction of the modifier. The improvement of the relaxation properties is associated with an increase in the density of the chemical grid of the epoxy matrix with the introduction of modifiers, its saturation with more rigid and heat-resistant component and the formation of additional intermolecular bonds between the components of the system
The influence of modifying additives of oligosulfones of different molecular weight with terminal carboxyl and phenolic groups on the physical and mechanical properties of epoxy polymers is investigated. It is found that the modification allows to increase the tensile strength by 32, the deformation at break by 85, the modulus of elasticity by 47 and the failure rate by 123 %. The maximum set of properties is realized when the epoxy polymer is introduced into the composition of 3–5 wt. с. of oligosulfone with a molecular weight of 4700. It is shown that the magnitude of the effect depends significantly on the amount of the modifier introduced and its molecular weight. The chemical nature of the end groups has little effect on the basic deformation and strength properties. The results of the work allow to recommend the studied oligosulfonsfones for the production of composite polymer materials of structural purpose with improved physical and mechanical properties on the basis of epoxy resins.
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