INFLUENCE OF OLIGOMERIC RUBBERS ON THE BEHAVIOR OF EPOXY COMPOSITIONS UNDER DYNAMIC CONTACT LOADING AND THEIR WEAR RESISTANCE
DOI:
https://doi.org/10.15421/jchemtech.v31i4.276862Keywords:
epoxy compositions, oligomeric rubbers, phase morphology, deformation energy components, active and passive phases of deformation, dynamic modulus of elasticity, wear resistanceAbstract
Aim. Comparative assessment of the influence of the chemical structure of oligomeric rubbers with reactive groups in the composition of protective wear-resistant epoxy compositions on the features of their phase morphology and deformation under the action of contact-dynamic loading, wear resistance. Methods. Optical microscopy to determine the phase morphology of modified epoxy compositions, size distribution of the heterophase (oligomeric rubbers) using the point method of Glagolev and linear Rosival, pulsed dynamic indentation, Maxwell and Kelvin-Voigt models to characterize viscoelastic properties. Results. The effect of oligomeric rubbers with reactive groups (carboxyl, hydroxyl, epoxy, acylhydrazone) on the behavior of epoxy compositions based on dian resin under contact-dynamic loading conditions has been determined, and extreme dependences of the active (embedding into the matrix) and passive (rebound from the surface) phases of the process on energy components of their deformation (elastic and viscous), which is associated with the formation of the phase morphology of compositions with different degrees of dispersity of the heterophase. It was found that the maximum wear and deformation of the modified epoxy compositions are related to their dynamic modulus of elasticity by straight-line relationships, the equations of which, using the experimental value of the maximum deformation, make it possible to predict the dynamic modulus of elasticity and, accordingly, the maximum wear of the compositions. The possibility of reducing (by 32 %) the maximum wear of an industrial epoxy composition highly filled with multidisperse silicon carbide with the introduction of oligomeric nitrile butadiene rubber with terminal carboxyl groups SKN-10 KTR was shown.
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