А.N. Blaznov, М.Е. Zhurkovsky, V.V. Firsov, V.V. Samoilenko, N.V. Bychin, Е.V. Atyasova
DOI: 10.25699/SSSB.2019.27.37228 Download PDF
Abstract: This paper investigates an epoxy binder based on ED-20 resin and Etal-45M amine-type curing agent. The study was aimed at examining the physicomechanical and thermomechanical behavior of the binder specimens cured in different modes. Curing was performed in five different modes by varying holding time and temperature. The glass transition temperature was measured by TMA as per GOST 32618.2-2014, and polymerization degree and glass transition were determined by the DSC technique pursuant to GOST R 57687-2017 and GOST R 55135-2012, respectively; tensile strength was measured by GOST 11262-2017 and flexural strength by GOST R 56810-2015. As the temperature was raised from room temperature to 120 ºС and the curing time was increased, the degree of polymerization was found to rise to 99% and glass transition increased from 47 ºС to 86-93ºС. The strength of the specimens was initially rising, reaching the maximum of 52.1 MPa in tension and 94.3 MPa in flexure when the specimens were cured at 60 ºС / 4 h and 80 ºС / 2 h, and then declining as the temperature and holding time were raised. These curing modes are advisable for curing the studied binder based on epoxy resin and Etal-45M amine curing agent.
Index terms: epoxy binder, Etal-45М amine hardener, ТМА, DSC, strength, tension, three-point bending, glass transition, curing, degree of polymerization.


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