RESEARCH OF THE STRUCTURE OF EPOXY COMPOSITES BY OPTICAL MICROSCOPY AND IR-SPECTRAL ANALYSIS

Abstract

For the formation of polymer materials, the epoxy dian oligomer ED-20 was used, and its polymerization was performed using the amine hardener polyethylenepolyamine PEPA. The properties of epoxy composites were improved by using a mixture of discrete fibers based on polyester, viscose, and elastane, the content of which was varied within q = 0.25…2.00 wt.%. In this work, the nature of surface destruction in epoxy composites was investigated using optical microscopy, which enabled us to determine the interaction features between ingredients and the resistance of the developed materials to shock loads. Additionally, the interfacial interaction of the composite ingredients was investigated using the IR spectral analysis method. A change in the intensity parameters (T, %), relative peak area (S, %), as well as insignificant shifts in wave numbers (Δν, cm-1) was established, which corresponds to vibrations of the groups: -NН-, О-Н (ν = 3408 cm-1), С-Н, (ν = 2922…2848 cm–1), С=О (ν = 2019 cm–1), polyester component (ν = 1700 cm–1), С–О–С (ν = 1112…914 cm–1) and indicates structural transformations during polymerization of the composite ingredients.