Evaluation of residual cross-linking caused by selfheating effect in epoxy-based fibrous composites Rusing Raman spectroscopy
Journal Title: CHEMIK nauka-technika-rynek - Year 2014, Vol 68, Issue 11
Abstract
Mechanical cyclic loading of polymeric structures causes dissipation processes, which introduce the self-heating effect, i.e. the local temperature increase equivalent to the stress gradient. In some specific cases of fatigue loading the self-heating effect dominates the process and intensifies the structural degradation. Previous studies in this area show that the heating-up is connected with residual cross-linking of epoxy groups (EP) in the fibrous composites. The purpose of the presented study is an evaluation of degree of residual cross-linking and an analysis of Raman spectra with temperature profiles and characteristic temperatures of EP-based fibrous composites subjected to the fatigue loading with occurrence of the self-heating effect. The characteristic bands in Raman spectra as well as characteristic temperature history curves and their dependence on the excitation frequency were investigated. Obtained results allow for the characterization of degradation mechanisms of EPbased fibrous composites under thermal fatigue.
Authors and Affiliations
A. Katunin, K. Krukiewicz, R. Turczyn
Keywords
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