Investigation of Strength of Polymer Matrix under the Influence of Temperature Time Factor

BACKGROUND: The widespread use of polymer composite materials (PCM) in the shipbuilding industry necessitated the study of the physical and mechanical properties of PCM, including under the influence of temperature time factor, which are important and timely. This is further supported by the need to improve the technology of using polymers in the form of thin antifriction coatings in critical machines. AIM: To investigate the strength of polymer matrix under the influence of temperature time factor by preparation of materials and samples for experiments; study of changes in the polymer matrix at different composite sintering temperatures; study of the synthesis (growth) of polymer strength; building mathematical models of polymer strength growth at different temperatures from 200 to 350 °C; study of the polymer strength loss (destruction). METHODS: PA-6/66-3 polyamide, which has been in high demand lately, was selected for the study. Both theoretical research methods and empirical ones were used, including high-tech experiments using digital technologies and processing using CAE software. RESULTS: It was found that the sintering temperature of a polymer determined the strength growth rate and the dependence of the strength growth rate on temperature was linear. Dependence graphs of the tensile strength and the sintering time at various temperatures are shown and experimental curves are approximated. It was revealed that the polymer thermal degradation proceeded up to the specified tensile strength and had a pronounced inflection point. CONCLUSION: The study shows that the law of strength growth (synthesis) can be represented as a linear dependence on the sintering temperature of the samples. We can conclude that the coefficients in the equation of the direct rate of strength growth depend significantly on the melting point. The study allows us to make recommendations on improving the manufacturing technology of dispersed polyamide products.