Degradation Mechanisms and Service Life Estimation of Polyurethane-Based Polymers in Aircraft Fuel Systems

Adva Cohen, IAF, Gadera, ישראל (advaziv@gmail.com)
Iddo Haran, Iaf, Gedera, ישראל
yonatan Ezra, Iaf, Gedera, ישראל
yotam levin, Iaf, Gedera, ישראל
anastasiya volison, Iaf, Gedera, ישראל

Enter the body of your abstract hereAircraft fuel systems play a crucial role in enhancing safety by preventing potential hazards. These systems often incorporate polyurethane-based polymers, which degrade over time, leading to alterations in their physical properties and a defined service lifetime. To assess the impact of aging, a chemical analysis was performed on materials that had been in service for 0, 5, and 10 years. Fourier-transform infrared (FTIR) spectroscopy was used to examine the chemical structure, revealing no significant changes in the core polymer matrix. However, the analysis showed a gradual shortening of the polymeric chains as the material aged. By applying Arrhenius equations and evaluating shifts in the glass transition temperature, the study estimated the effective service life of the polymer under typical operating conditions. These findings offer valuable insights into the degradation mechanisms of polyurethane materials and provide a foundation for strategies aimed at extending the operational lifespan of aircraft fuel systems