Figure 10
A line graph comparing property retention over aging time. The x axis represents aging time in days, ranging from 0 to 350 days. The y axis represents property retention in percentage, ranging from 88 to 100 percentage. The graph includes two data series: red dots representing independent literature data and a blue line representing PINN prediction. The data points show a downward trend, indicating a decrease in property retention over time. All values are approximated.Comparison between the proposed physics-informed neural network (PINN) predictions and independently reported thermo–oxidative aging data for PEEK at 453 K. The PINN was trained exclusively using the synthetic benchmark dataset described in Section 2 and evaluated against independent literature-reported experimental data without retraining or parameter adjustment. The comparison demonstrates good agreement between the predicted and experimentally observed degradation trends, with the PINN accurately capturing the overall monotonic reduction in property retention during thermo–oxidative aging