Figure 6
The image contains five line graphs arranged in a grid. Each graph represents the concentration profile at different exposure times: 0 days, 7 days, 30 days, 120 days, and 365 days. The x-axis of each graph is labeled 'Depth (mm)' and ranges from 0.0 to 0.5 millimeters. The y-axis is labeled 'C (pred)' and shows varying concentration values. The graphs illustrate the gradual penetration of oxidative species from the exposed surface into the polymer thickness as aging progresses. The concentration decreases with depth in each graph, showing a trend of lower concentration at greater depths. All values are approximated.Predicted depth-resolved concentration profiles at selected exposure times (0, 7, 30, 120, and 365 days). The curves show the gradual penetration of oxidative species from the exposed surface into the polymer thickness as aging progresses