Environmental conditioning. Prior to mechanical testing, the specimens were exposed to various environmental aging conditions. Some specimens were conditioned inside an oven in a “dry” environment, i.e., without prescribed RH levels, at various temperatures: 21°C (D21), 62°C (D62), 82°C (D82), 90°C (D90), 118°C (D118) and 150°C (D150). D62 and D118 temperatures correspond to
