**2.2 Dynamic mechanical properties of corroded polymer specimens**

Dynamic mechanical analysis (DMA) was used to investigate the viscoelastic properties of the exposed polymer samples as reported in our previous study [30]. The frequencies under which DMA measurements were made in this study are: 2, 5 and 10 Hz. The loss and storage moduli at low temperatures where polymer molecules are tightly compressed and where the first solid-state transitions occur were analyzed.
