Figure 10
Evolution of the elemental atomic composition corresponding to the pad's material with respect to the exposure time. Panel (a) plots the number of each element – S (pink), C (red), O (green) and F (blue) – as a function of pad number, as expressed by its exposure time. Black points correspond to the non-damaged PFSA(1100) composition. Panel (b) plots the derived molecular weight of the formula unit of the ith pad (Mr·ai) with respect to exposure time. The color coding of points corresponds to the color of the boxes in Fig. 4(c). The arrow depicts the target molecular weight for non-damaged PFSA(1100). The solid curve is an exponential fit (see Section SI8). |