XPS studies of radiation grafted PTFE-g-polystyrene sulfonic acid membranes

Structural investigations of PTFE-g-polystyrene sulfonic acid membranes pre pared by radiation grafting of styrene onto PTFE were conducted by X-ray ph otoelectron spectroscopy (XPS). The analyzed materials included original PT FE film as a reference material, grafted film, and sulfonated membrane samp les having various degrees of grafting. Interest is focused on C1s, F1s, O1 s, and S2p of narrow XPS spectra as the basic elemental components of the m embrane, The original PTFE film was found to undergo structural changes in terms of chemical composition and shifting in binding energy induced by inc orporation of sulfonated polystyrene grafts, and the amount of such changes depends on the degree of grafting. The atomic ratio of F/C was found to de crease with the increase in the degree of grafting, while that for S/C and O/C were found to increase. (C) 2000 John Wiley & Sons, Inc.