CHEMICAL INTERACTIONS OF ULTRAVIOLET-LIGHT WITH WOOL FIBER SURFACES

The surface compositions, chemistry, and wettability of wool fiber fab rics in both native and UV-exposed states have been investigated, X-ra y photoelectron spectroscopy shows surface oxygen levels of 10-12 at.% for native wool, which increase to as much as 27.5 at.% on UV exposur e. Investigation of C1s and S2p photo-electron line energies shows thi s increase to be due largely to oxidative cleavage of native disulfide bonds to form sulfonic acid groups together with some formation of CO OH/COOR on the wool fiber surfaces. A quantitative relationship is dem onstrated between surface chemical states and water wettability. (C) 1 997 Academic Press.