| Abstract:The fiber surface chemistry of eucalyptus chemithermomechanical pulp before and after fungal modification was studied with XPS. The results showed that the fungal modified CTMP fibers had a higher O/C ratio and lower C1 percentage than the control pulp fibers, and the C1s peak shifted to high binding energy direction. This implied that fungal modified fibers have less lignin and extractives, and more hydrophilic groups and carbohydrate on the fiber surface, which is helpful to hydrogen bonds forming. The XPS quantitative analysis of surface lignin and extractives contents showed that the surface lignin and extractives contents of fungal modified fiber decreased by 8.3% and 55.9%, respectively. However, the total lignin and extractives contents of fungal modified fiber decreased only by 2.5% and 11.1%, respectively. This indicated that the degradation of lignin and extractives mainly took place on fiber surface. |
