BRIGHTNESS REVERSION OF MECHANICAL PULPS PART XIII: PHOTOINDUCED DEGRADATION OF LIGNIN ON CELLULOSE MATRIX

摘要

An acidic dioxane extraction procedure was employed to isolate lignin from softwood bleached chemithermomechanical pulp (BCTMP). The isolated lignin was characterized spectroscopically and applied on cellulose test sheets. The treated cellulose test sheets were shown to exhibit photoyellowing properties Comparable to those of BCTMP. The photolyzed lignin was re-isolated and Characterized using spectroscopic techniques.