Abstract:

Abstract: White-rot fungus and poplar were selected as materials in this paper. Chemical composition and fiber morphology properties of poplar before and after fungus pretreatment were analyzed. The most suitable white-rot fungus and time for the next kraft pulping were probed. In these conditions, the poplar was made pulping, and the kappa number, the yield and viscosity of the pulp were measured. The physical properties of the paper were determined. The results showed that the level of lignin degradation of different fungus from high to low were：Lentinus edodes，Coriolus versicolor，Polystictus versicolor，Phlebia radiate，Pleurotus florida,and Pleurotus streatus. Lentinus edodes to holocellulose degradation was the highest and Polystictus versicolor was the lowest. After pretreatment,the average fiber length was reduced, and the ratio of the fiber length to width was increased,and the runkel ratio was decreased. Compared to the reference sample,results of pulping showed that after Phlebia radiata, Polystictus versicolor, and Pleurotus florida pretreatment, the kappa number was decreased, the pulp yield, viscosity and delignification selectivity were increased, the indexes of tensile and tear of the paper were improved. After Lentinus edodes pretreatment, the kappa number and delignification selectivity were decreased and increased, respectively, but the pulp yield and viscosity were decreased, the indexes of tensile and tear were reduced. After the four white-rot fungus pretreatment, the folding endurance and whiteness were increased.

Key words: Key words: poplar, white-rot fungus, kraft pulping, physical properties of paper