Improvement of Reactivity of Viscose-grade Dissolving Pulp by Cellulase Treatment

Key Words:viscose  dissolving pulp  reactivity  viscosity  specific surface area

Abstract:

      The cellulase was used to treat the viscose-grade dissolving pulp. The effect of enzymatic treatment on the reactivity, viscosity, fiber morphology, degree of crystallinity, pore diameter and specific surface area of the pulp was investigated. The fiber surface morphology was also observed by scanning electron microscope. The results showed that the reactivity of dissolving pulp could be obviously improved by cellulase treatment. The optimized treatment process was as follows: enzyme dosage 0.08 IU/g o.d. pulp, treating time 15 min, temperature 55℃, and pH value of 5.0. Under the optimized conditions, the Fock reactivity was increased by 27.6%, and the viscose filtering perfor-mance was improved from no pass to successful pass. Compared with the control sample, enzymatic treatment led to the slight decline of viscosity of the pulp and molecular weight of cellulose, and the pore diameter and specific surface area of dissolving pulp fiber increased dramatically. The peeling phenomenon and pores on the fiber surface were also clearly observed, but the fiber morphology was basically unchanged.