Study on improving reactivity of bamboo dissolving pulp by acid treatment
Acid treatment, including HCl and disodium edetate dihydrate (EDTA), sodium hexametaphosphate (SHMP), diethyl-enetriamine pentaacetic acid ( DTPA) , was applied to bamboo dissolving pulp. The effects of pH, processing time and chelating a-gent dosage on reactivity were investigated by analyzing the Fock reactivity, yield, ash content, brightness and degree of polymeriza-tion of the pulp. Pulp quality was further characterized in terms of specific surface area, pore structure, fiber morphology and molec-ular weight distribution ( MWD) by scanning electron microscope ( SEM) and gel permeation chromatography ( GPC) . The results showed that the optimum condition were to add 3.0% DTPA at the pH of 3.0, and cook for 45 min at 50℃, under which condition Fock reactivity increased from 67. 23% to 74. 12%. Meanwhile, fiber demonstrated a fluffier physical structure, with longitudinal split and fibrillation, which increased overall contact area. Cellulose molecular weight decreased and polydispersity index ( PDI) de-creased from 5.22 to 4.91, indicating more uniformed distribution of polymerization degree.
acid treatmentbamboo dissolving pulpreactivitypore structuremolecular weight distribution
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