Acid hydrolysis of cellulosic fibres: Comparison of bleached kraft pulp, dissolving pulps and cotton textile cellulose. (20th January 2016)

• Record Type: Journal Article
• Authors: Palme, Anna; Theliander, Hans; Brelid, Harald
• Is Part Of: Carbohydrate polymers. Volume 136(2016)
• Page Start: 1281
• Page End: 1287
• Publication Date: 2016-01-20
• Subjects: Cotton -- Dissolving pulp -- Kraft pulp -- Acid hydrolysis -- LODP -- Hornification; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2015.10.015
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Acid hydrolysis rate was higher in once-dried Kraft pulp than in never-dried samples. Once-dried Kraft pulp samples had higher LODP values compared never-dried samples. PHK pulp had a lower LODP than sulphite pulp. Laundering of cotton cellulose textiles does not affect the LODP of the fibres. Abstract: The behaviour of different cellulosic fibres during acid hydrolysis has been investigated and the levelling-off degree of polymerisation (LODP) has been determined. The study included a bleached kraft pulp (both never-dried and once-dried) and two dissolving pulps (once-dried). Additionally, cotton cellulose from new cotton sheets and sheets discarded after long-time use was studied. Experimental results from the investigation, together with results found in literature, imply that ultrastructural differences between different fibres affect their susceptibility towards acid hydrolysis. Drying of a bleached kraft pulp was found to enhance the rate of acid hydrolysis and also result in a decrease in LODP. This implies that the susceptibility of cellulosic fibres towards acid hydrolysis is affected by drying-induced stresses in the cellulose chains. In cotton cellulose, it was found that use and laundering gave a substantial loss in the degree of polymerisation (DP), but that the LODP was only marginally affected.