Variations in carbohydrates molar mass distribution during chemical degradation and consequences on fibre strength
Source abstract
Abstract
Abstract Industrial oxygen-delignified and fully-bleached hardwood kraft pulps were treated with chemicals to provoke carbohydrates depolymerisation: ozone, hypochlorous acid, and cellulase. The degrees of polymerisation (DP) of cellulose obtained by pulp viscosity measurement in Cuen and by size-exclusion chromatography after direct dissolution in DMAc/LiCl indicated the extent of the chemical degradation inflicted to the fibres. Molar mass distributions (MMD) described the carbohydrates depolymerisation patterns. Fibre strength was assessed by measuring the zero-span tensile index at never-dried state. Fibre strength deterioration seemed to be mainly driven by the topochemistry of the cellulose degradation (homogeneous or localised), rather than by its intensity usually measured as an average DP loss. In fact, depolymerisation by cellulase was found critically detrimental to fibres strength whereas ozone and hypochlorous acid induced little harm to the fibres despite a significant cellulose depolymerisation. According to these results, in line with several past studies, fibre strength measurements should be performed systematically as the sole pulp viscosity is an inadequate indicator. Alternatively, albeit being insufficient strength predictors on their own MMD can give valuable insight on the topochemistry of the cellulose degradation, a key aspect when monitoring fibre strength preservation during pulping and bleaching.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Food composition and properties · Advanced Cellulose Research Studies · biodegradable polymer synthesis and properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Univ. Grenoble Alpes, CNRS, Grenoble INP (Institute of Engineering Univ. Grenoble Alpes), LGP2 , 38000 Grenoble , France
The French Agency for Ecological Transition (ADEME) , 20, Avenue du Grésillé, BP 90406, 49004 Angers Cedex 01 , France
Institut Polytechnique UniLaSalle, Université d’Artois, ULR 7519 , 19 Rue Pierre Waguet, BP 30313, 60026 Beauvais , France
Funding
Fibre Excellence · Agence de la transition écologique · Xylem Inc.
References (45)
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