Effect of UV radiation on the carbonyl distribution in different pulps
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Antje Potthast
Abstract
The effect of UV irradiation on unbleached and TCF-bleached dissolving pulp samples of different provenience, a beech sulphite and an eucalyptus prehydrolysis kraft pulp, has been analyzed according to the CCOA method, evaluating the changes in the molecular weight distribution, the total number of carbonyl groups and the carbonyl group profiles of each pulp. In the case of TCF bleached material, slightly more carbonyl groups were introduced into the kraft pulp as compared to the sulfite pulp. Cellulose degradation was relatively low in both pulps.
In the case of unbleached sulfite pulps, the residual lignin had only a minor effect on the molecular weight distribution and the oxidation state of the cellulose, whereas for eucalyptus kraft pulp a pronounced introduction of carbonyl groups accompanied by severe degradation of cellulose was observed. The presence of hemicelluloses governed the photochemical behavior and the carbonyl profiles of the low molecular weight region of the cellulose.
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© Walter de Gruyter
Artikel in diesem Heft
- Subject Index
- Contents
- Species Index
- Author Index
- Monoethanolamine (MEA) pulping of beech and spruce wood for production of dissolving pulp
- Voltammetric analysis of the bleachability of softwood kraft pulps
- Alkaline degradation of model compounds related to beech xylan
- Effect of UV radiation on the carbonyl distribution in different pulps
- Changes in the lignin-carbohydrate complex in softwood kraft pulp during kraft and oxygen delignification
- Carbohydrate structures in residual lignin-carbohydrate complexes of spruce and pine pulp
- Ozonation of pine kraft lignin in alkaline solution. Part 1: Ozonation, characterization of kraft lignin and its ozonated preparations
- Ozonation of pine kraft lignin in alkaline solution. Part 2: Surface active properties of the ozonated kraft lignins
- Lignin reactions in oxygen delignification catalysed by Mn(II)-substituted molybdovanadophosphate polyanion
- Bioactive phenolic substances in industrially important tree species. Part 2: Knots and stemwood of fir species
- Evaluation of hydrocarbon emissions from heart- and sapwood of Scots pine using a laboratory-scale wood drier
- Effect of pulsating tension-torsion combined loading on fatigue behavior in wood
- Effects of density and microfibril orientation on the vertical variation of low-stiffness wood in radiata pine butt logs
- Determination of the natural durability of larch wood (Larix decidua Mill.) from the Western Italian Alps
- High-performance liquid chromatographic analysis of soluble and total oxalate in Ca- and Mg-amended liquid cultures of three wood decay fungi
- Artificial weathering of tropical woods. Part 1: Changes in wettability and Artificial weathering of tropical woods. Part II: Color change
Artikel in diesem Heft
- Subject Index
- Contents
- Species Index
- Author Index
- Monoethanolamine (MEA) pulping of beech and spruce wood for production of dissolving pulp
- Voltammetric analysis of the bleachability of softwood kraft pulps
- Alkaline degradation of model compounds related to beech xylan
- Effect of UV radiation on the carbonyl distribution in different pulps
- Changes in the lignin-carbohydrate complex in softwood kraft pulp during kraft and oxygen delignification
- Carbohydrate structures in residual lignin-carbohydrate complexes of spruce and pine pulp
- Ozonation of pine kraft lignin in alkaline solution. Part 1: Ozonation, characterization of kraft lignin and its ozonated preparations
- Ozonation of pine kraft lignin in alkaline solution. Part 2: Surface active properties of the ozonated kraft lignins
- Lignin reactions in oxygen delignification catalysed by Mn(II)-substituted molybdovanadophosphate polyanion
- Bioactive phenolic substances in industrially important tree species. Part 2: Knots and stemwood of fir species
- Evaluation of hydrocarbon emissions from heart- and sapwood of Scots pine using a laboratory-scale wood drier
- Effect of pulsating tension-torsion combined loading on fatigue behavior in wood
- Effects of density and microfibril orientation on the vertical variation of low-stiffness wood in radiata pine butt logs
- Determination of the natural durability of larch wood (Larix decidua Mill.) from the Western Italian Alps
- High-performance liquid chromatographic analysis of soluble and total oxalate in Ca- and Mg-amended liquid cultures of three wood decay fungi
- Artificial weathering of tropical woods. Part 1: Changes in wettability and Artificial weathering of tropical woods. Part II: Color change
