The effect of cellulose degradation on the strength of wood pulp fibres

Gurnagul, N.; Page, D. H.; Paice, Michael G.

doi:10.3183/npprj-1992-07-03-p152-154

Cited by 87 publications

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“…It has been shown in a previous study that during enzymatic hydrolysis pulp fibres preferably scission at dislocations, which have a typical distance of about 20 lm along the fibre (Thygesen et al 2011). It has been concluded from some studies that fibres derived from various sources were more hydrolysable at dislocations (BuschleDiller et al 1994;Clarke et al 2011;Gourlay et al 2015;Gurnagul et al 1992). We did not observe faster hydrolysis perpendicular to the long axis of the Fibre, which would have indicated the presence of dislocations.…”

Section: Resultsmentioning

confidence: 99%

Visualization of structural changes in cellulosic substrates during enzymatic hydrolysis using multimodal nonlinear microscopy

et al. 2016

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Enzymatic hydrolysis of cellulose provides a renewable source of monosaccharides for production of variety of biochemicals and biopolymers. Unfortunately, the enzymatic hydrolysis of cellulose is often incomplete, and the reasons are not fully understood. We have monitored enzymatic hydrolysis in terms of molecular density, ordering and autofluorescence of cellulose structures in real time using simultaneous CARS, SHG and MPEF microscopy with the aim of contributing to the understanding and optimization of the enzymatic hydrolysis of cellulose. Three celluloserich substrates with different supramolecular structures, pulp fibre, acid-treated pulp fibre and Avicel, were studied at microscopic level. The microscopy studies revealed that before enzymatic hydrolysis Avicel had the greatest carbon-hydrogen density, while pulp fibre and acid-treated fibre had similar density. Monitoring of the substrates during enzymatic hydrolysis revealed the double exponential SHG decay for pulp fibre and acid-treated fibre indicating two phases of the process. Acid-treated fibre was hydrolysed most rapidly and the hydrolysis of pulp fibre was spatially non-uniform leading to fractioning of the particles, while the hydrolysis of Avicel was more than an order of magnitude slower than that of both fibres.

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Section: Resultsmentioning

confidence: 99%

Visualization of structural changes in cellulosic substrates during enzymatic hydrolysis using multimodal nonlinear microscopy

et al. 2016

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“…The effect of lignin on tensile strength and tensile stiffness of paper sheets has been reported (Risen et al 2004;Neagu et al 2006). The correlation between the cellulose degradation and fiber strength has also been discussed (Gurnagul et al 1992;Joutsimo et al 2005).…”

Section: Introductionmentioning

confidence: 97%

Correlation Analysis for Fiber Characteristics and Strength Properties of Softwood Kraft Pulps from Different Stages of a Bleaching Fiber Line

Lin¹,

He²,

Liu³

et al. 2014

BioResources

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During sequential bleaching operations, pulp fiber properties are gradually changed due to mechanical and chemical treatments. In this study, the correlations between pulp or fiber properties such as kappa number, viscosity, total charge, fiber length, and zero-span tensile strength as well as Scott bond of elemental chlorine free (ECF) bleached softwood kraft pulps was investigated. The influence of zero-span tensile strength and Scott bond on tensile and tear strength was also discussed. The Scott bond and zero-span tensile strength showed a strong logarithmic correlation with pulp kappa number and pulp viscosity, while the regression coefficient for Scott bond was negative. An overall deterioration of paper tensile and tear strength from pulps whether beaten or not were observed along the multi-stage ECF bleaching operations. Changing contributions to sheet tensile or tear strength could be mostly attributed to changes in zero-span tensile strength rather than Scott bond during ECF bleaching.

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“…When considering such data, however, it should be kept in mind that the correlation between cellulose DP and paper strength can be different for different test procedures. Such results must be considered cautiously, since paper's strength also can be highly affected by localized damage that within the fibers during pulping operations (Gurnagul et al 1992).…”

Section: Acidic Paper and The More Rapid Degradation Of Books Observamentioning

confidence: 99%

Deacidification of Acidic Books and Paper by Means of Non-aqueous Dispersions of Alkaline Particles: A Review Focusing on Completeness of the Reaction

Hubbe¹,

Smith²,

Zou³

et al. 2017

BioResources

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The effect of cellulose degradation on the strength of wood pulp fibres

Cited by 87 publications

References 0 publications

Visualization of structural changes in cellulosic substrates during enzymatic hydrolysis using multimodal nonlinear microscopy

Visualization of structural changes in cellulosic substrates during enzymatic hydrolysis using multimodal nonlinear microscopy

Correlation Analysis for Fiber Characteristics and Strength Properties of Softwood Kraft Pulps from Different Stages of a Bleaching Fiber Line

Deacidification of Acidic Books and Paper by Means of Non-aqueous Dispersions of Alkaline Particles: A Review Focusing on Completeness of the Reaction

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