Effects of refining on the fibre structure of kraft pulps as revealed by FE-SEM and TEM: Influence of alkaline degradation
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U. Molin
Abstract
The aim of the study was to evaluate the effect of refining on the ultrastructure of spruce pulp fibres. Pulps with different molar masses of cellulose (estimated as intrinsic viscosity) were studied after PFI-refining. The molar masses of the polymers were decreased by increases in alkali concentration during pulping. Fibre surface structures were examined using Field Emission Scanning Electron Microscopy (FE-SEM) and Transmission Electron Microscopy (TEM) was used to observe changes in the internal structure of the fibres. Pulps with lower (125 and 329 ml g−1) intrinsic viscosity showed more damaged during refining than pulps with higher (620 and 1120 ml g−1) intrinsic viscosity. Observations showed pulps with lower intrinsic viscosity to have large decreases in fibre length after refining. Fibres with low intrinsic viscosity (i.e., 125 ml g−1) had less primary wall and S1 layer remaining and the external fibrillation and damage of the S2 layer had increased. The S2 wall of fibres with high intrinsic viscosity showed characteristic delamination. Similar delamination was not visible for fibres with low intrinsic viscosity.
Copyright © 2004 by Walter de Gruyter GmbH & Co. KG
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- Changes in the fiber wall during refining of bleached pine kraft pulp
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- Changes in the surface properties of wood due to sanding
- Use of near infrared spectroscopy to predict the mechanical properties of six softwoods
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- Moisture adsorption thermodynamics of wood from fractal-geometry approach
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- Production of 2,5-dimethoxyhydroquinone by the brown-rot fungus Serpula lacrymans to drive extracellular Fenton reaction
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- The use of organo alkoxysilane coupling agents for wood preservation
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Articles in the same Issue
- The Bremen Cog of 1380 – An electron microscopic study of its degraded wood before and after stabilization with PEG
- Ultrastructure of iodine treated wood
- Effects of refining on the fibre structure of kraft pulps as revealed by FE-SEM and TEM: Influence of alkaline degradation
- Changes in the fiber wall during refining of bleached pine kraft pulp
- An unusual formation of tension wood in a natural forest Acacia sp.
- Changes in the surface properties of wood due to sanding
- Use of near infrared spectroscopy to predict the mechanical properties of six softwoods
- The creep of wood destabilized by change in moisture content. Part 1: The creep behaviors of wood during and immediately after drying
- Modeling the process of desorption of water in oak (Quercus robur L.) wood
- Moisture adsorption thermodynamics of wood from fractal-geometry approach
- Application of ionic liquids for electrostatic control in wood
- Ionic liquids in wood preservation
- New bis-quaternary ammonium and bis-imidazolium chloride wood preservatives
- Environmentally-benign wood preservatives based on an organic biocide:antioxidant combination: Ground-contact efficacy ratings and BHT depletion after four years of exposure
- Production of 2,5-dimethoxyhydroquinone by the brown-rot fungus Serpula lacrymans to drive extracellular Fenton reaction
- Fungal decay resistance of wood reacted with phosphorus pentoxide-amine system
- The use of organo alkoxysilane coupling agents for wood preservation
- Phenolic extractives from wood of birch (Betula pendula)
- Stability of arylglycerols during alkaline cooking
