Changes in microstructure and stiffness of Scots pine (Pinus sylvestris L) sapwood degraded by Gloeophyllum trabeum and Trametes versicolor – Part II: Anisotropic stiffness properties
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Thomas K. Bader
,
Karin Hofstetter
Abstract
Fungal decay considerably affects the macroscopic mechanical properties of wood as a result of modifications and degradations in its microscopic structure. While effects on mechanical properties related to the stem direction are fairly well understood, effects on radial and tangential directions (transverse properties) are less well investigated. In the present study, changes of longitudinal elastic moduli and stiffness data in all anatomical directions of Scots pine (Pinus sylvestris) sapwood which was degraded by Gloeophyllum trabeum (brown rot) and Trametes versicolor (white rot) for up to 28 weeks have been investigated. Transverse properties were found to be much more deteriorated than the longitudinal ones. This is because of the degradation of the polymer matrix between the cellulose microfibrils, which has a strong effect on transverse stiffness. Longitudinal stiffness, on the other hand, is mainly governed by cellulose microfibrils, which are more stable agains fungal decay. G. trabeum (more active in earlywood) strongly weakens radial stiffness, whereas T. versicolor (more active in latewood) strongly reduces tangential stiffness. The data in terms of radial and tangential stiffnesses, as well as the corresponding anisotropy ratios, seem to be suitable as durability indicators of wood and even allow conclusions to be made on the degradation mechanisms of fungi.
©2012 by Walter de Gruyter Berlin Boston
Artikel in diesem Heft
- Original Papers
- Oxidative stabilisation of kraft lignin for carbon fibre production
- Antithrombotic properties of sulfated wood-derived galactoglucomannans
- Recycling potential of unbleached and bleached chemical pulps from juvenile and mature wood of Populus deltoides
- Natural and artificial ageing of spruce wood as observed by FTIR-ATR and UVRR spectroscopy
- Characterization of phenolic compounds from inner bark of Betula pendula
- Identification and functional characterization of a sesquiterpene synthase gene from Eleutherococcus trifoliatus
- Microstructure and stiffness of Scots pine (Pinus sylvestris L) sapwood degraded by Gloeophyllum trabeum and Trametes versicolor – Part I: Changes in chemical composition, density and equilibrium moisture content
- Changes in microstructure and stiffness of Scots pine (Pinus sylvestris L) sapwood degraded by Gloeophyllum trabeum and Trametes versicolor – Part II: Anisotropic stiffness properties
- Off-axis Young’s modulus and off-axis shear modulus of wood measured by flexural vibration tests
- Empirical models for radial and tangential fibre width in tree rings of Norway spruce in north-western Europe
- Automatic grain texture analysis using integral transforms
- The fungal resistance of wood modified with glutaraldehyde
- Relative fungal efficacy results from the soil block test with a long incubation period of three commercial copper wood preservatives
- Uneven distribution of preservative in kiln-dried sapwood lumber of Scots pine: Impact of wood structure and resin allocation
- Utilization of surfactants for consolidation of wooden work of art
- Screening for xylanase and β-xylosidase production from wood-inhabiting Penicillium strains for potential use in biotechnological applications
- Short Note
- Furfuryl alcohol impregnation for improved plasticization and fixation during the densification of wood
- Meetings
- Meetings
Artikel in diesem Heft
- Original Papers
- Oxidative stabilisation of kraft lignin for carbon fibre production
- Antithrombotic properties of sulfated wood-derived galactoglucomannans
- Recycling potential of unbleached and bleached chemical pulps from juvenile and mature wood of Populus deltoides
- Natural and artificial ageing of spruce wood as observed by FTIR-ATR and UVRR spectroscopy
- Characterization of phenolic compounds from inner bark of Betula pendula
- Identification and functional characterization of a sesquiterpene synthase gene from Eleutherococcus trifoliatus
- Microstructure and stiffness of Scots pine (Pinus sylvestris L) sapwood degraded by Gloeophyllum trabeum and Trametes versicolor – Part I: Changes in chemical composition, density and equilibrium moisture content
- Changes in microstructure and stiffness of Scots pine (Pinus sylvestris L) sapwood degraded by Gloeophyllum trabeum and Trametes versicolor – Part II: Anisotropic stiffness properties
- Off-axis Young’s modulus and off-axis shear modulus of wood measured by flexural vibration tests
- Empirical models for radial and tangential fibre width in tree rings of Norway spruce in north-western Europe
- Automatic grain texture analysis using integral transforms
- The fungal resistance of wood modified with glutaraldehyde
- Relative fungal efficacy results from the soil block test with a long incubation period of three commercial copper wood preservatives
- Uneven distribution of preservative in kiln-dried sapwood lumber of Scots pine: Impact of wood structure and resin allocation
- Utilization of surfactants for consolidation of wooden work of art
- Screening for xylanase and β-xylosidase production from wood-inhabiting Penicillium strains for potential use in biotechnological applications
- Short Note
- Furfuryl alcohol impregnation for improved plasticization and fixation during the densification of wood
- Meetings
- Meetings
