Beziehungen zwischen der Elastizität und der statischen sowie dynamischen Biegefestigkeit von Kiefernholz nach dem Angriff durch echte holzzerstörende Pilze

Schultze-Dewitz, G.

doi:10.1007/bf02612884

Cited by 7 publications

(2 citation statements)

References 13 publications

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“…Brown rot fungi preferentially attack and rapidly depolymerize the structural carbohydrates in the cell wall, cellulose and hemicelluloses, leaving behind highly modified lignin residues [7][8][9]. The efficient degradation of polysaccharides causes brittleness in the wood and loss of mechanical strength [7] even before mass loss can be detected [10][11][12][13]. Thus, brown rot fungi are particularly relevant in the built environment where they can rapidly compromise the strength of structural wood products.…”

Section: Introductionmentioning

confidence: 99%

The Importance of Moisture for Brown Rot Degradation of Modified Wood: A Critical Discussion

Ringman

Beck

Pilgård

2019

Forests

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The effect of wood modification on wood-water interactions in modified wood is poorly understood, even though water is a critical factor in fungal wood degradation. A previous review suggested that decay resistance in modified wood is caused by a reduced wood moisture content (MC) that inhibits the diffusion of oxidative fungal metabolites. It has been reported that a MC below 23%–25% will protect wood from decay, which correlates with the weight percent gain (WPG) level seen to inhibit decay in modified wood for several different kinds of wood modifications. In this review, the focus is on the role of water in brown rot decay of chemically and thermally modified wood. The study synthesizes recent advances in the inhibition of decay and the effects of wood modification on the MC and moisture relationships in modified wood. We discuss three potential mechanisms for diffusion inhibition in modified wood: (i) nanopore blocking; (ii) capillary condensation in nanopores; and (iii) plasticization of hemicelluloses. The nanopore blocking theory works well with cell wall bulking and crosslinking modifications, but it seems less applicable to thermal modification, which may increase nanoporosity. Preventing the formation of capillary water in nanopores also explains cell wall bulking modification well. However, the possibility of increased nanoporosity in thermally modified wood and increased wood-water surface tension for 1.3-dimethylol-4.5-dihydroxyethyleneurea (DMDHEU) modification complicate the interpretation of this theory for these modifications. Inhibition of hemicellulose plasticization fits well with diffusion prevention in acetylated, DMDHEU and thermally modified wood, but plasticity in furfurylated wood may be increased. We also point out that the different mechanisms are not mutually exclusive, and it may be the case that they all play some role to varying degrees for each modification. Furthermore, we highlight recent work which shows that brown rot fungi will eventually degrade modified wood materials, even at high treatment levels. The herein reviewed literature suggests that the modification itself may initially be degraded, followed by an increase in wood cell wall MC to a level where chemical transport is possible.

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Section: Introductionmentioning

confidence: 99%

The Importance of Moisture for Brown Rot Degradation of Modified Wood: A Critical Discussion

Ringman

Beck

Pilgård

2019

Forests

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“…Wood applications in building and construction are faced with and influenced by varying environmental conditions and a permanent presence of microbial organisms. Brown rot basidiomycetes are reckoned to cause the most destructive type of wood decay, even before any mass loss is detectable (Schultze-Dewitz 1966; Bariska, Osusk and Bosshard 1983; Winandy and Morrell 1993). Brown rot fungi attack the structural basis of the wood cell wall, cellulose and hemicelluloses, leaving a modified lignin behind (Danninger, Messner and Rohr 1980; Eriksson, Blanchette and Ander 1990; Goodell 2003).…”

Section: Introductionmentioning

confidence: 99%

Improvement of a method for topochemical investigations of degraded furfurylated wood

Ehmcke

Pilgård

Koch

et al. 2016

International Wood Products Journal

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Today there is an increasing demand for wood protection systems which are based on low environmental impact technologies. The aim of this study was to improve a method for investigating furfurylated Pinus radiata, both in terms of the furfuryl alcohol polymerisation process in the wood cell wall and the detection of initial signs of brown rot degradation. It is an established theory today that brown rot degradation starts with lignin modification in the outermost part of the secondary cell wall and the combined middle lamella. We adapted a method (cellular UV microspectrophotometry, UMSP) which enables direct imaging of the lignin distribution and modification within individual cell wall layers. Furfurylated P. radiata, incubated with Postia placenta, were scanned with monochromatic UV-light at 280 nm. The results showed that USMP is a promising method to study furfurylated wood and early fungal degradation damages in the cell wall of furfurylated wood.

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Influence of fungal decay by different basidiomycetes on the structural integrity of Norway spruce wood

Brischke

Welzbacher

Huckfeldt³

2008

Holz Roh Werkst

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Beziehungen zwischen der Elastizität und der statischen sowie dynamischen Biegefestigkeit von Kiefernholz nach dem Angriff durch echte holzzerstörende Pilze

Cited by 7 publications

References 13 publications

The Importance of Moisture for Brown Rot Degradation of Modified Wood: A Critical Discussion

The Importance of Moisture for Brown Rot Degradation of Modified Wood: A Critical Discussion

Improvement of a method for topochemical investigations of degraded furfurylated wood

Influence of fungal decay by different basidiomycetes on the structural integrity of Norway spruce wood

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