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Biological resistance of chemically modified aspen composites

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Title: Biological resistance of chemically modified aspen composites
Authors: Mihai, M. D., Timar, M. C., Pitman, A.
Source: International Biodeterioration & Biodegradation. 1999, Vol. 43 Issue 4, p181. 0p.
Subjects: European aspen, Technology, Wood decay
Abstract: Aspen wood (Populus tremula L.) was chemically modified by a two-step procedure consisting of esterification with maleic anhydride (MA) and subsequent oligoesterification with MA and glycidyl methacrylate (GMA) or allyl glycidyl ether (AGE). This chemical modification procedure was carried out on solid wood, veneers and sawdust. The modified wood showed thermoplastic properties and could be thermally formed byhot-pressing. As a result, solid wood and the veneer samples had smooth, glossy surfaces, while a plastic-like material was produced on thermally forming the modified sawdust. The biological resistance of chemically modified and thermally formed samples was assessed by determination of weight loss following exposure to a decay fungus in a laboratory test and by a weathering test. Modified samples exposed to the white rot Coriolus versicolor for 12 weeks in the laboratory were more resistant to decay, with weight losses significantly lower than for the corresponding control samples. Solvents and thermal treatmentsemployed in the chemical modification process had no significant effect on decay resistance of Aspen veneers. However, hot-pressing significantly improved decay resistance in unmodified wood samples by limiting hyphal colonization of the wood structure. A microscopic comparison of chemically modified and unmodified wood samples was conducted to examine extent of fungal colonization and decay. Chemical modification was also shown to enhance the weathering resistance of aspen wood to discoloration and surface erosion by UV and rainwater and to stain from mould fungi. [ABSTRACT FROM AUTHOR]
Copyright of International Biodeterioration & Biodegradation is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 8304706
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PubType: Academic Journal
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  Data: Biological resistance of chemically modified aspen composites
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  Data: <searchLink fieldCode="AR" term="%22Mihai%2C+M%2E+D%2E%22">Mihai, M. D.</searchLink><br /><searchLink fieldCode="AR" term="%22Timar%2C+M%2E+C%2E%22">Timar, M. C.</searchLink><br /><searchLink fieldCode="AR" term="%22Pitman%2C+A%2E%22">Pitman, A.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22International+Biodeterioration+%26+Biodegradation%22">International Biodeterioration & Biodegradation</searchLink>. 1999, Vol. 43 Issue 4, p181. 0p.
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  Data: <searchLink fieldCode="DE" term="%22European+aspen%22">European aspen</searchLink><br /><searchLink fieldCode="DE" term="%22Technology%22">Technology</searchLink><br /><searchLink fieldCode="DE" term="%22Wood+decay%22">Wood decay</searchLink>
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  Label: Abstract
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  Data: Aspen wood (Populus tremula L.) was chemically modified by a two-step procedure consisting of esterification with maleic anhydride (MA) and subsequent oligoesterification with MA and glycidyl methacrylate (GMA) or allyl glycidyl ether (AGE). This chemical modification procedure was carried out on solid wood, veneers and sawdust. The modified wood showed thermoplastic properties and could be thermally formed byhot-pressing. As a result, solid wood and the veneer samples had smooth, glossy surfaces, while a plastic-like material was produced on thermally forming the modified sawdust. The biological resistance of chemically modified and thermally formed samples was assessed by determination of weight loss following exposure to a decay fungus in a laboratory test and by a weathering test. Modified samples exposed to the white rot Coriolus versicolor for 12 weeks in the laboratory were more resistant to decay, with weight losses significantly lower than for the corresponding control samples. Solvents and thermal treatmentsemployed in the chemical modification process had no significant effect on decay resistance of Aspen veneers. However, hot-pressing significantly improved decay resistance in unmodified wood samples by limiting hyphal colonization of the wood structure. A microscopic comparison of chemically modified and unmodified wood samples was conducted to examine extent of fungal colonization and decay. Chemical modification was also shown to enhance the weathering resistance of aspen wood to discoloration and surface erosion by UV and rainwater and to stain from mould fungi. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of International Biodeterioration & Biodegradation is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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      – SubjectFull: Wood decay
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              Text: 1999
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