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The Viscoelastic Behaviour of Waterlogged Archaeological Wood Treated with Methyltrimethoxysilane

Waterlogged wood treatment with methyltrimethoxysilane (MTMS) proved effective in stabilising wood dimensions upon drying (anti-shrink efficiency of 76–93%). Before the method can be proposed as a reliable conservation treatment, further research is required that includes the evaluation of the mecha...

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Autores principales: Broda, Magdalena, Spear, Morwenna J., Curling, Simon F., Ormondroyd, Graham A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8467558/
https://www.ncbi.nlm.nih.gov/pubmed/34576374
http://dx.doi.org/10.3390/ma14185150
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author Broda, Magdalena
Spear, Morwenna J.
Curling, Simon F.
Ormondroyd, Graham A.
author_facet Broda, Magdalena
Spear, Morwenna J.
Curling, Simon F.
Ormondroyd, Graham A.
author_sort Broda, Magdalena
collection PubMed
description Waterlogged wood treatment with methyltrimethoxysilane (MTMS) proved effective in stabilising wood dimensions upon drying (anti-shrink efficiency of 76–93%). Before the method can be proposed as a reliable conservation treatment, further research is required that includes the evaluation of the mechanical properties of treated wood. The aim of the study was to characterise the effect of the treatment on the viscoelastic behaviour of archaeological waterlogged elm and oak wood differing in the degree of degradation. Dynamic mechanical analysis in the temperature range from −150 to +150 °C was used for the study. To better understand the viscoelastic behaviour of the treated wood, pore structure and moisture properties were also investigated using Scanning Electron Microscopy, nitrogen sorption, and Dynamic Vapour Sorption. The results clearly show that methyltrimethoxysilane not only prevents collapse and distortions of the degraded cell walls and decreases wood hygroscopicity (by more than half for highly degraded wood), but also reinforces the mechanical strength by increasing stiffness and resistance to deformation for heavily degraded wood (with an increase in storage modulus). However, the MTMS also has a plasticising effect on treated wood, as observed in the increased value of loss modulus and introduction of a new tan δ peak). On the one hand, methyltrimethoxysilane reduces wood hygroscopicity that reflects in lower wood moisture content, thus limiting the plasticising effect of water on wood polymers, but on the other hand, as a polymer itself, it contributes to the viscous behaviour of the treated wood. Interestingly, the effect of silane differs with both the wood species and the degree of wood degradation.
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spelling pubmed-84675582021-09-27 The Viscoelastic Behaviour of Waterlogged Archaeological Wood Treated with Methyltrimethoxysilane Broda, Magdalena Spear, Morwenna J. Curling, Simon F. Ormondroyd, Graham A. Materials (Basel) Article Waterlogged wood treatment with methyltrimethoxysilane (MTMS) proved effective in stabilising wood dimensions upon drying (anti-shrink efficiency of 76–93%). Before the method can be proposed as a reliable conservation treatment, further research is required that includes the evaluation of the mechanical properties of treated wood. The aim of the study was to characterise the effect of the treatment on the viscoelastic behaviour of archaeological waterlogged elm and oak wood differing in the degree of degradation. Dynamic mechanical analysis in the temperature range from −150 to +150 °C was used for the study. To better understand the viscoelastic behaviour of the treated wood, pore structure and moisture properties were also investigated using Scanning Electron Microscopy, nitrogen sorption, and Dynamic Vapour Sorption. The results clearly show that methyltrimethoxysilane not only prevents collapse and distortions of the degraded cell walls and decreases wood hygroscopicity (by more than half for highly degraded wood), but also reinforces the mechanical strength by increasing stiffness and resistance to deformation for heavily degraded wood (with an increase in storage modulus). However, the MTMS also has a plasticising effect on treated wood, as observed in the increased value of loss modulus and introduction of a new tan δ peak). On the one hand, methyltrimethoxysilane reduces wood hygroscopicity that reflects in lower wood moisture content, thus limiting the plasticising effect of water on wood polymers, but on the other hand, as a polymer itself, it contributes to the viscous behaviour of the treated wood. Interestingly, the effect of silane differs with both the wood species and the degree of wood degradation. MDPI 2021-09-08 /pmc/articles/PMC8467558/ /pubmed/34576374 http://dx.doi.org/10.3390/ma14185150 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Broda, Magdalena
Spear, Morwenna J.
Curling, Simon F.
Ormondroyd, Graham A.
The Viscoelastic Behaviour of Waterlogged Archaeological Wood Treated with Methyltrimethoxysilane
title The Viscoelastic Behaviour of Waterlogged Archaeological Wood Treated with Methyltrimethoxysilane
title_full The Viscoelastic Behaviour of Waterlogged Archaeological Wood Treated with Methyltrimethoxysilane
title_fullStr The Viscoelastic Behaviour of Waterlogged Archaeological Wood Treated with Methyltrimethoxysilane
title_full_unstemmed The Viscoelastic Behaviour of Waterlogged Archaeological Wood Treated with Methyltrimethoxysilane
title_short The Viscoelastic Behaviour of Waterlogged Archaeological Wood Treated with Methyltrimethoxysilane
title_sort viscoelastic behaviour of waterlogged archaeological wood treated with methyltrimethoxysilane
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8467558/
https://www.ncbi.nlm.nih.gov/pubmed/34576374
http://dx.doi.org/10.3390/ma14185150
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