Characterisation of thermally modified wood: molecular reasons for wood performance improvement. Tjeerdsma, B. F., Boonstra, M., Pizzi, A., Tekely, P., & Militz, H. Holz als Roh- und Werkstoff, 56(3):149–153, May, 1998. ![Characterisation of thermally modified wood: molecular reasons for wood performance improvement [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Relatively mild thermal treatments of wood according to a two step process which leads to improved dimensional stability and improved timber performance were investigated by solid phase CP-MAS 13C-NMR to understand at molecular level the reasons for the improvements reported. All the occurrences described appear to be the consequence of reactions which are known in wood chemistry. These are the formation of acetic acid liberated from the hemicelluloses, which further catalyses carbohydrates cleavage, causing a reduction of degree of polymerisation of the carbohydrates. Acid catalysed degradation results in the formation of formaldehyde, furfural and other aldehydes as well as some lignin cleavage at Cα and O4 and believed to cause some aldehyde production from lignin units Cγ, all occurring in the first reaction step. Lignin autocondensation through the cleaved, positively charged benzylic Cα to form some methylene bridges presumably starts already to occur in this first phase. The increase in the number of free reactive sites on the aromatic ring of some lignin units already occurs in this phase but continues into the next.
@article{tjeerdsma_characterisation_1998,
title = {Characterisation of thermally modified wood: molecular reasons for wood performance improvement},
volume = {56},
issn = {1436-736X},
shorttitle = {Characterisation of thermally modified wood},
url = {https://doi.org/10.1007/s001070050287},
doi = {10.1007/s001070050287},
abstract = {Relatively mild thermal treatments of wood according to a two step process which leads to improved dimensional stability and improved timber performance were investigated by solid phase CP-MAS 13C-NMR to understand at molecular level the reasons for the improvements reported. All the occurrences described appear to be the consequence of reactions which are known in wood chemistry. These are the formation of acetic acid liberated from the hemicelluloses, which further catalyses carbohydrates cleavage, causing a reduction of degree of polymerisation of the carbohydrates. Acid catalysed degradation results in the formation of formaldehyde, furfural and other aldehydes as well as some lignin cleavage at Cα and O4 and believed to cause some aldehyde production from lignin units Cγ, all occurring in the first reaction step. Lignin autocondensation through the cleaved, positively charged benzylic Cα to form some methylene bridges presumably starts already to occur in this first phase. The increase in the number of free reactive sites on the aromatic ring of some lignin units already occurs in this phase but continues into the next.},
language = {en},
number = {3},
urldate = {2024-01-16},
journal = {Holz als Roh- und Werkstoff},
author = {Tjeerdsma, B. F. and Boonstra, M. and Pizzi, A. and Tekely, P. and Militz, H.},
month = may,
year = {1998},
keywords = {Lignin, Aromatic Nucleus, Equilibrium Moisture Content, Furfural, Methylene Bridge},
pages = {149--153},
file = {Full Text PDF:C\:\\Users\\Eva\\Zotero\\storage\\KBXHPLKN\\Tjeerdsma et al. - 1998 - Characterisation of thermally modified wood molec.pdf:application/pdf},
}
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