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Effects of Changes in Biopolymer Composition on Moisture in Acetylated Wood

Yang, Tiantian ; Thybring, Emil E ; Fredriksson, Maria LU orcid ; Ma, Erni ; Cao, Jinzhen ; Digaitis, Ramunas LU and Thygesen, Lisbeth G (2020) In Forests 11(7).
Abstract
To investigate the effects of changes in biopolymer composition on moisture in acetylated poplar wood (Populus euramericana Cv.), the acetylation of control wood was compared to the acetylation of wood with reduced hemicellulose or lignin content (about 9% reduction of total specimen dry weight in both cases). Time-domain nuclear magnetic resonance relaxometry of water-saturated wood gave spin–spin relaxation times (T2) of water populations, while deuteration in a sorption balance was used to characterize the hydroxyl accessibility of the wood cell walls. As expected, the acetylation of pyridine-swelled wood reduced hydroxyl accessibility and made the cell wall less accessible to water, resulting in a reduction of cell wall moisture... (More)
To investigate the effects of changes in biopolymer composition on moisture in acetylated poplar wood (Populus euramericana Cv.), the acetylation of control wood was compared to the acetylation of wood with reduced hemicellulose or lignin content (about 9% reduction of total specimen dry weight in both cases). Time-domain nuclear magnetic resonance relaxometry of water-saturated wood gave spin–spin relaxation times (T2) of water populations, while deuteration in a sorption balance was used to characterize the hydroxyl accessibility of the wood cell walls. As expected, the acetylation of pyridine-swelled wood reduced hydroxyl accessibility and made the cell wall less accessible to water, resulting in a reduction of cell wall moisture content by about 24% compared with control wood. Hemicellulose loss per se increased the spin–spin relaxation time of cell wall water, while delignification had the opposite effect. The combined effect of hemicellulose removal and acetylation caused more than a 30% decrease of cell wall moisture content when compared with control wood. The acetylated and partially delignified wood cell walls contained higher cell wall moisture content than acetylated wood. An approximate theoretical calculation of hydroxyl accessibility for acetylated wood was in the low range, but it agreed rather well with the measured accessibility, while acetylated and partially hemicellulose-depleted and partially delignified wood for unknown reasons resulted in substantially lower hydroxyl accessibilities than the theoretical estimate (Less)
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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Forests
volume
11
issue
7
article number
719
publisher
MDPI AG
external identifiers
  • scopus:85089268127
ISSN
1999-4907
DOI
10.3390/f11070719
project
MODUWOOD - Modified Durable Wood Products
Fundamental understanding of the moisture uptake in modified wood for sustainable, durable wood structures
language
English
LU publication?
yes
id
d7801563-f516-4d0e-b822-43557e9c68c9
date added to LUP
2020-06-29 12:10:54
date last changed
2025-04-04 14:13:13
@article{d7801563-f516-4d0e-b822-43557e9c68c9,
  abstract     = {{To investigate the effects of changes in biopolymer composition on moisture in acetylated poplar wood (Populus euramericana Cv.), the acetylation of control wood was compared to the acetylation of wood with reduced hemicellulose or lignin content (about 9% reduction of total specimen dry weight in both cases). Time-domain nuclear magnetic resonance relaxometry of water-saturated wood gave spin–spin relaxation times (T2) of water populations, while deuteration in a sorption balance was used to characterize the hydroxyl accessibility of the wood cell walls. As expected, the acetylation of pyridine-swelled wood reduced hydroxyl accessibility and made the cell wall less accessible to water, resulting in a reduction of cell wall moisture content by about 24% compared with control wood. Hemicellulose loss per se increased the spin–spin relaxation time of cell wall water, while delignification had the opposite effect. The combined effect of hemicellulose removal and acetylation caused more than a 30% decrease of cell wall moisture content when compared with control wood. The acetylated and partially delignified wood cell walls contained higher cell wall moisture content than acetylated wood. An approximate theoretical calculation of hydroxyl accessibility for acetylated wood was in the low range, but it agreed rather well with the measured accessibility, while acetylated and partially hemicellulose-depleted and partially delignified wood for unknown reasons resulted in substantially lower hydroxyl accessibilities than the theoretical estimate}},
  author       = {{Yang, Tiantian and Thybring, Emil E and Fredriksson, Maria and Ma, Erni and Cao, Jinzhen and Digaitis, Ramunas and Thygesen, Lisbeth G}},
  issn         = {{1999-4907}},
  language     = {{eng}},
  number       = {{7}},
  publisher    = {{MDPI AG}},
  series       = {{Forests}},
  title        = {{Effects of Changes in Biopolymer Composition on Moisture in Acetylated Wood}},
  url          = {{http://dx.doi.org/10.3390/f11070719}},
  doi          = {{10.3390/f11070719}},
  volume       = {{11}},
  year         = {{2020}},
}