Effects of Changes in Biopolymer Composition on Moisture in Acetylated Wood
To investigate the effects of changes in biopolymer composition on moisture in acetylated poplar wood (<i>Populus euramericana</i> Cv.), the acetylation of control wood was compared to the acetylation of wood with reduced hemicellulose or lignin content (about 9% reduction of total speci...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-06-01
|
| Series: | Forests |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1999-4907/11/7/719 |
| _version_ | 1797563851893374976 |
|---|---|
| author | Tiantian Yang Emil Engelund Thybring Maria Fredriksson Erni Ma Jinzhen Cao Ramūnas Digaitis Lisbeth Garbrecht Thygesen |
| author_facet | Tiantian Yang Emil Engelund Thybring Maria Fredriksson Erni Ma Jinzhen Cao Ramūnas Digaitis Lisbeth Garbrecht Thygesen |
| author_sort | Tiantian Yang |
| collection | DOAJ |
| description | To investigate the effects of changes in biopolymer composition on moisture in acetylated poplar wood (<i>Populus euramericana</i> 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 (<i>T</i><sub>2</sub>) 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. |
| first_indexed | 2024-03-10T18:49:03Z |
| format | Article |
| id | doaj.art-0e4f201b6a124b85add76872db993e17 |
| institution | Directory Open Access Journal |
| issn | 1999-4907 |
| language | English |
| last_indexed | 2024-03-10T18:49:03Z |
| publishDate | 2020-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Forests |
| spelling | doaj.art-0e4f201b6a124b85add76872db993e172023-11-20T05:16:36ZengMDPI AGForests1999-49072020-06-0111771910.3390/f11070719Effects of Changes in Biopolymer Composition on Moisture in Acetylated WoodTiantian Yang0Emil Engelund Thybring1Maria Fredriksson2Erni Ma3Jinzhen Cao4Ramūnas Digaitis5Lisbeth Garbrecht Thygesen6College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, ChinaDepartment of Geosciences and Natural Resource Management, University of Copenhagen, DK-1958 Frederiksberg C, DenmarkDivision of Building Materials, Lund University, SE-221 00 Lund, SwedenDepartment of Wood Science and Technology, Beijing Forestry University, Beijing 100083, ChinaDepartment of Wood Science and Technology, Beijing Forestry University, Beijing 100083, ChinaDivision of Building Materials, Lund University, SE-221 00 Lund, SwedenDepartment of Geosciences and Natural Resource Management, University of Copenhagen, DK-1958 Frederiksberg C, DenmarkTo investigate the effects of changes in biopolymer composition on moisture in acetylated poplar wood (<i>Populus euramericana</i> 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 (<i>T</i><sub>2</sub>) 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.https://www.mdpi.com/1999-4907/11/7/719acetylationbiopolymer composition changehemicelluloseligninmoisturewood |
| spellingShingle | Tiantian Yang Emil Engelund Thybring Maria Fredriksson Erni Ma Jinzhen Cao Ramūnas Digaitis Lisbeth Garbrecht Thygesen Effects of Changes in Biopolymer Composition on Moisture in Acetylated Wood Forests acetylation biopolymer composition change hemicellulose lignin moisture wood |
| title | Effects of Changes in Biopolymer Composition on Moisture in Acetylated Wood |
| title_full | Effects of Changes in Biopolymer Composition on Moisture in Acetylated Wood |
| title_fullStr | Effects of Changes in Biopolymer Composition on Moisture in Acetylated Wood |
| title_full_unstemmed | Effects of Changes in Biopolymer Composition on Moisture in Acetylated Wood |
| title_short | Effects of Changes in Biopolymer Composition on Moisture in Acetylated Wood |
| title_sort | effects of changes in biopolymer composition on moisture in acetylated wood |
| topic | acetylation biopolymer composition change hemicellulose lignin moisture wood |
| url | https://www.mdpi.com/1999-4907/11/7/719 |
| work_keys_str_mv | AT tiantianyang effectsofchangesinbiopolymercompositiononmoistureinacetylatedwood AT emilengelundthybring effectsofchangesinbiopolymercompositiononmoistureinacetylatedwood AT mariafredriksson effectsofchangesinbiopolymercompositiononmoistureinacetylatedwood AT ernima effectsofchangesinbiopolymercompositiononmoistureinacetylatedwood AT jinzhencao effectsofchangesinbiopolymercompositiononmoistureinacetylatedwood AT ramunasdigaitis effectsofchangesinbiopolymercompositiononmoistureinacetylatedwood AT lisbethgarbrechtthygesen effectsofchangesinbiopolymercompositiononmoistureinacetylatedwood |