Water vapour sorption properties of thermally modified and pressurised hot-water-extracted wood powder

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Water vapour sorption properties of thermally modified and pressurised hot-water-extracted wood powder. / Lillqvist, Kristiina; Källbom, Susanna; Altgen, Michael; Belt, Tiina; Rautkari, Lauri.

In: Holzforschung, 07.2019.

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@article{421fb84e3dd44bfa9b3e936116585a45,
title = "Water vapour sorption properties of thermally modified and pressurised hot-water-extracted wood powder",
abstract = "The objective of the study was to investigate the water vapour sorption behaviour of thermally modified (TM) wood powder, e.g. ground wood prepared from waste streams of TM solid wood, and wood powder that was extracted in pressurised hot water. Solid spruce wood was TM in steam conditions (210°C for 3 h), milled and hot-water-extracted (HWE) at elevated pressure (140°C for 1 h). The results evidence that the hot-water extraction reduced the water sorption and the accessible hydroxyl group concentration by the removal of amorphous carbohydrates. In contrast, the enhanced cross-linking of the cell wall matrix and the annealing of amorphous matrix polymers during thermal modification reduced the sorption behaviour of wood additionally, without further reducing the hydroxyl accessibility. These additional effects of thermal modification were at least partially cancelled by hot-water extraction. The results bring novel insights into the mechanisms that reduce the water vapour sorption of wood by compositional and structural changes induced by heating.",
keywords = "carbohydrate analysis, deuterium exchange, dynamic vapour sorption, hot-water extraction, thermal modification",
author = "Kristiina Lillqvist and Susanna K{\"a}llbom and Michael Altgen and Tiina Belt and Lauri Rautkari",
year = "2019",
month = "7",
doi = "10.1515/hf-2018-0301",
language = "English",
journal = "Holzforschung",
issn = "0018-3830",

}

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TY - JOUR

T1 - Water vapour sorption properties of thermally modified and pressurised hot-water-extracted wood powder

AU - Lillqvist, Kristiina

AU - Källbom, Susanna

AU - Altgen, Michael

AU - Belt, Tiina

AU - Rautkari, Lauri

PY - 2019/7

Y1 - 2019/7

N2 - The objective of the study was to investigate the water vapour sorption behaviour of thermally modified (TM) wood powder, e.g. ground wood prepared from waste streams of TM solid wood, and wood powder that was extracted in pressurised hot water. Solid spruce wood was TM in steam conditions (210°C for 3 h), milled and hot-water-extracted (HWE) at elevated pressure (140°C for 1 h). The results evidence that the hot-water extraction reduced the water sorption and the accessible hydroxyl group concentration by the removal of amorphous carbohydrates. In contrast, the enhanced cross-linking of the cell wall matrix and the annealing of amorphous matrix polymers during thermal modification reduced the sorption behaviour of wood additionally, without further reducing the hydroxyl accessibility. These additional effects of thermal modification were at least partially cancelled by hot-water extraction. The results bring novel insights into the mechanisms that reduce the water vapour sorption of wood by compositional and structural changes induced by heating.

AB - The objective of the study was to investigate the water vapour sorption behaviour of thermally modified (TM) wood powder, e.g. ground wood prepared from waste streams of TM solid wood, and wood powder that was extracted in pressurised hot water. Solid spruce wood was TM in steam conditions (210°C for 3 h), milled and hot-water-extracted (HWE) at elevated pressure (140°C for 1 h). The results evidence that the hot-water extraction reduced the water sorption and the accessible hydroxyl group concentration by the removal of amorphous carbohydrates. In contrast, the enhanced cross-linking of the cell wall matrix and the annealing of amorphous matrix polymers during thermal modification reduced the sorption behaviour of wood additionally, without further reducing the hydroxyl accessibility. These additional effects of thermal modification were at least partially cancelled by hot-water extraction. The results bring novel insights into the mechanisms that reduce the water vapour sorption of wood by compositional and structural changes induced by heating.

KW - carbohydrate analysis

KW - deuterium exchange

KW - dynamic vapour sorption

KW - hot-water extraction

KW - thermal modification

UR - http://www.scopus.com/inward/record.url?scp=85069753584&partnerID=8YFLogxK

U2 - 10.1515/hf-2018-0301

DO - 10.1515/hf-2018-0301

M3 - Article

JO - Holzforschung

JF - Holzforschung

SN - 0018-3830

ER -

ID: 35526939