Application of Microwave Heating for Acetylation of Beech (Fagus sylvatica L.) and Poplar (Populus hybrids) Wood

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F16%3A43917469" target="_blank" >RIV/62156489:43410/16:43917469 - isvavai.cz</a>

Výsledek na webu

<a href="http://publicatio.nyme.hu/1056/1/Hardwood_2016_Proceedings_final_cover.pdf" target="_blank" >http://publicatio.nyme.hu/1056/1/Hardwood_2016_Proceedings_final_cover.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Application of Microwave Heating for Acetylation of Beech (Fagus sylvatica L.) and Poplar (Populus hybrids) Wood

Popis výsledku v původním jazyce

Wood is a natural heterogeneous composite and is considered to be dimensionally unstable when exposed to wet conditions. Hydroxyl (-OH) groups of hemicellulose and cellulose chains are mainly responsible for the highly hygroscopic behaviour of wood (STAMM 1964). Chemical modification can, for instance, be used as an efficient way to transform hydrophilic OH groups into larger hydrophobic groups (KOLLMANN 1951). Acetylation of wood is one of the most commonly used chemical treatments to improve the dimensional stability and biological durability of wood. Acetylation effectively changes free hydroxyls within the wood into acetyl groups (ROWELL ET AL. 2013). The standard acetylation process includes impregnation of ovendried wood with acetic anhydride (Ac2O), followed by conventional heating to initiate the chemical reactions with wood polymers. Time consumption is an important issue for the proposed acetylation method. In order to reduce the reaction time and make the process more effective, an innovative wood acetylation process that uses microwave (MW) energy has been recently studied (LARSSON AND SIMONSON 1999; LI ET AL. 2009). Unfortunately, published studies related to the acetylation process conducted using MW heating are still limited. Therefore, the present study aims to (1) analyze the acetylation process using MW heating, (2) evaluate the efficacy of MW heating on the chemical reactions during the process and its similarities with conventional methods, and (3) evaluate material properties (uptake of substances, equilibrium moisture content, wood swelling, and anti-swelling efficiency).

Název v anglickém jazyce

Application of Microwave Heating for Acetylation of Beech (Fagus sylvatica L.) and Poplar (Populus hybrids) Wood

Popis výsledku anglicky

Wood is a natural heterogeneous composite and is considered to be dimensionally unstable when exposed to wet conditions. Hydroxyl (-OH) groups of hemicellulose and cellulose chains are mainly responsible for the highly hygroscopic behaviour of wood (STAMM 1964). Chemical modification can, for instance, be used as an efficient way to transform hydrophilic OH groups into larger hydrophobic groups (KOLLMANN 1951). Acetylation of wood is one of the most commonly used chemical treatments to improve the dimensional stability and biological durability of wood. Acetylation effectively changes free hydroxyls within the wood into acetyl groups (ROWELL ET AL. 2013). The standard acetylation process includes impregnation of ovendried wood with acetic anhydride (Ac2O), followed by conventional heating to initiate the chemical reactions with wood polymers. Time consumption is an important issue for the proposed acetylation method. In order to reduce the reaction time and make the process more effective, an innovative wood acetylation process that uses microwave (MW) energy has been recently studied (LARSSON AND SIMONSON 1999; LI ET AL. 2009). Unfortunately, published studies related to the acetylation process conducted using MW heating are still limited. Therefore, the present study aims to (1) analyze the acetylation process using MW heating, (2) evaluate the efficacy of MW heating on the chemical reactions during the process and its similarities with conventional methods, and (3) evaluate material properties (uptake of substances, equilibrium moisture content, wood swelling, and anti-swelling efficiency).

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20502 - Paper and wood

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the Eco-efficient resource wood with special focus on hardwoods

ISBN

978-963-334-291-6

ISSN

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e-ISSN

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Počet stran výsledku

2

Strana od-do

54-55

Název nakladatele

University of West Hungary

Místo vydání

Sopron

Místo konání akce

Sopron

Datum konání akce

8. 9. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000473720100021