Importance of beech wood pre-treatment for impregnation with mimosa tannin extract

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Importance of beech wood pre-treatment for impregnation with mimosa tannin extract

Popis výsledku v původním jazyce

In this paper, the effect of beech wood pre-treatment on the industrial tannin extract fixation efficiency after vacuum impregnation, was investigated. The temperature of wood drying was set at 60oC for 24hours till reaching the moisture equilibrium (i.e. for those conditions) in order to eliminate thermal degradation of wood and of implemented tannin; and moreover to keep bridges via water molecules present deeply in wooden matrix for connection with newly created bonding sites. Samples were immersed under water for 12hours. Water, as a polar solvent, decreased the content of in wood present small molecules, e.g. broken-down parts of hemicelluloses, non-bonded water-soluble extractives at 60oC to even higher extend than at ambient temperature (0.49mg vs. 0.23mg glucose equivalent per 1g of dried wood). This free space was shown to be advantageous for direct reaction of tannin with wooden polymers, since tannins can bond with carbohydrates; and slightly improved leaching resistance was also observed. However, in case of waterborne protection development without hardeners addition, better fixation conditions have to be established.

Název v anglickém jazyce

Importance of beech wood pre-treatment for impregnation with mimosa tannin extract

Popis výsledku anglicky

In this paper, the effect of beech wood pre-treatment on the industrial tannin extract fixation efficiency after vacuum impregnation, was investigated. The temperature of wood drying was set at 60oC for 24hours till reaching the moisture equilibrium (i.e. for those conditions) in order to eliminate thermal degradation of wood and of implemented tannin; and moreover to keep bridges via water molecules present deeply in wooden matrix for connection with newly created bonding sites. Samples were immersed under water for 12hours. Water, as a polar solvent, decreased the content of in wood present small molecules, e.g. broken-down parts of hemicelluloses, non-bonded water-soluble extractives at 60oC to even higher extend than at ambient temperature (0.49mg vs. 0.23mg glucose equivalent per 1g of dried wood). This free space was shown to be advantageous for direct reaction of tannin with wooden polymers, since tannins can bond with carbohydrates; and slightly improved leaching resistance was also observed. However, in case of waterborne protection development without hardeners addition, better fixation conditions have to be established.

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

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

Wood Science and Engineering in the Third Millenium: Proceedings of the International Conference (ICWSE 2019)

ISBN

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ISSN

1843-2689

e-ISSN

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Počet stran výsledku

4

Strana od-do

391-394

Název nakladatele

Universitatea Transilvania din Brasov

Místo vydání

Brasov

Místo konání akce

Brašov

Datum konání akce

7. 11. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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