The effect of wetting cycles on moisture behaviour of thermally modified Scots pine (Pinus sylvestris L.) wood

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43110%2F16%3A43906610" target="_blank" >RIV/62156489:43110/16:43906610 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s10853-015-9471-5" target="_blank" >http://dx.doi.org/10.1007/s10853-015-9471-5</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10853-015-9471-5" target="_blank" >10.1007/s10853-015-9471-5</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The effect of wetting cycles on moisture behaviour of thermally modified Scots pine (Pinus sylvestris L.) wood

Popis výsledku v původním jazyce

The moisture behaviour of thermally modified Scots pine (Pinus sylvestris L.) exposed to cyclic conditions was analysed. Specimens of dimensions 1591595mm3were thermally modified at 180oC (TM1) and 220oC (TM2) using atmospheric pressure and superheated steam. Radial, tangential, volumetric swelling and anti-swelling efficiency (ASE) were calculated during six consecutive drying-soaking cycles. Afterwards, additional specimens were exposed to ten relative humidity cycles (0 and 95 %) at temperature 25 and 40oC in order to analyse its influence on sorption behaviour. Application of thermal modification led to significant reduction of swelling from original18.4-13.3 % for TM1and to 10.5 % for TM2. However, after exposure to six consecutive soaking-drying cycles, the swelling of control specimens slightly decreased, whereas the swelling of thermally modified specimens increased. Dueto the increased swelling after repeated cycles, the original ASE (28.6 and 42.7 %) decreased to 22.5 % for TM1and to36.88 % for TM2. The presence of leachable compounds and release of internal stresses are mainly attributed to that phenomenon. The EMC of the reference specimens decreases over the repeated humidity cycles for approximately1 %-units. Same trend was found for the mild thermal modification TM1, but decreasing only in the range of0.5 %-units. However, the EMC of the TM2specimensduring humidity cycles behaved differently. The results provide a better insight into details of thermal modification of wood and its behaviour under cyclic conditions.

Název v anglickém jazyce

The effect of wetting cycles on moisture behaviour of thermally modified Scots pine (Pinus sylvestris L.) wood

Popis výsledku anglicky

The moisture behaviour of thermally modified Scots pine (Pinus sylvestris L.) exposed to cyclic conditions was analysed. Specimens of dimensions 1591595mm3were thermally modified at 180oC (TM1) and 220oC (TM2) using atmospheric pressure and superheated steam. Radial, tangential, volumetric swelling and anti-swelling efficiency (ASE) were calculated during six consecutive drying-soaking cycles. Afterwards, additional specimens were exposed to ten relative humidity cycles (0 and 95 %) at temperature 25 and 40oC in order to analyse its influence on sorption behaviour. Application of thermal modification led to significant reduction of swelling from original18.4-13.3 % for TM1and to 10.5 % for TM2. However, after exposure to six consecutive soaking-drying cycles, the swelling of control specimens slightly decreased, whereas the swelling of thermally modified specimens increased. Dueto the increased swelling after repeated cycles, the original ASE (28.6 and 42.7 %) decreased to 22.5 % for TM1and to36.88 % for TM2. The presence of leachable compounds and release of internal stresses are mainly attributed to that phenomenon. The EMC of the reference specimens decreases over the repeated humidity cycles for approximately1 %-units. Same trend was found for the mild thermal modification TM1, but decreasing only in the range of0.5 %-units. However, the EMC of the TM2specimensduring humidity cycles behaved differently. The results provide a better insight into details of thermal modification of wood and its behaviour under cyclic conditions.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JJ - Ostatní materiály

OECD FORD obor

—

Projekt

<a href="/cs/project/EE2.3.30.0031" target="_blank" >EE2.3.30.0031: Postdoktorské pozice v technických a ekonomických oborech na MENDELU</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Journal of Materials Science

ISSN

0022-2461

e-ISSN

—

Svazek periodika

51

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

1504-1511

Kód UT WoS článku

000367612500035

EID výsledku v databázi Scopus

2-s2.0-84952985879