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Mass loss kinetics of thermally modified wood species as a time-temperature function

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F21%3A43919050" target="_blank" >RIV/62156489:43410/21:43919050 - isvavai.cz</a>

  • Výsledek na webu

    <a href="https://doi.org/10.1007/s00107-020-01634-6" target="_blank" >https://doi.org/10.1007/s00107-020-01634-6</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1007/s00107-020-01634-6" target="_blank" >10.1007/s00107-020-01634-6</a>

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Mass loss kinetics of thermally modified wood species as a time-temperature function

  • Popis výsledku v původním jazyce

    The mass loss kinetics of thermally modified wood species was analyzed as a time-temperature function. European beech (Fagus sylvatica L.), English oak (Quercus robur L.), Norwegian spruce (Picea abies L. Karst.) and Scots pine (Pinus sylvestris L.) wood specimens of dimensions 20 x 20 x 10 mm3 were thermally modified at 140 oC, 160 oC, 180 oC, 200 oC and 220 oC for 1-6 h using atmospheric pressure and superheated steam environment. The process intensity was determined by mass loss (ML), based on oven-dry mass before and after the thermal modification. Furthermore, the equilibrium moisture content (EMC) was determined before and after thermal modification to analyze the effect of mass loss on the sorption properties. Measured mass loss data were compared with the three-dimensional analytical function and its applicability to mass loss prediction was verified. For the studied wood species, the ML was found to be less than 1-1.5% when temperature of 140 oC and 160 oC was applied. Differences between studied species were more significant at temperatures higher than 160 oC. With the highest tested temperature (220 oC), mass loss reached 13.5% (beech), 18.8% (oak), 6.7% (spruce) and 13.5% (pine). According to the results, hardwoods have been shown to be more sensitive to the thermal degradation than softwoods as demonstrated by the higher mass loss recorded for the same modification time and temperature. The three-dimensional analytical function was confirmed as valid for all the species studied (R2 = 0.89-0.99) and relevant for the mass loss prediction using fitted parameters. The EMC was reduced after thermal modification within the range of 4-48%, 0.4-47%, 1-32% and 0.7-40% for beech, oak, spruce and pine, respectively. Further, the EMC correlates exponentially (R2 = 0.91-0.95) with the decrease in the specimens&apos; mass depending on the wood species used and modification temperature applied. However, the EMC seems to be almost stabilized beyond a limit value of approximately 10-12% of mass loss. The results provide a better insight into the mass loss and EMC kinetics of thermally modified wood species and can be used as a tool for prediction of mass loss values and required material properties (EMC) for designed wooden products.

  • Název v anglickém jazyce

    Mass loss kinetics of thermally modified wood species as a time-temperature function

  • Popis výsledku anglicky

    The mass loss kinetics of thermally modified wood species was analyzed as a time-temperature function. European beech (Fagus sylvatica L.), English oak (Quercus robur L.), Norwegian spruce (Picea abies L. Karst.) and Scots pine (Pinus sylvestris L.) wood specimens of dimensions 20 x 20 x 10 mm3 were thermally modified at 140 oC, 160 oC, 180 oC, 200 oC and 220 oC for 1-6 h using atmospheric pressure and superheated steam environment. The process intensity was determined by mass loss (ML), based on oven-dry mass before and after the thermal modification. Furthermore, the equilibrium moisture content (EMC) was determined before and after thermal modification to analyze the effect of mass loss on the sorption properties. Measured mass loss data were compared with the three-dimensional analytical function and its applicability to mass loss prediction was verified. For the studied wood species, the ML was found to be less than 1-1.5% when temperature of 140 oC and 160 oC was applied. Differences between studied species were more significant at temperatures higher than 160 oC. With the highest tested temperature (220 oC), mass loss reached 13.5% (beech), 18.8% (oak), 6.7% (spruce) and 13.5% (pine). According to the results, hardwoods have been shown to be more sensitive to the thermal degradation than softwoods as demonstrated by the higher mass loss recorded for the same modification time and temperature. The three-dimensional analytical function was confirmed as valid for all the species studied (R2 = 0.89-0.99) and relevant for the mass loss prediction using fitted parameters. The EMC was reduced after thermal modification within the range of 4-48%, 0.4-47%, 1-32% and 0.7-40% for beech, oak, spruce and pine, respectively. Further, the EMC correlates exponentially (R2 = 0.91-0.95) with the decrease in the specimens&apos; mass depending on the wood species used and modification temperature applied. However, the EMC seems to be almost stabilized beyond a limit value of approximately 10-12% of mass loss. The results provide a better insight into the mass loss and EMC kinetics of thermally modified wood species and can be used as a tool for prediction of mass loss values and required material properties (EMC) for designed wooden products.

Klasifikace

  • Druh

    J<sub>imp</sub> - Článek v periodiku v databázi Web of Science

  • CEP obor

  • OECD FORD obor

    20502 - Paper and wood

Návaznosti výsledku

  • Projekt

    <a href="/cs/project/GJ19-25171Y" target="_blank" >GJ19-25171Y: Hygro-termo-mechanické chování modifikovaných materiálů na bázi dřeva na různých úrovních pozorování</a><br>

  • Návaznosti

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

Ostatní

  • Rok uplatnění

    2021

  • Kód důvěrnosti údajů

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

Údaje specifické pro druh výsledku

  • Název periodika

    European Journal of Wood and Wood Products

  • ISSN

    0018-3768

  • e-ISSN

  • Svazek periodika

    79

  • Číslo periodika v rámci svazku

    3

  • Stát vydavatele periodika

    US - Spojené státy americké

  • Počet stran výsledku

    9

  • Strana od-do

    547-555

  • Kód UT WoS článku

    000604492600005

  • EID výsledku v databázi Scopus

    2-s2.0-85098638116