The calculation of EMC for the analysis of wood-water relations in Fagus sylvatica L. modified with 1,3-dimethylol-4,5-dihydroxyethyleneureaReportar como inadecuado




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Wood Science and Technology

, Volume 44, Issue 4, pp 597–606

First Online: 19 December 2009Received: 07 February 2009

Abstract

Beech wood Fagus sylvatica L. was modified with 1,3-dimethylol-4,5-dihydroxyethyleneurea DMDHEU. The equilibrium moisture content EMC of wood modified with DMDHEU calculated on a dry modified basis is reduced. Previous results have shown that the modification with DMDHEU does not alter the capillary condensation; therefore, the reduction in EMC seems exaggerated. The equilibrium constants of the Hailwood–Horrobin model Kd and Kh and the molecular weight of a hypothetical polymer of modified wood capable of adsorbing one molecule of water Wi were calculated from the EMC on a dry modified wood basis M and on a dry wood basis MR. The hypothetical polymer was also calculated by stoichiometry Wc and compared to Wi to estimate the number of operative OH groups. The number of operative OH groups decreased when M was used, in contradiction with the previously obtained results of differential heat of adsorption ∆Hs. Therefore, the use of MR is recommended for the analysis of moisture sorption in wood modified with DMDHEU.

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Autor: Andrés Dieste - Andreas Krause - Carsten Mai - Holger Militz

Fuente: https://link.springer.com/







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