Effect of chemical modifications caused by heat treatment on mechanical properties of Grevillearobusta wood

Author(s): Mburu F, Dumerçay S, Bocquet SF, Pétrissans M, Gérardin F


Grevillea robusta, a Kenyan wood species of low durability was heat treated under inert atmosphere in laboratory conditions at temperatures between 220 and 250 °C. Modulus of rupture (MOR) and modulus of elasticity (MOE) were determined for different heat treatment conditions. MOR and MOE reduced with increase in heat treatment weight loss. MOE reduced insignificantly for weight loss less than 16% while reduction of MOR was more significant. For a fixed heat treatment temperature by varying the treatment duration, sugar content was analysed by HPLC after acidic hydrolysis and Klason lignin was determined. The amount of sugars other than glucose decreased with treatment time and was near zero after 7 h, while lignin quantity increased gradually. Wood acidity determined by titration decreased after heat treatment indicating degradation of uronic acids present in hemicelluloses. Chemical modifications of wood components were determined by CP/MAS 13C NMR analysis. Spectra indicated significant degradation of hemicelluloses. Increase of treatment duration resulted in the appearance of new signals, particularly obvious on spectra of samples treated for 15 h, attributed to carbonaceous materials involved in char formation.

Similar Articles

Decomposition in Terrestrial Ecosystems

Author(s): Swift MJ, Heal OW, Anderson JM

Litter decomposition rates in Canadian forests

Author(s): Moore TR, Trofymow JA, Taylor B, Camiré C, Duchesne L, et al.

Microbial and Enzymatic Degradation of Wood and Wood Component

Author(s):  Eriksson KE, Blanchette RA, Anderson P

Restoring Soil Fertility in Sub-Sahara Africa

Author(s): Bekunda M, Sanginga N, Woomer PL

Microbial and Enzymatic Degradation of Wood and Wood Component

Author(s): Eriksson KE, Blanchette RA, Anderson P

Standard Test Method for Ash in Wood

Author(s): ASTM International

Biorefinery of paulownia by autohydrolysis and soda-anthraquinone delignification process

Author(s): García-Moralesa M, Minerva FL, Zamudio AM, Alfaro A, de Alva HE, et al.

Valorization of Leucaenaleucocephala for energy and chemicals from auto-hydrolysis

Author(s): Feria MJ, Lopez F, Garcia JC, Pérez A, Zamudio MAM, et al.

Biomass production and chemical composition of Moringaoleifera under different planting densities and levels of nitrogen fertilization

Author(s): Mendieta-Araica B, Spörndly E, Reyes-Sànchez N, Salmeron-Miranda F, Halling M

Investigation of the chemical modifications of beech wood lignin during heat treatment

Author(s): Brosse N, El Hage R, Chaouch M, Pétrissans M, Dumerçay S, et al.

La valorisation chimique du bois

Author(s): Dumon R, Gélus M