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

Abstract : Grevillea robusta, a Kenyan wood species of low durability was heat treated under inert atmosphere in laboratory conditions at temperatures between 220 and 250 degrees 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 Mason 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 C-13 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.
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https://hal.univ-lorraine.fr/hal-02102712
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Submitted on : Wednesday, April 17, 2019 - 3:54:30 PM
Last modification on : Friday, May 29, 2020 - 10:29:57 PM

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Francis Mburu, Stéphane Dumarcay, Jean-François Bocquet, Mathieu Petrissans, Philippe Gerardin. Effect of chemical modifications caused by heat treatment on mechanical properties of Grevillea robusta wood. Polymer Degradation and Stability, Elsevier, 2008, Volume 93 (Issue 2), pp.Pages 401-405. ⟨10.1016/j.polymdegradstab.2007.11.017⟩. ⟨hal-02102712⟩

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