Abstract
Samples of Hevea brasiliensis (Rubber wood) treated with dilute aqueous solution of chromium trioxide along with untreated specimens were exposed to artificially generated weathering conditions. Results show a severe deterioration of wood surfaces in untreated specimens which is mainly due to loss of lignin. IR spectroscopic analysis indicated an increase in the concentration of carbonyl chromophoric functional groups in exposed wood surfaces, whereas aromatic functional groups due to lignin decreased with irradiating time. Treatment of wood with an aqueous solution of chromium trioxide was found to restrict surface deterioration remarkably. DRIFT spectra obtained from exposed wood surfaces provide direct evidence of modification and stabilisation of lignin due to formation of a photo-stable complex in treated samples.
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