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Green Gluing of Tropical Wood Part I: Surface Analysis of Frake (Terminalia superba) and Ayous (Triplochyton scleroxylon) Woods by X-Ray Photoelectron Spectroscopy (XPS) and FOURIER Transform InfraRed Spectroscopy (FTIR)

Author: 
Emmanuel Njungab, René Oum Lissouck, Hippolyte Ntede Ngah, Regis Pommier, Christine Labrugère, Louis Max Ayina Ohandja and Joseph Noah Ngamveng
Subject Area: 
Life Sciences
Abstract: 

X-Ray Photoelectron Spectroscopy and Fourier Transform Infra Red Spectroscopy (FTIR) were used, to characterize tropical ayous (triplochyton scleroxylon) and fraké (terminalia superba) sanded wood surface prior to gluing. As expected, O1s and C1s were the predominant species in the spectra of the two woods. C1s peak have been decomposed into several components. Earlier study reveled tree classes of carbon for frake. Unlike these result the two woods characterized in this work exhibit carbon atoms in classes C1 (carbon atoms bonded by a C-C or a C-H bond), C2 (carbon atoms bonded by C-O bond), C3 (carbon atoms bonded by C=O or by a O-C-O bond), C4 (carbon atoms bonded by O-C=O bond), C0 (carbon attributed to inhomogeous charges, and à non attributed carbon at 285,6 eV. The four principal classes were confirmed by FTIR. The oxygen-to-carbon (O/C) ratio of wood was determined. The deviation of the O/C ratios from theoretical values was interpreted as indicative of surface rich in lignin, surface hydrocarbon impurities or extractives and wood density.

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