Significance of acid and heat treatment on non-conventional bonding of gian ipil-ipil (Leucaena leucocephala)

Mari E . L ., . and Kiguchi M ., . and Suzuki M ., . Significance of acid and heat treatment on non-conventional bonding of gian ipil-ipil (Leucaena leucocephala). pp. 48-61. ISSN 1394-2204

Chemical treatments which induce changes in wood to make it self-bonding are essential in non-conventional bonding. In this study chemical changes in wood due to nitric acid and heat treatments were analysed to elucidate the mechanisms involved in the formation of bonds. Electron Spectroscopy for Chemical Analysis spectra showed that the treatments caused an increase in carbonyl (C3) fraction which represents bonds due to some insoluble acids in wood. The increase in the amount of insoluble acids was high in the early stages of heating but decreased with longer heating times suggesting decarboxylation. In comparison soluble acids decreased progressively with heating. Infra-red spectral analysis confirmed that heating used up or reduced unreacted acids. Slight increases in lignin content after heating suggested partial resinfication of degraded wood components. From the above mentioned mechanism composite boards produced from milled wood rich in water-soluble fraction had superior qualities in modulus of rupture and thickness swelling.

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Abstract

Chemical treatments which induce changes in wood to make it self-bonding are essential in non-conventional bonding. In this study chemical changes in wood due to nitric acid and heat treatments were analysed to elucidate the mechanisms involved in the formation of bonds. Electron Spectroscopy for Chemical Analysis spectra showed that the treatments caused an increase in carbonyl (C3) fraction which represents bonds due to some insoluble acids in wood. The increase in the amount of insoluble acids was high in the early stages of heating but decreased with longer heating times suggesting decarboxylation. In comparison soluble acids decreased progressively with heating. Infra-red spectral analysis confirmed that heating used up or reduced unreacted acids. Slight increases in lignin content after heating suggested partial resinfication of degraded wood components. From the above mentioned mechanism composite boards produced from milled wood rich in water-soluble fraction had superior qualities in modulus of rupture and thickness swelling.

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Item Type:	Article
Additional Information:	Summaries (En Ms)
AGROVOC Term:	LEUCAENA LEUCOCEPHALA
AGROVOC Term:	WOOD
AGROVOC Term:	ACIDS
AGROVOC Term:	HEAT TREATMENT
AGROVOC Term:	ANALYTICAL METHODS
AGROVOC Term:	CHEMICAL COMPOSITION LEUCAENA LEUCOCEPHALA
AGROVOC Term:	MADERA
AGROVOC Term:	ACIDOS
AGROVOC Term:	TRATAMIENTO TERMICO
AGROVOC Term:	TECNICAS ANALITICAS
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:52
URI:	http://webagris.upm.edu.my/id/eprint/17895

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