Effects of steam treatment on bending properties and chemical composition of moso bamboo (Phyllostachys pubescens)

Zhao R. J., . and Jiang Z. H., . and Hse C. Y., . and Shupe T. F., . Effects of steam treatment on bending properties and chemical composition of moso bamboo (Phyllostachys pubescens). pp. 197-201. ISSN 0128-1283

Effects of temperature (25 160 and 200 C) and time (15 and 30 min) of steam treatment on the mechanical and chemical characteristics of moso bamboo were studied. The modulus of rupture (MOR) and modulus of elasticity (MOE) of the outer culm were at least 2.4 and 2.2 times respectively greater than those of the inner culm. Temperature and time had no effect on bending properties of the outer and inner culms. A significant decrease in MOR occurred after the specimens were subjected to 200 C. The per cent MOR reduction after 30 min treatment at 200 C was more than 33 and 29 respectively as compared with that of 25 and 160 C but steam treatment had no effect on MOE. Of the three major chemical constituents of bamboo alpha-cellulose was very stable to temperature and time but lignin content increased slightly when temperature was increased to 200 C. However the hemicellulose content decreased substantially as temperature increased. The similar decreases for hemicellulose content and MOR of bamboo suggested that hemicellulose loss in thermally-degraded bamboo was correlated with MOR strength loss. At 200 C there were significant decreases in MOR hemicellulose content and pH and increases in hot water extractives ethanol“benzene extractives 1 NaOH extractives and lignin content.

Full text available from: Official URL: http://www.frim.gov.my/v1/JTFSOnline/jtfs/v22n2/19...

Abstract

Effects of temperature (25 160 and 200 C) and time (15 and 30 min) of steam treatment on the mechanical and chemical characteristics of moso bamboo were studied. The modulus of rupture (MOR) and modulus of elasticity (MOE) of the outer culm were at least 2.4 and 2.2 times respectively greater than those of the inner culm. Temperature and time had no effect on bending properties of the outer and inner culms. A significant decrease in MOR occurred after the specimens were subjected to 200 C. The per cent MOR reduction after 30 min treatment at 200 C was more than 33 and 29 respectively as compared with that of 25 and 160 C but steam treatment had no effect on MOE. Of the three major chemical constituents of bamboo alpha-cellulose was very stable to temperature and time but lignin content increased slightly when temperature was increased to 200 C. However the hemicellulose content decreased substantially as temperature increased. The similar decreases for hemicellulose content and MOR of bamboo suggested that hemicellulose loss in thermally-degraded bamboo was correlated with MOR strength loss. At 200 C there were significant decreases in MOR hemicellulose content and pH and increases in hot water extractives ethanol“benzene extractives 1 NaOH extractives and lignin content.

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Item Type:	Article
AGROVOC Term:	Steam treatment
AGROVOC Term:	Chemical composition
AGROVOC Term:	Bamboos
AGROVOC Term:	Phyllostachys
AGROVOC Term:	Mechanical properties
AGROVOC Term:	Chemical properties
AGROVOC Term:	Elasticity
AGROVOC Term:	Lignins
AGROVOC Term:	Cellulose
AGROVOC Term:	Hemicellulose
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:27
URI:	http://webagris.upm.edu.my/id/eprint/21500

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