Influence of microfibril angle on thermal and dynamic-mechanical properties of Acacia mangium wood using x-ray diffraction and dynamics-mechanical test

Tabet, Tamer A. and Fauziah Abdul Aziz, (2010) Influence of microfibril angle on thermal and dynamic-mechanical properties of Acacia mangium wood using x-ray diffraction and dynamics-mechanical test. In: World Congress on Engineering 2010, WCE 2010, 30 June 2010 through 2 July 2010, London.

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Official URL: http://www.iaeng.org/publication/WCE2010/WCE2010_p...

Abstract

The term micofibril angle, MFA in wood science refers to the angle between the direction of the helical windings of cellulose microfibrils in the secondary cell wall, S2 layer of fibres and tracheids and the long axis of the cell. In this study, the main MFA of the cell walls were determined for thin samples of thickness 200μm from pith and outwards, for eight ages of Acacia mangium wood. The determination of MFA was based on diffraction pattern arising from cellulose crystal planes of the type 002 generated by x-ray diffraction and recorded using an electronic detector. The results show an inversely relationship between MFA and age of tree in Acacia mangium wood. MFA decreased from 26.13° at age 3 year-old to 0.20° at tree of age 15 year-old for the pith region. . The most significant drop occurred from 16.14° at age 7 year-old to 11.30° at age 9 year-old. An inversely relationship between MFA and storage modulus E' was evidence in Acacia mangium at age 10-year-old. The results showed that about 76.22% variation of loss modulus E" was attributed to the MFA, while about 66.4% of the variation of glass transition Tg was explained by MFA under the same experimental condition.

Item Type:Conference Paper (UNSPECIFIED)
Uncontrolled Keywords:Acacia mangium, Glass transition, MFA, Microfibril angle, X-ray diffraction
Subjects:?? TK8300-8360 ??
Divisions:SCHOOL > School of International Tropical Forestry
ID Code:3881
Deposited By:IR Admin
Deposited On:03 Apr 2012 17:03
Last Modified:30 Dec 2014 09:27

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