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Intrinsic strain effect on crystal and molecular structure of (dch32) cotton fiber

Published online by Cambridge University Press:  01 March 2012

O. M. Samir and
R. Somashekar
O. M. Samir
Affiliation:
Department of Studies in Physics, University of Mysore, Manasagangothri, Mysore-570 006, India
R. Somashekar
Affiliation:
Department of Studies in Physics, University of Mysore, Manasagangothri, Mysore-570 006, India
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Abstract

X-ray diffraction pattern from cotton fiber (dch32) grown in the Karnataka state of India has been recorded. Fiber was found to contain 17 Bragg reflections, of which 11 are broadened because of crystal size and intrinsic strain influences. Contributions to integrated intensities from intrinsic strain in the fiber have been estimated using line profile analysis. A molecular model was first constructed with standard bond lengths and angles using helical symmetry and layer-line spacings observed in the X-ray pattern. The model was then refined against observed X-ray data using the linked atom least squares (LALS) method. The refinement has been done with and without the intrinsic strain correction to find the extent of structural changes. These changes have been quantified in terms of bond angles, bond lengths, and torsion angles. Young’s modulus has been estimated for these fibers using the results of line profile analysis, and a broad agreement with the reported physical measurements has been obtained.

Keywords

cotton fiberslattice strainYoung’s modulusWAXSLALS

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Type
Technical Articles
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Powder Diffraction , Volume 22 , Issue 1 , March 2007, pp. 20 - 26
Copyright
Copyright © Cambridge University Press 2007

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