Low temperature crystallographic data on Kevlar 49 fibres

Iyer, RV and Sooryanarayana, K and Row, TNG and Vijayan, Kalyani (2003) Low temperature crystallographic data on Kevlar 49 fibres. Journal of Material Science, 38. pp. 133-139. ISSN 0022-2461

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Abstract

Using X-ray diffraction data, the behaviour of Kevlar49 fibres at lowtemperatures, up to -100xB0;C, has been analysed. During cooling, the basal plane of the monoclinic unit cell13; shrinks whereas the c- (unique, chain axis) length is not significantly affected. In contrast, in the return heating cycle to ambient temperature, the basal plane expands and contraction occurs along the chain direction. The unit cell registers a reduction in volume in both the cooling and heating cycles. Conspicuously,after a cycle of cooling and heating, the unit cell does not return to its initial volume.

Item Type:	Article
Additional Information:	Copyright for this article belongs to Kluwer Academic Publishers
Uncontrolled Keywords:	X-ray diffraction;Crystallographic data;Fibres
Subjects:	CHEMISTRY AND MATERIALS > Composite Materials CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User:	M/S ICAST NAL
Date Deposited:	17 Oct 2006
Last Modified:	09 Sep 2015 05:07
URI:	http://nal-ir.nal.res.in/id/eprint/3026

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