FTIR studies of conformational disorder: crystal perfecting in long chain n-alkanes

GORCE, J. P. and SPELLS, S. J. (2004). FTIR studies of conformational disorder: crystal perfecting in long chain n-alkanes. Polymer, 45 (10), 3297-3303.

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Abstract

The low temperature FTIR spectra of long chain n-alkanes C198H398 and C246H494, crystallised from solution in both extended and once-folded forms, have been investigated in the CH2 wagging region. Successive annealing and cooling stages result in a significant reduction in the number of non-planar C–C bond conformers in all cases. This is evidence of a ‘perfecting’ process within the crystals. The time dependence of this behaviour shows that, on raising the annealing temperature, the level of disorder reaches a maximum before declining. In addition, in a continuous heating run on once-folded C198H398, all types of conformational disorder except end-gauche bonds are shown to pass through a maximum near 118 °C, in the region of the transformation to extended chain crystals

Item Type:	Article
Additional Information:	Copyright © 2004 Elsevier Ltd.
Research Institute, Centre or Group:	Materials and Engineering Research Institute > Polymers Nanocomposites and Modelling Research Centre > Polymers, Composites and Spectroscopy Group
Identification Number:	10.1016/j.polymer.2004.03.034
Depositing User:	Ann Betterton
Date Deposited:	09 Aug 2007
Last Modified:	09 Aug 2010 13:59
URI:	http://shura.shu.ac.uk/id/eprint/951

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