Publication
Title
Determination of molecular orientational order in cold-stretched poly (p-phenylene vinylene) thin films by DECODER C-13 NMR
Author
Abstract
The properties of polyp-phenylene vinylene) (PPV) films depend on the degree of orientational order present in the films. Recently, Dermaut et al. reported a novel cold-stretching technique (Macromolecules 33, 5634-5637 (2000)) in which chain alignment can be introduced into PPV precursor films by uniaxially stretching them prior to the thermal elimination reaction that forms PPV. The two-dimensional direction exchange with correlation for orientation-distribution evaluation and reconstruction (DECODER) C-13 NMR technique was applied to both unstretched PPV films and PPV films that were uniaxially cold stretched to a draw ratio lambda = l/l(0) = 5. The unstretched films were found to be moderately ordered, comprised of a component present at 80% with a Gaussian distribution of 60degrees fwhm, while the remaining 20% is isotropically distributed. A distribution of 9 3 fwhm was measured by NMR in good agreement with IR dichroism measurements for the uniaxially cold-stretched films, establishing that a high degree of orientational order can be introduced by cold stretching PPV films. (C) 2002 Elsevier Science (USA).
Language
English
Source (journal)
Solid state nuclear magnetic resonance. - Amsterdam
Publication
Amsterdam : 2002
ISSN
0926-2040
Volume/pages
22:2-3(2002), p. 275-297
ISI
000179154400012
Full text (Publisher's DOI)
Full text (publisher's version - intranet only)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 29.02.2012
Last edited 21.06.2017
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