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  Determination of molecular orientational order in cold- stretched poly (p-phenylene vinylene) thin films by DECODER C- 13 NMR

Kropewnicki, M. L., Schaefer, D. J., Hehn, M., Dermaut, W., Geise, H. J., & Chmelka, B. F. (2002). Determination of molecular orientational order in cold- stretched poly (p-phenylene vinylene) thin films by DECODER C- 13 NMR. Solid State Nuclear Magnetic Resonance, 22(2-3), 275-297. doi:10.1006/snmr.2002.0082.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-6511-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-7A1C-7
Genre: Journal Article

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Kropewnicki, M. L., Author
Schaefer, D. J., Author
Hehn, M.1, Author              
Dermaut, W., Author
Geise, H. J., Author
Chmelka, B. F., Author
Affiliations:
1MPI for Polymer Research, Max Planck Society, ou_1309545              

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 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).

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Language(s): eng - English
 Dates: 2002-09
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: eDoc: 28454
ISI: 000179154400012
Other: P-02-143
DOI: 10.1006/snmr.2002.0082
 Degree: -

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Title: Solid State Nuclear Magnetic Resonance
Source Genre: Journal
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Publ. Info: San Diego, CA : Academic Press
Pages: - Volume / Issue: 22 (2-3) Sequence Number: - Start / End Page: 275 - 297 Identifier: ISSN: 0926-2040
CoNE: https://pure.mpg.de/cone/journals/resource/954925567752