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Rheofluorescence Technique for the Study of Dilute MEH-PPV Solutions in Couette Flow

Hill, E. K.; Watson, R. L.; Dunstan, D. E.

Journal of fluorescence VOL 15; NUMBER 3, ; 2005, 255-266 -- Springer Science + Business Media (pages 255-266) -- 2005

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  • Title:
    Rheofluorescence Technique for the Study of Dilute MEH-PPV Solutions in Couette Flow
  • Author: Hill, E. K.;
    Watson, R. L.;
    Dunstan, D. E.
  • Found In: Journal of fluorescence VOL 15; NUMBER 3, ; 2005, 255-266
  • Journal Title: Journal of fluorescence
  • Subjects: Earth Sciences; LCC: TA357; Dewey: 549.125
  • Publication Details: Springer Science + Business Media
  • Language: English
  • Abstract: A novel rheofluorescence technique has been developed that permits the study of fluorescent polymers in a near-uniform shear field. The system has been used to examine the effects of shear flow on dilute solutions of two commercially available samples of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) in toluene and xylene. A detailed description of the instrument is provided, along with data that confirm a small probe molecule, Rhodamine 6G, is not affected by simple shear flow. MEH-PPV solutions were examined over two decades of concentration for rheochromism indicative of changes in segment length, and shear-induced orientation revealed by measurements of the steady state emission anisotropy. It is demonstrated that these dilute samples were not influenced by shear rates in the range 100–1000 s−1. In contrast, MEH-PPV dispersed in a concentrated polystyrene solution showed evidence of shear-induced orientation and rheochromism. This new technique shows promise for investigating the impact of shear flow on the conformation of conjugated polymers employed in organic optoelectronic devices.
  • Identifier: Journal ISSN: 1053-0509
  • Publication Date: 2005
  • Physical Description: Electronic
  • Shelfmark(s): 4984.525000
  • UIN: ETOCRN170684513

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