Modulating phase-separation in blends of MEHPPV-x with different conjugation lengths

Nagesh, K and Kabra, D and Narayan, KS and Ramakrishnan, S (2005) Modulating phase-separation in blends of MEHPPV-x with different conjugation lengths. In: Synthetic Metals, 155 (2). pp. 295-298.

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Abstract

We report here the phase-separation and energy transfer characteristics of segmented MEHPPV blends with two different distributions of conjugation lengths, namely MEHPPV-8 (LC, low conjugation length) and MEHPPV-100 (HC, high conjugation length). Thin films containing varying weight fractions of LC and HC were spin-cast from chloroform solutions. Photoluminescence studies of these thin films suggested that complete energy transfer from LC to HC occurred even though there was phase-separation. Selective chain-collapse of MEHPPV-100 by using a solution containing increasing volume fraction of cyclohexane for spin-coating allowed one to modulate the extent of energy transfer to some extent-typically the extent of energy transfer decreased in the presence of high volume fraction of cyclohexane.

Item Type:	Journal Article
Publication:	Synthetic Metals
Publisher:	Elsevier Science BV
Additional Information:	Copyright for this article belongs to Elsevier.
Keywords:	Segmented MEHPPV; MEHPPV-x blends; Confocal microscopy; UV-vis; Fluorescence of polymer blends
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	23 Jan 2006
Last Modified:	19 Sep 2010 04:23
URI:	http://eprints.iisc.ac.in/id/eprint/5193

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