Choudhury, Paramita Kar and Bagchi, Debjani and Menon, Reghu (2009) pi-conjugation and conformation in a semiconducting polymer: small angle x-ray scattering study. In: Journal of Physics: Condensed Matter, 21 (19). pp. 1-5.
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Small angle x-ray scattering (SAXS) in a poly[2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) solution has shown the important role of pi-electron conjugation in controlling the chain conformation and assembly. By increasing the extent of conjugation from 30 to 100%, the persistence length (l(p)) increases from 20 to 66 angstrom. Moreover, a pronounced second peak in the pair distribution function has been observed in a fully conjugated chain, at larger length scales. This feature indicates that the chain segments tend to self-assemble as the conjugation along the chain increases. Xylene enhances the rigidity of the PPV backbone to yield extended structures, while tetrahydrofuran solvates the side groups to form compact coils in which the lp is much shorter.
|Item Type:||Journal Article|
|Additional Information:||Copyrights of this article belongs to IOP Publications.|
|Department/Centre:||Division of Physical & Mathematical Sciences > Physics|
|Date Deposited:||18 Nov 2009 07:39|
|Last Modified:||19 Sep 2010 05:31|
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