Solvent-mediated fiber growth in organogels

Dasgupta, Debarshi ; Srinivasan, Sampath ; Rochas, Cyrille ; Ajayaghosh, Ayyappanpillai ; Guenet, Jean-Michel (2011) Solvent-mediated fiber growth in organogels Soft Matter, 7 (19). pp. 9311-9315. ISSN 1744-683X

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We have investigated the decisive role of the solvent type in the gelation of an oligo(p-phenylene vinylene) molecule with OH functions on the terminal groups (OPVOH). We show that gels of “hub-like” morphology are obtained with benzyl alcohol, a solvent that mimics the chemical structure of the terminal groups, whereas a “randomly dispersed” morphology is obtained with trans-decahydronaphthalene and with benzyl methyl ether, a solvent very similar to benzyl alcohol except that the hydrogen of the OH function has been replaced by a CH3 group. Also, the thermodynamic behaviour, gel formation and gel melting are similar for benzyl methyl ether and trans-decahydronaphthalene but are significantly different in benzyl alcohol: the gel melting point is higher, and so is the melting enthalpy. Extrapolation of this parameter to 100% OPVOH gives a value significantly higher than that directly measured on pure OPVOH. Molecular organization as studied by X-ray diffraction and fluorescence properties follow the same trend. The occurrence of a molecular compound between OPVOH and benzyl alcohol is contemplated in an attempt to account for these outcomes.

Item Type:Article
Source:Copyright of this article belongs to Royal Society of Chemistry.
ID Code:96145
Deposited On:05 Dec 2012 09:25
Last Modified:05 Dec 2012 09:25

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