Molla Islam - Morphology of a hydrogen-bond mediated self-assembling small molecule in a polycarbonate matrix.

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  Publication Details (including relevant citation   information): Islam, Molla Rafiquel, Sundararajan, P.   R., Can. J. Chem., 2008, 86  (6), pp 600-607

  Abstract: Dispersing functional small mols. in a   polymer matrix is a well-known method of device fabrication for   optoelectronic applications. Normally, no specific interactions   such as hydrogen bonding occur between the polymer and the small   mol. The latter does not belong to the category of   "self-assembling" mols. When phase sepn. occurs, the small mol.   would diffuse to the surface and crystallize. In this paper, we   describe a very different morphol. behavior of hydrogen-bond   mediated self-assembling mols. in a polycarbonate matrix. We used   a series of biscarbamates with two hydrogen-bonding motifs and   alkyl side chain lengths sym. varying from C4 to C18. We infer   that the rate of self-assembly is faster than the diffusion of   the small mol. to the surface. As a result, crystn. of the small   mol. occurs predominantly in the bulk, i.e., sub surface, and not   on the surface of the polymer film.Key words: self-assembly,   crystn., diffusion, phase sepn. [on SciFinder(R)]

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