Kinetic parameters for thermal decomposition of supramolecular polymers derived from flunixin-meglumine adducts |
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Authors: | Douglas L Cassimiro Clóvis A Ribeiro Jorge M V Capela Marisa S Crespi Marisa V Capela |
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Institution: | 1.Institute of Chemistry,Paulista State University,Araraquara,Brazil |
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Abstract: | Meglumine, (2R,3R,4R,5S)-6-methylaminohexane-1,2,3,4,5-pentol, is a carbohydrate derived from sorbitol in which the hydroxyl group in position one
is replaced by a methylamine group. It forms binary adducts with substances having carboxyl groups, which have in common the
presence of hydrogen bonding as the main force in the stabilization of these species. During melting, adducts of meglumine
with flunixin (2-2-methyl-3-(trifluoromethyl)phenyl]amino]pyridine-3-carboxylic acid) polymerize or self-assemble in amorphous
supramolecular structures with molecular weights around 2.0 × 105 kDa. DSC curves, in a first heating, show isomorphic transitions where the last one at 137 °C for the flunixin-meglumine
adduct originated the supramolecular amorphous polymers with glass transition around 49.5 °C. The kinetic parameters for the
thermal decomposition step of the polymers were determined by the Capela-Ribeiro non-linear isoconversional method. From data
for the TG curves in nitrogen atmosphere and heating rates of 5, 10, 15, and 20 °C min−1, the E
α and B
α terms could be determined and, consequently, the pre-exponential factor, Aα, as well as the kinetic model, g(α). |
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