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Characterization of functional aliphatic oligoamides using N-trifluoroacetylation. I. NMR analysis

The 1 H- and 13 C-NMR analysis of functional oligoamides was carried out after they had been modified by trifluoroacetic anhydride derivatization, leading to chloroform-soluble oligomers. The spectra of oligoamides-6, -11, -12, -6,6 and -6,10 were compared. The influence of the methylene group number on the CO amide chemical shift was studied by 13 C-NMR. The coupling constants J C-F and J C-C-F were also determined. Monomers, chain limiters and macromolecular structures were characterized and quantified from the 1 H- and 13 C-NMR spectral analysis. The number-average molar masses were also calculated from integration of the spectra and were compared with values obtained by end group chemical titration.