Abstract
Interpolymer complexes of microbial poly(ɛ-L-lysine) (ɛ-PL) and poly(acrylic acid) (PAA) were studied by Fourier transform infrared spectroscopy, differential scanning calorimetry and solid-state 13C and 15N nuclear magnetic resonance (NMR) experiments. These measurements suggested the poly-ionic complex formation between ɛ-PL and PAA, ɛ-PL-H3N+···−OOC-PAA. By analyzing 13C NMR spectra of the complex, we concluded that there exist three forms of the carboxyl group of PAA, namely: (1) the ionized form, interpolymer ion-complex between ɛ-PL and PAA, (2) the dimeric form, intrapolymer hydrogen bonding among PAA molecules and (3) the free form, no particular form of hydrogen bonding.
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