Detection of tacticity in polypropylenimine by 13C n.m.r.

13C Nuclear Magnetic Resonance Spectra of Poly(N-formylpropylenimine) and Some Related Formamide Derivatives

“…62901. cal mass distribution (i.e., random coil) at low pH to an elongated form at high pH. 2 The solution properties of PMA are also favorable with respect to high solubility and availability of an aqueous theta solvent.3 From the NMR standpoint the 13C spectrum of PMA is known to be considerably simpler than that of biopolymers in the same molecular weight range, and complications arising from stereochemical effects have been analyzed.4 Furthermore, the methyl groups attached to the PMA backbone provide an analogy to the side groups attached to the backbone of biopolymers. Such side groups may possess independent motional degrees of freedom quite different from those of the backbone.…”