Poly(parabanic acid)s. New aspects of structure–properties relationships

Polymers with parabanic units in the macromolecular chain were prepared by intermolecular reaction between various polyureas and oxalyl chloride. The influence of polymer structure on the heterocyclization process and on the properties of the resulting polymers are discussed. All polymers were characterized by elemental and thermogravimetric analyses, inherent viscosities, IR spectra, differential scanning calorimetry, X-ray diffraction, and electrical conductivity measurements.