Zinc containing poly(urethane–urea)s having ionic links in the main chain were synthesized by the reaction of hexamethylene diisocyanate or tolylene-2,4-diisocyanate with 1:1 mixture of zinc salt of mono(hydroxyethoxyethyl) phthalate and each of the bisureas such as hexamethylene-bis(ω,N-hydroxyethylurea), tolylene-2,4,-bis(ω,N-hydroxyethylurea), hexamethylene-bis(ω,N-hydroxypropylurea) and tolylene–2,4-bis(ω,N-hydroxypropylurea) using di-n-butyltin dilaurate as catalyst. These polymers were characterized by FT-IR, 1H NMR and 13C NMR spectroscopy, elemental analysis, solubility test, viscosity measurement and X-ray diffraction analysis. Thermal properties of the polymers were determined by differential scanning calorimetry and thermogravimetric analysis.
Dr. Jayakumar Rangasamy, Radhakrishnan, S., and Nanjundan, S., “Studies on Poly(urethane–urea)s Based on Zinc Salt of Mono[hydroxyethoxyethyl]phthalate”, Reactive and Functional Polymers, vol. 57, pp. 23 - 31, 2003.