STUDIES ON ZINC-CONTAINING POLYURETHANES AND POLYURETHANE-UREAS

ABSTRACT

Zinc salt of mono(hydroxypentyl)phthalate [Zn[HPP]₂] was synthesized by reacting 1,5-pentane diol, phthalic anhydride and zinc acetate. Zinc containing polyurethanes having ionic linkages in the main chain were synthesized by the polyaddition reaction of hexamethylene diisocyanate (HMDI) or toluylene 2,4-diisocyanate (TDI) with Zn[HPP]₂, using di-n-butyltin dilaurate (DBTDL) as catalyst. Four different bisureas were prepared by reacting ethanolamine or propanolamine with HMDI or TDI. Zinc containing polyurethane-ureas were synthesized by reacting HMDI or TDI with 1:1 mixtures of Zn[HPP]₂ and each of the bisureas. Zn[HPP]₂ and the polymers were characterized by solubility, viscosity study, elemental analysis, FT-IR,¹H-NMR,¹³C-NMR spectroscopy and thermogravimetric analysis (TGA).

Keywords:

• Zinc salt of mono(hydroxypentyl)phthalate
• Ionic monomer
• Bisureas
• Polyurethanes
• Polyurethane-ureas
• Thermogravimetric analysis and spectral studies

ACKNOWLEDGMENT

R. Jayakumar gratefully acknowledges the award of a senior Research Fellowship by the C.S.I.R., India for his research work.