Abstract
Urethane polymers possessing two conjugated -C≡C- triple bonds per repeating unit are synthesized. Polyurethanes are characterized by their infrared absorption spectra, UV abrsorption spectra and elementel analysis. Their molecular weights and limit intrinsic viscosities are determined. Solutions of these polymers in various solvents do not show any reactivity when exposed to light or heat. However the solid polyurethanes and solvent cast polyurethane films obtained from trimethyl hexamethylene diisocyanate, and isophoron diisocyanate quite rapidly develop red-brown colour on annealing at elevated temperatures, below their melting point. During this process the polymers themselves and solvent cast polymer films become insoluble in any of the solvents. Their IR and UV absorption spectra before and after annealing are examined and the band gaps are calculated from the spectral data.
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