Polyesters containing sulfur. VIII. New benzophenone-derivative thiopolyesterdiols synthesis and characterization. Their use for thermoplastic polyurethanes preparation

The new linear thiopolyesterdiols (PEs) containing sulfur in the main chain were synthesized by melt polycondensation of newly obtained benzophenone-4 ,4'-bis(methylthioacetic acid) with excess of 1,4-butanediol, 1,5-pentanedi ol, and 1,6-hexanediol. All these PEs ((M) over bar(n) of 2000-2600) were c onverted to thiopoly(ester-urethane)s (PEUs) by polyaddition reaction with hexamethylene diisocyanate or 4,4'-diphenyl-methane diisocyanate, which was carried out in melt at the ratio of NCO/OH = 1. The resulting thermoplasti c PEUs were amorphous and elastomeric, with elongation at break ranging fro m 630 to 1200%. The polymers were characterized by Fourier transform infrar ed, H-1 NMR, thermogravimetric analysis, differential scanning calorimetry, and in the case of PEUs, Shore A/D hardness and tensile properties. (C) 20 00 John Wiley & Sons, Inc.