Poly(urethane-urea) based on functionalized polystyrene with HMDI: Synthesis and characterization

The poly(urethane-urea) (PUU) based on alpha, Omega, hydroxy terminated polystyrene (OHPSt-OH), 1,6-hexamethylene diisocyanate (HMDI) and three different diamines (1,2-ethylenediamine (EDA), 1,4-butanediamine (BDA), 1,6-hexamethylene diamine (HMDA)) is prepared by a melt polymerization method. The length of the soft segment is varying from 2000 to 8900 g/mol using HMDI as a chain extender. The inherent viscosity of the polymer is found to be in the range of 0.36-2.0 dL/g suggesting that the polymer is of high molecular weight. FT-IR results conclude that the urea groups form both monodendate and bidendate assemblies. Temperature dependent FT-IR and WAXS data confirm that the crystallinity of the copolymer is very high and depends on the spacer length. DSC data show the peaks for Tg of soft and Tm of hard segments. Depending on the concentration and the type of hard segments, melting temperature of the polymers was varied from 142 degrees C to 266 degrees C. The solubility of the polymer in chloroform is depending on the concentration of the hard segment. The TGA data reveal that the polymer shows single stage decomposition cantered around 413 degrees C. (C) 2015 The Authors. Published by Elsevier B.V. on behalf of King Saud University.