Abstract
Hexamethylene diisocyanate (HMDI) based polyurethane-urea-amide (PUUA) is synthesized using diamide chain extenders and dihydroxy polystyrene. The rigid segment structure is HMDI-6X6-HMDI. The repeating molecular weight of the soft segment is varied from 2678 to 9202 g mol−1 using HMDI as a chain extender. The inherent viscosity of the polymer is 1.3–3.9 dL g−1. Tm of PUUA varies between 239 and 265 °C. The crystallinity of the amide segments is up to 70%. The polymers show single-stage decomposition temperature around 415 °C. WAXS data confirm the semi-crystalline nature of the polymer. The solvent resistivity of the polymer in chloroform is high due to high crystallinity of the hard segment.
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