Study on physicochemical properties of poly(ester-urethane) derived from biodegradable poly(ε-caprolactone) and poly(butylene succinate) as soft segments

Research paper by Wannarat Panwiriyarat, Varaporn Tanrattanakul, Narong Chueangchayaphan

Indexed on: 21 Oct '16Published on: 21 Oct '16Published in: Polymer Bulletin


Novel biodegradable polyester-based polyurethanes were developed based on poly(ε-caprolactone) diol (PCL diol) and poly(butylene succinate) diol (PBS diol) as the biodegradable soft segments (SS), and diisocyanate and 1,4-butanediol (BDO) as the hard segment (HS). The PBS diol (\( \overline{{M_{\text{n}} }} \) = 2000 g/mol) was successfully synthesized by melt condensation. The PBS diol and polyurethane sheets were characterized for chemical structure using NMR and FTIR techniques. The effect of hard segments and diisocyanate type on thermo-mechanical properties and hydrolytic degradation were examined by means of tensile testing, TGA, DSC and DMTA. The stress–strain curves of PURs reached the high 715 % elongation at break, 32.5 MPa tensile strength, and 123.8 MPa Young’s modulus. Increased hard segment content increased the tensile properties, thermal resistance and Tg, but the hydrolytic degradation rate decreased. The IPDI-based polyurethane gave lower tensile properties, Tg and hydrolytic degradation rate, but higher thermal stability than the TDI-based polyurethane.