Aliphatic thermoplastic polyurethane-ureas and polyureas synthesized through a non-isocyanate route

Article abstract of DOI:10.1039/c4ra12195c

A simple non-isocyanate route for synthesizing aliphatic thermoplastic polyurethane-ureas (TPUUs) and thermoplastic polyureas (TPUreas) is presented. Melt transurethane polycondensation of isophorone diamine or diethylene glycol bis(3-aminopropyl) ether with bis(hydroxyethyl) hexanediurethane, bis(hydroxyethyl) isophoronediurethane or bis(hydroxyethyl) piperazinediurethane was conducted at 170?°C under a reduced pressure of 3 mmHg. A series of thermoplastic TPUUs and TPUreas were prepared, and were characterized by gel permeation chromatography, FT-IR, ¹H-NMR, differential scanning calorimetry, thermogravimetric analysis, and tensile testing. The TPUUs and TPUreas have an M_n up to 14 900 g mol^-1, an M_w up to 43 700 g mol^-1, T_g between -18.6?°C and 116.8?°C, and an initial decomposition temperature of over 222.3?°C. A flexible TPUU exhibits a melting temperature of 77.7?°C, a tensile strength of 6.46 MPa, and an elongation at break of 180.20%.