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

摘要

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 degrees 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, H-1-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 degrees C and 116.8 degrees C, and an initial decomposition temperature of over 222.3 degrees C. A flexible TPUU exhibits a melting temperature of 77.7 degrees C, a tensile strength of 6.46 MPa, and an elongation at break of 180.20%.