Abstract
A simple non-isocyanate route synthesizing thermoplastic polyurethanes (TPUs) with good thermal and mechanical properties is described. Melt transurethane polycondensation of dimethyl 1,6-hexamethylene dicarbamate with 1,4-butanediol and 1,6-hexanediol was conducted at different molar ratios under the catalysis of tetrabutyl titanate. A series of crystallizable non-isocyanate TPUs with high molecular weight were prepared. The TPUs were characterized by gel permeation chromatography, FT-IR, 1H-NMR, differential scanning calorimetry, thermogravimetric analysis, wide angle X-ray diffraction, AFM, and tensile tests. The TPUs exhibited Mn ranging from 12 500 to 26 400 g/mol, Mw from 16 700 to 56 400 g/mol, Tm up to 151.4 °C, and initial decomposition temperature over 241.8 °C. Their tensile strength reached 42.99 MPa with a strain at break of 30.00%. TPUs constructed simply with butylene, hexylene, and urethane linkages were successfully synthesized through a non-isocyanate route.
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Funded by the National Natural Science Foundation of China (Nos. 21244006 and 50873013), the Beijing Natural Science Foundation (No. 2182056)
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Li, S., Deng, Y., Zhao, J. et al. Synthesis and Properties of Non-isocyanate Crystallizable Aliphatic Thermoplastic Polyurethanes. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 33, 1275–1280 (2018). https://doi.org/10.1007/s11595-018-1963-0
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DOI: https://doi.org/10.1007/s11595-018-1963-0