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Amorphous and Crystallizable Thermoplastic Polyureas Synthesized through a One-pot Non-isocyanate Route

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Abstract

A simple one-pot non-isocyanate route for synthesizing thermoplastic polyureas is presented. In situ urethanization was conducted from the ring-opening reaction of ethylene carbonate with poly(propylene glycol) bis(2-aminopropyl ether) and hexanediamine, m-xylylenediamine, or diethylene glycol bis(3-aminopropyl) ether at 100 °C for 6 h under normal pressure. Melt transurethane polycondensation was successively conducted at 170 °C under a reduced pressure of 399 Pa for different time periods. A series of nonisocyanate thermoplastic polyureas (NI-TPUreas) were prepared. The NI-TPUreas were characterized by gel permeation chromatography, FTIR, 1H-NMR, differential scanning calorimetry, thermogravimetric analysis, wide-angle X-ray diffraction, atomic force microscopy, and tensile test. NI-TPUreas exhibited Mn of up to 1.67 × 104 g/mol, initial decomposition temperature over 290 °C, and tensile strength of up to 32 MPa. Several crystallizable NI-TPUreas exhibited Tm exceeding 98 °C. NI-TPUreas with good thermal and mechanical properties were prepared through a green and simple one-pot non-isocyanate route.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 21244006) and Beijing Natural Science Foundation (No. 2182056).

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Authors and Affiliations

  1. Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology), Ministry of Education, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China

    Jia-Long Ban, Su-Qing Li, Chen-Feng Yi, Jing-Bo Zhao, Zhi-Yuan Zhang & Jun-Ying Zhang

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  1. Jia-Long Ban
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  2. Su-Qing Li
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Correspondence to Jing-Bo Zhao.

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Ban, JL., Li, SQ., Yi, CF. et al. Amorphous and Crystallizable Thermoplastic Polyureas Synthesized through a One-pot Non-isocyanate Route. Chin J Polym Sci 37, 43–51 (2019). https://doi.org/10.1007/s10118-018-2165-0

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