Crystallizable and Tough Aliphatic Thermoplastic Polyureas Synthesized through a Nonisocyanate Route

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• 作者：Suqing Li ; Zhihui Sang ; Jingbo Zhao ; Zhiyuan Zhang ; Junying Zhang ; Wantai Yang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：February 24, 2016
• 年：2016
• 卷：55
• 期：7
• 页码：1902-1911
• 全文大小：608K
• ISSN：1520-5045

文摘

A simple nonisocyanate route for synthesizing crystallizable and tough aliphatic thermoplastic polyureas (TPUreas) is described. Melt transurethane polycondensation of diethylene glycol bis(3-aminopropyl) ether with bis(hydroxyethyl) hexanediurethane and bis(hydroxyethyl) isophoronediurethane was conducted at 170 °C under a reduced pressure of 3 mmHg, and a series of TPUreas were prepared. The TPUreas were characterized by GPC, FT-IR, ¹H NMR, ¹³C NMR, 2D ¹³C–¹H HSQC NMR, DEPT-135 ¹³C NMR, DSC, TGA, wide-angle X-ray scattering, atomic force microscopy, and tensile tests. The TPUreas exhibited an M_n up to 12 000 g/mol, an M_w up to 17 600 g/mol, T_g between 2.8 and 18.1 °C, T_m from 140.5 to 149.8 °C, initial decomposition temperature of over 278.4 °C, and tensile strength up to 37.81 MPa with elongation at break of 691.25%. TPUreas with high T_m, good tensile strength, and good toughness were prepared through a nonisocyanate route.