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Crystallizable and tough aliphatic thermoplastic poly(ether urethane)s synthesized through a non-isocyanate route

机译:通过非异氰酸酯途径合成的可结晶且坚韧的脂族热塑性聚醚聚氨酯

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摘要

A simple non-isocyanate route synthesizing aliphatic thermoplastic poly(ether urethane)s (PEUs) with good thermal and mechanical properties is described. Melt transurethane polycondensation of 1,6-bis(hydroxyethyloxy carbonyl amino) hexane (BHCH) with two ethylene glycol oligomers, i.e. triethylene glycol (3EG) and tetraethylene glycol(4EG), was conducted, and high molecular weight PEUs were prepared. The PEUs were characterized by gel permeation chromatography, FT-IR, H-1-NMR, differential scanning calorimetry, thermogravimetric analysis, wide angle X-ray scattering, and tensile tests. The PEUs exhibited M-n above 32 000, M-w above 54 300, T-g ranging from 11.2 degrees C to 28.2 degrees C, T-m from 103.7 degrees C to 150.6 degrees C, and initial decomposition temperature over 237.4 degrees C. A PEU prepared at a BHCH/4EG molar ratio of 5 : 1 exhibited the best mechanical properties with tensile strength of 32.82 MPa and strain at break of 151.82%. Some urea linkages were formed due to a back-biting side reaction in the transurethane polycondensation.
机译:描述了一种简单的非异氰酸酯路线,该路线合成了具有良好热和机械性能的脂肪族热塑性聚(醚氨基甲酸酯)(PEU)。 1,6-双(羟乙氧基羰基氨基)己烷(BHCH)与两种乙二醇低聚物,即三乙二醇(3EG)和四乙二醇(4EG)的熔融氨基甲酸酯缩聚反应,制备了高分子量PEU。通过凝胶渗透色谱,FT-IR,H-1-NMR,差示扫描量热法,热重分析,广角X射线散射和拉伸试验对PEU进行表征。 PEU的Mn高于32000,Mw高于54300,Tg为11.2摄氏度至28.2摄氏度,Tm为103.7摄氏度至150.6摄氏度,初始分解温度超过237.4摄氏度.PEU在BHCH / 5∶1的4EG摩尔比表现出最佳的机械性能,抗张强度为32.82MPa,断裂应变为151.82%。由于在氨基甲酸酯缩聚反应中发生的咬合副反应,形成了一些脲键。

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