A simple non-isocyanate route is developed for synthesizing crystallizable aliphatic thermoplastic poly（ester urethane） elastomers （TPEURs） with good thermal and mechanical properties. Three prepolymers of 1,6-bis...A simple non-isocyanate route is developed for synthesizing crystallizable aliphatic thermoplastic poly（ester urethane） elastomers （TPEURs） with good thermal and mechanical properties. Three prepolymers of 1,6-bis（hydroxyethyloxycarbonylamino） hexane （BHCH）, i.e. PrePBHCHs, were prepared through the self-transurethane polycondensation of BHCH. A poly（butylene adipate） prepolymer （PrePBA） with terminal HO-- groups was prepared and used as a polyester glycol. A series of TPEURs were prepared by the co-polycondensation of the PrePBHCHs with PrePBA at 170 ℃under a reduced pressure of 399 Pa. The TPEURs 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. The TPEURs exhibited Mn up to 23300 g/mol, Mw up to 51100 g/mol, Tg ranging from -33.8 ℃ to -3.1 ℃, Tm from 94.3 ℃ to 111.9 ℃, initial decomposition temperature over 274.7℃, tensile strength up to18.8 MPa with a strain at break of 450.0%, and resilience up to 77.5%. TPU elastomers with good crystallization and mechanical properties were obtained through a non-isocyanate route.展开更多
以TPU(热塑性聚氨酯弹性体)和ABS(丙烯腈-丁二烯-苯乙烯嵌段共聚物)为主要原料,采用熔融共混法制备了TPU/ABS复合材料。应用DSC(差示扫描量热)法分析了TPU/ABS复合材料的固化反应过程,并采用Kissinger方程和Crane方程计算出体系固化反...以TPU(热塑性聚氨酯弹性体)和ABS(丙烯腈-丁二烯-苯乙烯嵌段共聚物)为主要原料,采用熔融共混法制备了TPU/ABS复合材料。应用DSC(差示扫描量热)法分析了TPU/ABS复合材料的固化反应过程,并采用Kissinger方程和Crane方程计算出体系固化反应的动力学参数[如表观活化能(ΔE)、反应级数(n)和指前因子(Ak)等],进而得到相关的动力学模型函数。研究结果表明:体系固化反应的ΔE=85.3 k J/mol、n=0.762和Ak=1.9×10^(11),并且TPU/ABS复合材料的固化动力学模型机理函数符合双参数反应动力学模型。展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.21244006 and 50873013)
文摘A simple non-isocyanate route is developed for synthesizing crystallizable aliphatic thermoplastic poly（ester urethane） elastomers （TPEURs） with good thermal and mechanical properties. Three prepolymers of 1,6-bis（hydroxyethyloxycarbonylamino） hexane （BHCH）, i.e. PrePBHCHs, were prepared through the self-transurethane polycondensation of BHCH. A poly（butylene adipate） prepolymer （PrePBA） with terminal HO-- groups was prepared and used as a polyester glycol. A series of TPEURs were prepared by the co-polycondensation of the PrePBHCHs with PrePBA at 170 ℃under a reduced pressure of 399 Pa. The TPEURs 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. The TPEURs exhibited Mn up to 23300 g/mol, Mw up to 51100 g/mol, Tg ranging from -33.8 ℃ to -3.1 ℃, Tm from 94.3 ℃ to 111.9 ℃, initial decomposition temperature over 274.7℃, tensile strength up to18.8 MPa with a strain at break of 450.0%, and resilience up to 77.5%. TPU elastomers with good crystallization and mechanical properties were obtained through a non-isocyanate route.
文摘以TPU(热塑性聚氨酯弹性体)和ABS(丙烯腈-丁二烯-苯乙烯嵌段共聚物)为主要原料,采用熔融共混法制备了TPU/ABS复合材料。应用DSC(差示扫描量热)法分析了TPU/ABS复合材料的固化反应过程,并采用Kissinger方程和Crane方程计算出体系固化反应的动力学参数[如表观活化能(ΔE)、反应级数(n)和指前因子(Ak)等],进而得到相关的动力学模型函数。研究结果表明:体系固化反应的ΔE=85.3 k J/mol、n=0.762和Ak=1.9×10^(11),并且TPU/ABS复合材料的固化动力学模型机理函数符合双参数反应动力学模型。
