可自修复高拉伸硅烷封端聚脲弹性体的研制

以氨基封端聚二甲基硅氧烷、氨基封端聚醚等为原料合成了5种硅烷封端聚脲弹性体(SPUR1～5),采用傅里叶变换红外光谱仪、核磁共振氢谱仪、扫描电子显微镜、热重分析仪、动态热机械分析仪研究了SPUR的结构、热稳定性、拉伸性能、储能模量、损耗模量、自修复性能.结果表明,成功制得了SPUR,SPUR中的氨基封端聚二甲基硅氧烷和...

Preparation of Self-healing,High-stretching Silane-terminated Polyurea Elastomer

Five silane-terminated polyurea elastomers(SPUR 1~SPUR 5)have been synthesized by using amino-terminated polydimethylsiloxane and amino-terminated polyether as raw materials.The structure,thermal stability,tensile properties,storage modulus,loss modulus,and self-healing properties of SPUR have been studied by Fourier transform infrared spectrometer(FT-IR),nuclear magnetic resonance spectrometer(¹H NMR),scanning electron microscope(SEM),thermogravimetric analyzer(TGA)and dynamic thermomechanical analyzer(DMA).The results show that SPUR has been successfully prepared,in which amino-terminated polydimethylsiloxane and polyether is selected as the soft segment to provide elastic properties,while isophorone diisocyanate(IPDI)and N-butylaminomethyltriethoxy are attributed to the hard segment to provide mechanical properties,such as rigidity and strength.SPUR has an excellent elasticity and thermal stability.Among them,SPUR2 has the best self-healing performance,both retention rate of tensile strength and elongation at break after 70℃×48 h are 96%.The retention rate of tensile strength after 48 h of immersion in the room temperature is 78%while the retention rate of elongation at break is 76%.SPUR is expected to be applied in construction,transportation,medical devices,coatings,electronic packaging and lithium-ion batteries.