二-(4-羟基丁基)聚二甲基硅氧烷改性聚氨酯/脲的合成及性能研究

摘要

以二-(4-羟基丁基)聚二甲基硅氧烷(HB - PDMS)和聚乙二醇为(PEG)软段,2,4-甲苯二异氰酸酯(TDI)为硬段,合成了一系列不同硬段含量的聚氨酯/脲(PU)和有机硅改性聚氨酯/脲(SiPU).通过FT - IR、DSC、TG及吸水率表征了PU和SiPU的结构及性能.结果表明,相对于PU,SiPU的耐水性随SiPU中HB - PDMS含量的增大而逐渐增强,聚硅氧烷的引入虽然降低了PU的初始热降解温度,但其在高温区的热稳定性增强.%Based on dihydroxybutyldimethylsilyl capped polydimethylsiloxane ( HB - PDMS) and polyethylene glycol (PEG) as the soft segment and 2,4 - toluenediisocyanate (TDI) as the hard segment, a series of polyurethane/urea ( PU) and silicone - modified polyurethane/urea (SiPU) with various hard segment content were prepared. The structures and properties of these polymers were characterized by Fourier Transfer infrared spectroscopy ( FT - IR) , differential scanning calorimetry ( DSC ) , thermal gravimetric analysis ( TG) and water absorption. The result showed that the water resistance of SiPU as well as the thermal stability was gradually increased with increasing the HB - PDMS content.