【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。更多还原

【Abstract】 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.更多还原