聚醚多元醇结晶性能对聚氨酯树脂氢键化及性能的影响

Effect of crystallization property of polyether polyol on hydrogen bonding and properties of polyurethane resin

以异佛尔酮二异氰酸酯和异佛尔酮二胺为硬段,聚环氧丙烷醚二醇(PPG)和聚四亚甲基醚二醇(PTMEG)为软段,合成了系列聚氨酯(PU)树脂。采用傅里叶变换红外光谱仪和热重分析仪考察了软段的结晶性及硬段含量对PU树脂的氢键化程度、热稳定性能及拉伸性能的影响。结果表明:以非结晶型PPG为软段的PU树脂的总氢键化程度较高,而以结晶型PTMEG为软段的的PU树脂具有较高的热分解温度和拉伸强度;随硬段含量增加,PPG型及PTMEG型PU树脂的总氢键化程度无明显改变,但失重5%的温度分别降低了6.4,4.3℃,拉伸强度分别增大了8.30,22.64 MPa。

A series of polyurethane（PU） resins were synthesized with isophorone diisocyanate and isophorone diamine as hard segment and polypropylene glycol（PPG）or polytetramethylene ether gly-col（PTMEG）as soft segment. The effects of crystallization of soft segment and hard segment content on hydrogen bonding, thermal stability and tensile property of the PU resins were studied by means of Fourier transform infrared spectroscopy（FTIR） and thermogravimetry（TG） analysis. The results in-dicated that the PU resins with non-crystallization type PPG as soft segment had higher total hydrogen bonding and those with crystallization type PTMEG as soft segment had higher thermal decomposition temperature and tensile strength.Wit h the increase of the hard segment, the total hydrogen bonding of PU resin with PPG and PTMEG had no apparent change, but the temperature of weight loss of 5% de-creased by 6.4,4.3 ℃ and tensile strength increased by 8.30,22.64 MPa, respectively.