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采用“原位”变温 FTIR研究了温度对交联聚氨酯脲结构的影响。结果表明 :随着温度的升高 ,氢键化的 NH振动的谱带面积逐渐变小、游离的 NH振动的谱带面积逐渐增加 ;氢键化的 NH基团的振动吸收位置由低波数逐渐移向高波数 ,游离的 NH振动的吸收位置保持不变 ;所有羰基的振动吸收位置均向高波数移动 ;酰胺 谱带及萃环中的大 π键的变形振动则移向低波数。聚氨酯脲弹性体的力学性能决定于其软段区的形态结构。
The effect of temperature on the structure of cross-linked polyurethane was studied by “in-situ” FTIR. The results show that as the temperature increases, the area of hydrogen-bonded NH vibrates becomes smaller and the area of free NH vibration increases gradually. The vibrational absorption position of hydrogen-bonding NH groups gradually increases from low wave number Shifted to the high wave number, and the absorption position of the free NH vibration remained the same; all the vibrational absorption positions of the carbonyl groups shifted toward the high wave number; the deformation vibration of the amide bond band and the large π bond in the extraction ring shifted to the low wave number. The mechanical properties of polyurethane urea elastomers are determined by the morphology of the soft segment.