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测量了对聚酯聚氨酯在浓溶液状态下质子自旋-晶格弛豫时间随温度的变化,对其中有代表性的基团进行了详细的研究,根据BPP理论用各向同性模型计算分子局部运动的相关时间,从计算结果来看,聚酯聚氨酯的局部分子运动是符合BPP理论的,硬链段的局部分子运动比软链段的局部分子运动要慢得多,两者相差至少一个数量级以上;质子的自旋-晶格弛豫时间主要是偶极-偶极作用的影响;强烈的氢键有相互作用使得硬链段基因的局部运动相关时间接近;通过形成氢键不同的NH峰的相关时间和活化能的观察可以研究软、硬段间的相互作用。
The change of proton spin-lattice relaxation time with temperature in concentrated solution of polyurethane was measured and the representative groups were studied in detail. According to BPP theory, the molecular local From the calculation results, the local molecular motions of polyester polyurethane are in accordance with BPP theory. The local molecular motions of hard segments are much slower than the local molecular motions of soft segments, and the difference between them is at least an order of magnitude ; The proton spin-lattice relaxation time is mainly the effect of dipole-dipole interaction; strong hydrogen bonding interaction makes the local movement of hard segment genes related to the time; through the formation of hydrogen bonds with different NH peak The correlation between time and activation energy can be used to study the interaction between soft and hard segments.