采用红外二向色性法对聚四氢呋喃醚二醇／4,4′-二苯基甲烷二异氰酸酯系聚氨酯薄膜样品的拉伸取向行为进行了研究，结果表明,随着拉伸倍率的增大,CH2角基团发生取向。当拉伸倍率大于80%时，NH基团也发生取向，即在外力作用下,软链段较易取向,而硬链段的取向较难。同时发现，在拉伸过程中，聚氨酯大分子中的氢键受到破坏。
In the paper, the orientation behaviors of polyurethane［poly(tetrahydrofuran／methylene diphenyl diisocyanate)］ film were investigated by means of infrared dichroism measurement. The results show that CH2 groups orient as draw ratio increases. NH groups orient too when draw ratio is beyond 80%, which indicates that it is easy for soft segments but difficult for hard segments to orient under the effect of outside force. It is also found that hydrogen bonds among polyurethane macromolecules were broken down during drawing process.
参考文献
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