The polycaprolactone( PCL) with number⁃average molecular weight of 2000 and a narrow molecular weight distribution was synthesized and characterized. Then a series of polycaprolactone⁃based thermoplastic polyu⁃rethane elastomers ( PCL⁃TPU ) with different hard segment content were synthesized using PCL as the soft segment, 4,4′⁃diphenyl methane diisocyanate ( MDI) and 1,4⁃butanediol ( BDO) as the hard segment. The struc⁃ture, crystallization properties and mechanical properties were characterized and studied by GPC, DSC and tensile test. The results showed that the crystallization ability was decreased and the tensile strength and hardness were in⁃creased when the hard segment content increased. In addition, the PCL⁃TPU with excellent strength and toughness was prepared when the hard segment content was 38�7%.%合成了相对分子质量为2000且相对分子质量分布较窄的聚己内酯二醇（ PCL），并进行分析表征。以自制PCL、4，4′⁃二苯基甲烷二异氰酸酯和1，4⁃丁二醇为原料，制备了不同硬段含量的PCL型热塑性聚氨酯弹性体（ PCL⁃TPU）。通过GPC、DSC、拉伸等测试手段对其结构和性能等进行了研究。结果表明，随着硬段含量的增加，产物结晶的能力变差，拉伸强度及硬度增大，当硬段质量分数为38�7％时，可以获得韧性和强度都较好的PCL⁃TPU。
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