Abstract Polycarbonate-based thermoplastic polyurethane elastomers (PCD-TPUs) were synthesized from polyhexamethylene carbonate diol, 4,4-diphenylmethane diisocyanate and 1,4 butanediol, intended for adhesive applications. The chemical structure, thermal transition temperature, phase separation morphology, mechanical properties, and adhesion properties were studied to elucidate the structure-properties relationship of PCD-TPUs as a function of hard segment content. The phase separation behavior was described as a shift of the glass transition temperature and the dimension size of the hard domain. It was found that the higher hard segment fraction led to a lower degree of phase separation as well as a reduction in tensile strength and elongation at break. The hydrogen bonding characteristic of PCD-TPUs was investigated by FTIR. The presence of free hydrogen bonded PCD-TPUs benefits the higher peel strength since it promotes hydrogen bonding interaction with the substrate. The peel strength was obtained from PCD-TPUs/stainless steel joint. The adhesion properties of the adhesive system were strongly influenced by the soft segment. These results can establish the possibility of designing new formulations for hot melt adhesive.

中文翻译：

---

热塑性聚氨酯基聚碳酸酯二醇热熔胶：软硬段比对粘合性能的影响

摘要 聚碳酸酯基热塑性聚氨酯弹性体 (PCD-TPU) 由聚六亚甲基碳酸酯二醇、4,4-二苯基甲烷二异氰酸酯和 1,4 丁二醇合成，用于粘合剂应用。研究了化学结构、热转变温度、相分离形态、机械性能和粘合性能，以阐明 PCD-TPU 的结构-性能关系作为硬链段含量的函数。相分离行为被描述为玻璃化转变温度和硬域尺寸的变化。发现较高的硬链段分数导致较低程度的相分离以及拉伸强度和断裂伸长率的降低。通过FTIR研究了PCD-TPUs的氢键特性。游离氢键 PCD-TPU 的存在有利于提高剥离强度，因为它促进了与基材的氢键相互作用。剥离强度是从 PCD-TPU/不锈钢接头获得的。粘合剂体系的粘合性能受软链段的强烈影响。这些结果可以确立为热熔胶设计新配方的可能性。