New linear and cross-linked polyurethanes with cycloaliphatic units and renewable cross-linkers (Span 20 and Tween 20) were obtained by two steps polyaddition reaction. The degree of microphase separation was calculated by FTIR-ATR spectroscopy with higher values for the linear polyurethane with the highest hard segment content (0.88) and lower values for the cross-linked polyurethane with Tween 20 as cross-linker (0.35). The results were in accordance with the DSC analysis. The linear or cross-linked character of the polyurethane structure influenced the thermal, mechanical, and surface properties. The obtained polyurethanes had good thermal stability, with a 5% mass loss at 321°C (HMC 1) and 329°C (HMC 2) for linear polyurethanes and 330°C (HMC 3) and 342°C (HMC 4) for the cross-linked ones. The morphology and wettability of the cycloaliphatic polyurethanes presented different behavior depending on the amount of the hard segment content and also the chemical structure of the cross-linker. Linear polyurethanes were characterized by a globular morphology and hydrophobic character, while the use of Tween 20 as cross-linker led to a fibrillar morphology with a low water contact angle (62°). Mechanical measurements showed that all polyurethanes present elastomeric behavior with high tensile strength values for the linear polyurethanes (33 MPa for HMC 1 and 39 MPa for HMC 2) and lower values of tensile strength for the cross-linked ones (12 MPa for HMC 3 and 11 MPa for HMC 4), but high elongation at break for all samples (780%–1100%).

中文翻译：

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在硬链段中含有脂环族单元的新型聚氨酯。微观结构对热机械和表面性能的影响

通过两步加聚反应获得了具有脂环族单元和可再生交联剂（司盘 20 和吐温 20）的新型线性和交联聚氨酯。微相分离度通过 FTIR-ATR 光谱计算，具有最高硬链段含量 (0.88) 的线性聚氨酯的值较高，而以吐温 20 作为交联剂的交联聚氨酯的值较低 (0.35)。结果与DSC分析一致。聚氨酯结构的线性或交联特性影响热、机械和表面性能。所得聚氨酯具有良好的热稳定性，线性聚氨酯在 321°C (HMC 1) 和 329°C (HMC 2) 以及 330°C (HMC 3) 和 342°C (HMC 4) 下质量损失为 5%交联的。脂环族聚氨酯的形态和润湿性表现出不同的行为，这取决于硬链段含量的量以及交联剂的化学结构。线性聚氨酯的特征在于球形形态和疏水特性，而使用吐温 20 作为交联剂导致具有低水接触角 (62°) 的纤维状形态。机械测量表明，所有聚氨酯都呈现出弹性体行为，线性聚氨酯具有高拉伸强度值（HMC 1 为 33 MPa，HMC 2 为 39 MPa），而交联聚氨酯的拉伸强度值较低（HMC 3 为 12 MPa 和HMC 4) 为 11 MPa)，但所有样品的断裂伸长率都很高 (780%–1100%)。