This study incorporated polydimethylsiloxane (PDMS) and a kind of siloxane-based chain extender (SDO) into polyether urethanes (PEU). The correlation between microphase separation structure and mechanical properties, surface properties and wear resistance were investigated using multiple characterization techniques such as DSC, DMA, SAXS, ATR-FTIR, and XPS. The addition of PDMS significantly reduced the friction coefficient of PEU and enhances the hydrophobicity. The addition of SDO helped to improve the compatibility between PDMS and hard segments of PEU as proved by the fact that the glass transition temperatures of PDMS segments were shifted to higher temperatures and the fraction of loosely hydrogen-bonded carbonyls increased. Due to the improved interfacial adhesion between the immiscible segments, the wear resistance of PEU modified by both PDMS and SDO was obviously enhanced.

中文翻译：

---

含硅聚氨酯微相分离结构对其耐磨性的影响

该研究将聚二甲基硅氧烷（PDMS）和一种硅氧烷基扩链剂（SDO）纳入聚醚聚氨酯（PEU）中。采用 DSC、DMA、SAXS、ATR-FTIR 和 XPS 等多种表征技术研究了微相分离结构与机械性能、表面性能和耐磨性之间的相关性。 PDMS的添加显着降低了PEU的摩擦系数并增强了疏水性。 SDO的添加有助于改善PDMS和PEU硬链段之间的相容性，PDMS链段的玻璃化转变温度转移到更高的温度并且松散氢键羰基的比例增加这一事实证明了这一点。由于不相溶链段之间的界面粘合力提高，PDMS和SDO改性的PEU的耐磨性明显增强。