Abstract Polysiloxane-based polyurethane films with cross-linked structure are synthesized by the sol-gel process using isophorone diisocyanate (IPDI), polydimethylsiloxane (PDMS), polycaprolactone (PCL) diol, and 3-aminopropyl triethoxysilane (ATS). After the ATS-terminated polyurethane prepolymer, a cross-linked network structure is formed through the process of dehydration and condensation. The hydrophobicity, thermal properties, surface morphology, and mechanical properties of a series of polysiloxane-based polyurethane films with cross-linked structure are further studied. Dynamic mechanical thermal analysis studies show that the crosslink density of polysiloxane-based polyurethane films with cross-linked structure is improved with the addition of ATS. Polysiloxane-based polyurethane films with cross-linked structure can not only enhance mechanical strength but also improve heat resistance and hydrophobicity. The results show that the maximum decomposition temperature of the polysiloxane-based polyurethane films with cross-linked structure reaches 475 °C, the hydrophobicity increases to 114.2°, and the mechanical strength increases to 16.7 Mpa, which are 18.75%, 7.53%, and 59.04% higher than that of the control group, respectively. This is mainly due to the cross-linked network structure formed by the sol-gel process, which limits the movement of the segment and increases the rigidity of the material. Besides, a dense protective layer is formed on the surface due to cross-linking, which prevents the infiltration of water molecules. Interestingly, with the increase of ATS, the R q value of the surface shows an increasing trend. This is in contrast to the study by Kamal Mohamed Seeni Meera et al. Who shows that the R q value decreases with increasing crosslink density. Also, it can be seen from the results of XPS characterization that Si element of the surface is increased, which is mainly due to the sol-gel phenomenon of ATS occurring on the surface of the material.

中文翻译：

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溶胶-凝胶法制备的具有交联结构的耐高温疏水聚硅氧烷基聚氨酯薄膜

摘要 采用异佛尔酮二异氰酸酯 (IPDI)、聚二甲基硅氧烷 (PDMS)、聚己内酯 (PCL) 二醇和 3-氨基丙基三乙氧基硅烷 (ATS)，通过溶胶-凝胶法合成了具有交联结构的聚硅氧烷基聚氨酯薄膜。ATS封端的聚氨酯预聚体经过脱水和缩合的过程形成交联的网络结构。进一步研究了一系列具有交联结构的聚硅氧烷基聚氨酯薄膜的疏水性、热性能、表面形貌和机械性能。动态力学热分析研究表明，具有交联结构的聚硅氧烷基聚氨酯薄膜的交联密度随着ATS的加入而提高。具有交联结构的聚硅氧烷基聚氨酯薄膜不仅可以增强机械强度，还可以提高耐热性和疏水性。结果表明，交联结构聚硅氧烷基聚氨酯薄膜的最高分解温度达到475℃，疏水性增加到114.2°，机械强度增加到16.7Mpa，分别为18.75%、7.53%和16.7Mpa。分别比对照组高59.04%。这主要是由于溶胶-凝胶过程形成的交联网络结构，限制了片段的运动，增加了材料的刚性。此外，由于交联，在表面形成致密的保护层，防止水分子渗入。有趣的是，随着 ATS 的增加，表面的 R q 值呈增加趋势。这与 Kamal Mohamed Seeni Meera 等人的研究相反。谁表明 R q 值随着交联密度的增加而降低。另外，从XPS表征的结果可以看出，表面的Si元素有所增加，这主要是由于材料表面发生了ATS的溶胶-凝胶现象。