Abstract Silicone elastomers with adjustable self-healing and mechanical properties have been prepared by the step-by-step synthesis procedure that 4,4′-methylenebis-(cyclohexyl isocyanate) (HMDI) and isophthalaldehyde (IPAL) sequentially cross-linked with aminopropyl terminated polydimethylsiloxane (AP-PDMS). The characteristic imine and urea groups that related to self-healing ability and toughness have been detected in the silicone elastomers. The tensile stress of elastomers increases from ∼3 KPa to ∼1.0 MPa as increasing the ratio of urea to imine groups (0.35–3.3), while the elongation at the break still keeps in the range of 700−800 %. It was verified that the hydrogen bonding network exists in the self-healing polymers, which is responsible for its enhanced mechanical properties. The dynamic interaction of imine groups decreases with the increase of urea groups due to the limited movement of the polymer chain by hydrogen bonds, resulting in the degeneration of self-healing properties. Expectedly, the self-healing polymer (PDMS-UI-2) exhibits outstanding protective ability against corrosion of carbon steel in 3.5 % NaCl solution, owing to its rapid self-repairing property. Therefore, this work provides a facile and effective method to fabricate the self-healing silicon materials with adjustable self-repairing capability and mechanical property, which can be potentially used as protective coatings in the marine environment.

中文翻译：

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具有可控自愈性和韧性的有机硅保护材料的设计制备

摘要 4,4'-亚甲基双（异氰酸环己酯）（HMDI）和间苯二醛（IPAL）依次与氨基丙基末端交联，通过分步合成方法制备了自愈性和机械性能可调的有机硅弹性体。聚二甲基硅氧烷 (AP-PDMS)。在有机硅弹性体中检测到与自修复能力和韧性相关的特征亚胺和脲基团。随着尿素与亚胺基团的比例（0.35-3.3）的增加，弹性体的拉伸应力从~3 KPa 增加到~1.0 MPa，而断裂伸长率仍保持在 700-800% 的范围内。经证实，自修复聚合物中存在氢键网络，这是其机械性能增强的原因。由于氢键限制了聚合物链的运动，亚胺基团的动态相互作用随着脲基团的增加而降低，导致自修复性能退化。可以预期，自修复聚合物（PDMS-UI-2）由于其快速自修复特性，在3.5% NaCl溶液中表现出出色的碳钢腐蚀防护能力。因此，这项工作为制备具有可调自修复能力和机械性能的自修复硅材料提供了一种简便有效的方法，可作为海洋环境中的保护涂层。自修复聚合物（PDMS-UI-2）由于其快速自修复特性，在3.5% NaCl溶液中表现出出色的碳钢腐蚀防护能力。因此，这项工作为制备具有可调自修复能力和机械性能的自修复硅材料提供了一种简便有效的方法，可作为海洋环境中的保护涂层。自修复聚合物（PDMS-UI-2）由于其快速自修复特性，在3.5% NaCl溶液中表现出出色的碳钢腐蚀防护能力。因此，这项工作为制备具有可调自修复能力和机械性能的自修复硅材料提供了一种简便有效的方法，可作为海洋环境中的保护涂层。