Division of Semiconductor and Chemical Engineering, Chonbuk National University, Baekjedaero 567, Jeonju 54896, Korea.
Molecules. 2018 Nov 9;23(11):2928. doi: 10.3390/molecules23112928.
Azomethine diols (AMDs) were synthesized by condensation between a terephthalic aldehyde, polyether diamine, and ethanol amine. The synthesized AMDs were employed to introduce azomethine groups into the backbones of polyurethane elastomers (PUEs). Different AMDs were designed to control the concentration and distribution of azomethine groups in PUEs. In this study, we explored the intrinsic self-healing of AMD-based PUEs by azomethine metathesis. Particularly, the effects of the concentration and distribution of the azomethine groups on the AMD-based PUEs were considered. Consequently, as the azomethine group concentration increased and the distribution became denser, the self-healing properties improved. With AMD3-40, the self-healing efficiency reached 86% at 130 °C after 30 min. This represents a 150% improvement over the control PUE. Additionally, as the AMD content increased, the mechanical properties improved. With AMD3-40, the tensile strength reached 50 MPa. Therefore, we concluded that the self-healing and mechanical properties of PUEs can potentially be tailored for applications by adjusting the concentration and design of AMD structure for PUEs.
吖嗪二酮（AMDs）是通过对苯二甲醛、聚醚二胺和乙醇胺之间的缩合反应合成的。合成的 AMD 被用于将吖嗪基团引入到聚氨酯弹性体（PUE）的主链中。设计了不同的 AMD 来控制 PUE 中吖嗪基团的浓度和分布。在这项研究中，我们通过吖嗪复分解反应探索了基于 AMD 的 PUE 的内在自修复性能。特别是，考虑了吖嗪基团的浓度和分布对基于 AMD 的 PUE 的影响。结果表明，随着吖嗪基团浓度的增加和分布的密集化，自修复性能得到了提高。在 130°C 下 30 分钟后，使用 AMD3-40 时，自修复效率达到了 86%。这比对照 PUE 提高了 150%。此外，随着 AMD 含量的增加，力学性能也得到了提高。在使用 AMD3-40 时，拉伸强度达到了 50 MPa。因此，我们得出结论，通过调整 AMD 结构在 PUE 中的浓度和设计，可以对 PUE 的自修复和机械性能进行定制，以满足特定应用的需求。
