A new high performance stiff epoxy vitrimer based on siloxane equilibration has been fabricated in a simple way in which a polysiloxane oligomer containing aminopropyl side groups and catalytic potassium silanolate end groups was synthesized and used as a curing agent. The viscoelastic properties of the cured epoxy can be controlled by varying the concentration of potassium silanolate groups and the vitrimer possessing a complete stress relaxation behavior can be prepared, with relaxation times ranging from 376.8 s at 90 °C to 40.2 s at 170 °C. Due to the dynamic siloxane equilibration of polysiloxane catalyzed by potassium silanolate groups, this epoxy vitrimer exhibits excellent self-healing and recycling abilities. It can self-repair with a high healing efficiency, and be recycled at 130 °C within 40 min, retaining its original mechanical and thermal properties after at least four recycling cycles. Furthermore, such a material exhibits simultaneously a high service temperature (a glass transition temperature of 83 °C and an initial degradation temperature of 358 °C) and a strong (a stress at break of 46.6 MPa) and stiff (Young's modulus of 2.2 GPa) nature.

中文翻译：

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通过硅氧烷平衡可 轻松获得具有出色机械性能的硬质环氧微晶†

已经以简单的方法制备了一种新的基于硅氧烷平衡的高性能硬质环氧玻璃体，其中合成了含有氨基丙基侧基和催化硅醇钾端基的聚硅氧烷低聚物，并将其用作固化剂。可以通过改变硅烷醇钾基团的浓度来控制固化后的环氧树脂的粘弹性质，可以制备出具有完全应力松弛行为的微晶硅，其松弛时间范围从90°C的376.8 s到170°C的40.2 s。由于硅烷醇钾基团催化的聚硅氧烷的动态硅氧烷平衡，该环氧微晶陶瓷表现出出色的自修复和回收能力。它可以自我修复，具有很高的治愈效率，并且可以在40分钟内在130°C的温度下回收，至少四个回收周期后，仍保留其原始的机械和热性能。此外，这种材料同时具有较高的使用温度（玻璃化转变温度为83°C和初始降解温度为358°C）和强壮的（断裂应力为46.6 MPa）和坚硬的（杨氏模量为2.2 GPa） ） 自然。