Thermosets of the diglycidyl ether of bisphenol A (DGEBA) are normally brittle owing to its rigid structure. To address this problem, a bioinspired strategy to form sacrificial bonds in a curing system, which may enhance the flexibility of epoxy thermosets and maintain a favorable strength simultaneously has been proposed. A tung (Aleurites montana L.) oil diglyceride based-acid (TODGA) that may construct sacrificial bonds with the epoxy matrix in the form of π-π interactions was prepared, and was added into a DGEBA / polyetheramine curing system at varying ratios. TODGA can greatly improve the flexibility and toughness of epoxy thermosets. At the addition of 7.5 wt%, the elongation at break, toughness, and impact strength are improved from 5.9 % to 86.6 %, from 2.1 to 19.0 MJ m⁻³, and from 4.3 to 5.9 kJ·m⁻² respectively, while the tensile strength is maintained at 34.8 MPa. In comparison, the toughening effect of TODGA outperforms that of commercial epoxidized soybean (Glycine max (L.) Merr.) oil. Although TODGA is a flexible modifier, it does not significantly decrease glass transition temperature and thermal stability. These results demonstrate that fabricating sacrificial bonds is a practical way to toughen epoxy thermosets, and TODGA can be potentially utilized as a commercial toughening agent.

双酚 A 的二缩水甘油醚 (DGEBA) 的热固性材料由于其刚性结构通常很脆。为了解决这个问题，提出了一种在固化系统中形成牺牲键的仿生策略，这可以提高环氧树脂热固性材料的柔韧性，同时保持良好的强度。制备了桐油 (Aleurites montana L.) 油甘油二酯基酸 (TODGA)，其可以以 π-π 相互作用的形式与环氧基体构建牺牲键，并以不同的比例添加到 DGEBA/聚醚胺固化体系中。TODGA 可以大大提高环氧树脂热固性材料的柔韧性和韧性。添加 7.5 wt% 后，断裂伸长率、韧性和冲击强度从 5.9 % 提高到 86.6 %，从 2.1 到 19.0 MJ m ^-3，从 4.3 到 5.9 kJ·m^-2分别，而拉伸强度保持在 34.8 MPa。相比之下，TODGA 的增韧效果优于商业环氧化大豆 (Glycine max (L.) Merr.) 油。尽管 TODGA 是一种柔性改性剂，但它不会显着降低玻璃化转变温度和热稳定性。这些结果表明，制造牺牲键是一种增韧环氧树脂热固性材料的实用方法，并且 TODGA 可以潜在地用作商业增韧剂。