With the purpose to obtain an eco-friendly flame retardant for epoxy resin, a facile method for the synthesis of a bio-based epoxy monomer containing DOPO units (DGEBDB) from lignin-derived vanillin and guaiacol, was presented in this work. During the synthesis process, guaiacol acted as both reactant and solvent. And it could be recycled in situ and re-used as the fresh one. In order to evaluate the flame retardancy of DGEBDB, it was mixed with diglycidyl ether of bisphenol A (DGEBA) and cured with 4,4-diaminodiphenylmethane (DDM). Results showed that, DGEBDB demonstrated a good compatibility with DGEBA, and the mechanical properties of cured resins were obviously improved with the addition of DGEBDB. As expected, the limiting oxygen index (LOI) of cured resin reached 30.2% with the content of phosphorus only 0.67 wt%, in which the weight ratio between DGEBDB and DGEBA was 1:9 (B1D9/DDM). When the weight ratio of DGEBDB to DGEBA was further increased to 2:8 for the B2D8/DDM system, the UL-94 V-0 grade was achieved. Meanwhile, the mechanism of DGEBDB in improving the flame retardancy of cured resin was discussed and revealed. This easily available and eco-friendly DGEBDB was proved to be a highly efficient reactive flame retardant for epoxy resin.

为了获得用于环氧树脂的环保阻燃剂，在这项工作中提出了一种从木质素衍生的香兰素和愈创木酚合成包含DOPO单元的生物基环氧单体（DGEBDB）的简便方法。在合成过程中，愈创木酚既充当反应物又充当溶剂。它可以就地回收再利用，作为新鲜的。为了评估DGEBDB的阻燃性，将其与双酚A的二缩水甘油醚（DGEBA）混合，并与4,4-二氨基二苯甲烷（DDM）固化。结果表明，DGEBDB与DGEBA具有良好的相容性，加入DGEBDB可以明显改善固化树脂的力学性能。正如预期的那样，固化树脂的极限氧指数（LOI）达到了30.2％，磷的含量仅为0.67 wt％，其中DGEBDB与DGEBA的重量比为1：9（B1D9 / DDM）。对于B2D8 / DDM系统，当DGEBDB与DGEBA的重量比进一步提高到2：8时，就达到了UL-94 V-0级。同时，探讨并揭示了DGEBDB改善固化树脂阻燃性的机理。事实证明，这种易用且环保的DGEBDB是高效的环氧树脂活性阻燃剂。