近年来，磷杂菲类阻燃剂因反应活性高、相容性好而被广泛应用于阻燃环氧树脂（EP）。然而，它具有阻燃效率不高、对EP的残炭生成促进作用不显著、对阻燃效果的提升有限等缺点。而解决这些问题的有效途径是将9,10-二氢-9-氧杂-10-磷杂菲-10-硫化物 (DOPS) 和磷腈进行复合，发挥二者的协同效应，构建新型高效阻燃体系。本项目拟采用分子设计的方法，制备几种新型结构的协同阻燃剂，并将其用于阻燃EP。首先，研究分子内桥键变化对材料协同阻燃行为的影响，揭示不同桥键对材料降解路线及协同阻燃机理的影响规律；其次，研究分子内基团比例变化对材料协同阻燃行为的影响，阐明DOPS/磷腈双基化合物在EP中的量效关系；最后，研究不同引入方式对材料协同阻燃行为的影响，明确DOPS和磷腈双基协效的作用机理。本项目将有望扩展DOPS/磷腈双基化合物在阻燃领域的应用范围，为今后设计合成新型高效双基化合物阻燃剂提供借鉴。

In recent years, phosphaphenanthrene and its derivatives have been widely used in flame retardant epoxy resin(EP) because of their high reactivity and good compatibility in EP. However, its flame retardant efficiency is not high, the formation promotion of residue char of EP is not remarkable, and the enhancement of flame retardant effect is limited. One of the effective ways to solve these problems is combined between phosphaphenanthrene and phosphazene with their synergistic effect to build a new type of high efficiency flame retardant system. This project aims to prepare several novel synergistic flame retardants based on molecular design method and apply them to the flame retardant EP. First, the effects of bridge bond variety on synergistic flame retardant behavior are conducted to reveal the influence rules of different bridge bonds on the material degradation route and synergistic flame retardant mechanism; secondly, the effects of group ratio change on synergistic flame retardant behaviour are executed to clarify the dose-response relationship of the compound based on DOPS and phosphazene groups in EP; Finally, the effects of different introducing methods on synergistic flame retardant behavior are studied to elaborate the synergistic mechanism of DOPS and phosphazene double functional groups. This project is expected to expand the application range of DOPS/phosphazene double functional groups compound in the field of flame retardancy, so as to provide references for the design and synthesis of novel high efficiency double functional groups compound flame retardants in the future.