Epoxy resin (EP) is one kind of thermosetting polymer with prominent physical and chemical properties and has been extensively used in various aspects of the world. Nevertheless, its intrinsic inflammability impedes its application in some occasions. Therefore, the flame retardant treatment of EP is of much significance. In this work, two novel phosphorus-nitrogen type flame retardants N-DOPO and PPDAT based on triazole were prepared. The distribution of molecular weight of the as-prepared polymeric flame retardant PPDAT was characterized by gel permeation chromatography (GPC) analysis. The number-average molecular weight (M_n), the weight-average molecular weight (M_w) and the distribution index (D) value of PPDAT were 8849, 9324 and 1.05, respectively. The results of flame retardant tests evinced that after introducing 7.5 wt% N-DOPO, a V-0 rating in the UL-94 test and a desirable limiting oxygen index (LOI) value of 33.5% were achieved. With 7.5 wt% PPDAT added, this composite only reached V-1 level with a LOI value of merely 30%, indicating that in contrast with PPDAT, N-DOPO presents better flame retardant efficiency for epoxy resin. Through the analysis of the products in combustion process, it was determined that EP/PPDAT composite could catalyze the formation process of dense continuous carbon layers, with efficient flame retardant effect in the condensed phase. This work provided the strategy of introducing triazole units into flame retardants and would help sprout a new series of flame retardants.

环氧树脂（EP）是一种具有突出物理化学性能的热固性聚合物，在世界各个方面都有着广泛的应用。然而，其固有的易燃性阻碍了其在某些场合的应用。因此，EP的阻燃处理意义重大。在这项工作中，制备了两种基于三唑的新型磷氮型阻燃剂 N-DOPO 和 PPDAT。通过凝胶渗透色谱 (GPC) 分析表征所制备的聚合物阻燃剂 PPDAT 的分子量分布。数均分子量（M _n）、重均分子量（M _w）和分布指数（D) PPDAT 的值分别为 8849、9324 和 1.05。阻燃测试结果表明，在引入7.5 wt%的N-DOPO后，达到了UL-94测试中的V-0等级和33.5%的理想极限氧指数（LOI）值。添加 7.5 wt% PPDAT 后，该复合材料仅达到 V-1 级，LOI 值仅为 30%，表明与 PPDAT 相比，N-DOPO 对环氧树脂具有更好的阻燃效率。通过对燃烧过程中产物的分析，确定了EP/PPDAT复合材料能够催化致密连续碳层的形成过程，在凝聚相中具有高效的阻燃效果。这项工作提供了将三唑单元引入阻燃剂的策略，将有助于催生一系列新的阻燃剂。