Developing epoxy resins with superior toughness, flame retardant and hydrophobic as well as dielectric properties remains a huge challenge. Herein, an epoxy additive (ETP) was prepared by grafting phosphorus-containing molecules into the skeleton of silicone resin through silicon hydrogen addition reaction. Through such a design, the obtained ETP imparted Bisphenol A epoxy resin (DGEBA) with excellent flexibility, fire safety, hydrophobicity and dielectrical property. When only 6 wt% of ETP was introduced into the DGEBA system, the resulting product (ETP-6) passed the V-0 level in the UL-94 test with a high limiting oxygen index of 29.8 %, which could be ascribed to the presence of phosphorus and silicon element. Meanwhile, compared with neat DGEBA, the peak heat releases and smoke emissions of ETP-6 were reduced by 32.7 % and 37.8 % during the combustion. Additionally, ETP also imparted the cured product with excellent hydrophobic and dielectric properties, as well as superior toughness (114.5 % increase in impact strength) due to its “rigid and flexible” silicone skeleton and good dispersion. This work opens up a new strategy for developing high-performance and multifunctional epoxy resin additives with potential versatile applications.

开发具有优异韧性、阻燃性和疏水性以及介电性能的环氧树脂仍然是一个巨大的挑战。在此，通过硅氢加成反应将含磷分子接枝到有机硅树脂的骨架中制备环氧添加剂（ETP）。通过这样的设计，获得的ETP赋予了双酚A环氧树脂（DGEBA）优异的柔韧性、防火性、疏水性和介电性能。当仅将 6 wt% 的 ETP 引入 DGEBA 系统时，所得产品 (ETP-6) 通过了 UL-94 测试中的 V-0 级，极限氧指数高达 29.8%，这可归因于磷和硅元素的存在。同时，与纯DGEBA相比，ETP-6的放热峰​​值和烟气排放量分别降低了32.7%和37%。8 % 在燃烧过程中。此外，ETP 还赋予固化产品优异的疏水性和介电性能，以及由于其“刚柔并济”的有机硅骨架和良好的分散性而具有优异的韧性（冲击强度提高 114.5%）。这项工作开辟了开发具有潜在多功能应用的高性能和多功能环氧树脂添加剂的新策略。