Herein, epoxy resins for composite liquid oxygen (LOX) fuel tanks are modified with phosphorous flame retardant (DOPO) and brominated epoxy resin (EX48). With the incorporation of DOPO and EX48, the processing properties requirements for the hot-melt prepreg are contented with the significantly enhanced viscosity of the modified epoxy resin. At the same time, the tensile performance, flexural performance and fracture toughness of epoxy resin at room temperature and 90 K are improved with the introduction of DOPO and EX48. In addition, the epoxy resin of EP/P_7.7/Br₄₀ offers a highest limited oxygen index of 33.5% and a lowest LOX impact sensitivity of 5% with the eliminated LOX incompatible reactions including explosion and combustion. Consideration of the excellent cryogenic mechanical properties and LOX compatibility, combined with ideal viscosity for hot-melt prepreg preparation, the epoxy resin modified with DOPO and EX48 simultaneously is attractive as the polymer matrix for composite LOX fuel tanks.

在此，用于复合液氧（LOX）燃料箱的环氧树脂用磷阻燃剂（DOPO）和溴化环氧树脂（EX48）改性。通过掺入DOPO和EX48，热熔预浸料的加工性能要求满足了改性环氧树脂的显着提高的粘度要求。同时，通过引入DOPO和EX48可以改善室温和90 K时环氧树脂的拉伸性能，弯曲性能和断裂韧性。另外，EP / P _7.7 / Br ₄₀的环氧树脂提供了最高的极限氧指数33.5％和最低的LOX冲击敏感性5％，并消除了包括爆炸和燃烧在内的LOX不相容反应。考虑到优异的低温机械性能和LOX相容性，再加上用于热熔预浸料制备的理想粘度，同时用DOPO和EX48改性的环氧树脂作为复合LOX燃料箱的聚合物基体具有吸引力。