SW280玻璃布/苯并噁嗪热熔法预浸料的性能研究

PROPERTIES OF SW280 FABRIC/BENZOXAZINE PREPREGS PREPARED BY HOT MELT IMPREGNATION

本文采用热熔法制备SW280玻璃布/苯并噁嗪预浸料,并对苯并噁嗪树脂工艺性、热失重性能,及复合材料动态热机械性能、高温力学性能保持率、阻燃性能等进行工艺试验和性能评价。结果表明,苯并噁嗪树脂软化点在41~42℃,最低黏度点为1835m Pa·s,满足热熔法预浸料的制备要求;氮气氛围下起始分解温度280℃左右,800℃时残碳率可达61.3%。SW280玻璃布/苯并噁嗪复合材料力学性能优异,界面粘接良好,玻璃化转变温度为200℃,其200℃高温下的压缩强度、弯曲强度、弯曲模量和层剪强度保持率分别为90.6%、59.4%、83.2%和62.7%。SW280玻璃布/苯并噁嗪复合材料阻燃性能优异,无焰和有焰模式下最大烟密度均为0,氧指数〉58%,燃烧等级为V-1。

Glass fabric-reinforced benzoxazine prepregs were prepared by hot melt impregnation. The process and thermogravimetry of the benzoxazine resin were studied. And the dynamic thermomechanic analysis,mechanical retaining at high temperature and flame retardant properties of the prepregs were also investigated. The softening point of the benzoxazine resin was 41 ~ 42℃ and the lowest viscosity was 1835 m Pa·s,which were suitable for the preparation of prepregs. In nitrogen atmosphere,the initial degradation temperature of benzoxazine resin was about280℃,and the char yield was about 61. 3% at 800℃. The mechanical and interface properties of the SW280 fabric/benzoxazine prepregs were excellent. The Tg of the composite was about 200℃. The retention ratios of the compression strength,flexural strength,flexural modulus,and interlaminar shear strength at 200℃ were 90. 6%,59. 4%,83. 2%,and 62. 7%,respectively. The flame retardancy of the composites was excellent. The maximal smoke density was 0. The oxygen index was 〉58%. The vertical burning level was V-1.