In order to improve the flame retardancy of glass fibers (GFs) reinforced polyamide 6 (PA6) composites and eliminate the “wicking effect,” the preparation and application of graphene oxide (GO) modified GFs were investigated in this work. Flame retardant PA6 was prepared by blending graphene oxide modified GFs reinforced PA6 and aluminum diethyl phosphonate. For the GFs reinforced PA6, the limiting oxygen index of the composite increased from 20.6% to 22.3%, and peak heat release rate decreased by 37.2% in cone calorimeter test via introducing graphene oxide onto the surface of GFs. Comparing PA6/GF30/ADP15 and PA6/GF‐GO30/ADP15, LOI of the later increased to 31.2%, the vertical burning test (UL‐94) reached V‐0, and the peak heat release rate decreased by 18.0%. The interface compatibility was greatly improved after the introduction of GO. The sheet structure of the GO on the GFs surface could block the combustible gas spillage and the flow of melt along the GFs, thus significantly attenuating the “wicking effect” and improving the flame retardancy of composites.

中文翻译：

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氧化石墨烯改性玻璃纤维的制备及其在阻燃聚酰胺6中的应用

为了提高玻璃纤维（GFs）增强的聚酰胺6（PA6）复合材料的阻燃性并消除“芯吸效应”，在这项工作中对氧化石墨烯（GO）改性的GFs的制备和应用进行了研究。阻燃剂PA6通过将氧化石墨烯改性的GFs增强的PA6和二乙基膦酸铝共混来制备。对于GFs增强的PA6，在锥形量热仪测试中，通过将石墨烯氧化物引入GFs表面，复合材料的极限氧指数从20.6％增加到22.3％，并且峰值放热率降低37.2％。与PA6 / GF30 / ADP15和PA6 / GF-GO30 / ADP15相比，后者的LOI增至31.2％，垂直燃烧试验（UL-94）达到V-0，峰值放热率降低了18.0％。引入GO后，接口兼容性大大提高。