Glass fiber (GF) can be deemed as a double-edged sword, which improves the strength of polymers but impairs the flame retardant efficiency and toughness. Herein, a novel phosphorus-containing polymeric compatibilizer (PPC) with multiple anhydride reaction sites was synthesized from radical copolymerization. PPC was directly compounded with 3-aminopropyltriethoxysilane modified GF, polyamide 6 (PA6) to prepare fire retarded glass fiber reinforced polyamide 6 (GFPA6) containing aluminium diethlyphosphinate. The multiple anhydride groups on PPC chain can react simultaneously with the amino groups on modified GF and the terminal amino groups on PA6 chain during processing. The modified GF and PA6 matrix are linked in this way, thereby enhancing the interface adhesion between GF and PA6 matrix. The addition of PPC can effectively heighten the tensile, flexural and Izod notched impact strength of GFPA6 composites. When GFPA6 burns, the addition of PPC leads to more continuous and dense carbonaceous char on GF surface, which weakens the “wick effect” and improves the flame retardant efficiency. This work also opens the door for new generations of inorganic reinforced polyamide, polyester and polyurethane.

玻璃纤维（GF）可以看作是一把双刃剑，它可以提高聚合物的强度，但会损害阻燃效率和韧性。本文中，通过自由基共聚合成了具有多个酸酐反应位点的新型含磷聚合物相容剂（PPC）。将PPC直接与3-氨基丙基三乙氧基硅烷改性的GF，聚酰胺6（PA6）混合，以制备含有二乙次膦酸铝的阻燃玻璃纤维增​​强聚酰胺6（GFPA6）。在加工过程中，PPC链上的多个酸酐基团可与修饰的GF上的氨基和PA6链上的末端氨基同时反应。改性的GF和PA6基质以这种方式连接，从而增强了GF和PA6基质之间的界面粘附。加入PPC可以有效提高拉伸强度，GFPA6复合材料的弯曲和悬臂梁缺口冲击强度。当GFPA6燃烧时，添加PPC会在GF表面产生更连续，更致密的碳质炭，从而减弱“芯吸效应”并提高阻燃效率。这项工作也为新一代的无机增强聚酰胺，聚酯和聚氨酯打开了大门。