Abstract The aim of this study is to improve the interaction between ammonium polyphosphate (APP) and epoxy resin (EP) matrix. The modified ammonium polyphosphate (MAPP) with hydrophobic property was prepared by the cationic latex via electrostatic interaction. The results showed that the hydrophobicity and thermal stability of MAPP were improved over APP. The increased hydrophobicity of MAPP facilitated its mixing efficiency with EP matrix and the mechanic property results of EP/MAPP composites supported an enhancement of interfacial interaction between MAPP and EP matrix. For example, the impact strength of EP/MAPP13.5 (13.5 wt part of APP per hundred EP matrix) was 15.58 kJ m−2, compared with 12.47 kJ m−2 of EP/APP13.5, while the tensile strength increased from 51.06 MPa of EP/APP13.5 to 61.76 MPa of EP/MAPP13.5. Such interfacial interaction improvement would assist the stress transfer and adsorption of impact energy. In addition, the MAPP showed little impact on the flame resistance properties of APP. For example, both EP/APP13.5 and EP/MAPP13.5 composites had V-0 grade in the vertical burning tests.

中文翻译：

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通过阳离子胶乳疏水改性增强聚磷酸铵与环氧树脂基体之间的相互作用

摘要 本研究旨在改善聚磷酸铵（APP）与环氧树脂（EP）基体之间的相互作用。阳离子胶乳通过静电作用制备了具有疏水性的改性聚磷酸铵(MAPP)。结果表明，MAPP的疏水性和热稳定性较APP有所提高。MAPP 增加的疏水性促进了其与 EP 基体的混合效率，EP/MAPP 复合材料的力学性能结果支持增强了 MAPP 和 EP 基体之间的界面相互作用。例如，EP/MAPP13.5 的冲击强度（13.5 wt 份 APP/100 EP 基质）为 15.58 kJ m-2，而 EP/APP13.5 的冲击强度为 12.47 kJ m-2，而拉伸强度从EP/APP13.5 的 51.06 MPa 至 EP/MAPP13.5 的 61.76 MPa。这种界面相互作用的改进将有助于冲击能量的应力传递和吸收。此外，MAPP 对 APP 的阻燃性能几乎没有影响。例如，EP/APP13.5 和 EP/MAPP13.5 复合材料在垂直燃烧测试中都具有 V-0 级。