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以稻秸为反应相,采用原位聚合反应在稻秸表面构筑聚磷酸铵(APP),再与高密度聚乙烯(HDPE)复合制成APP/稻秸/HDPE复合材料。通过添加偶联剂(异氰酸酯、钛酸酯偶联剂、γ-氨丙基三乙氧基硅烷)探讨偶联剂对APP/稻秸/HDPE复合材料性能的影响。极限氧指数测试表明,偶联剂有利于提高稻秸/HDPE复合材料的阻燃性能,当钛酸酯偶联剂的质量分数为3.0%时,复合材料的极限氧指数最大,为23.68%。力学性能测试表明,偶联剂改性对APP/稻秸/HDPE复合材料的拉伸强度和弯曲强度影响不大,但能显著增加复合材料的断裂伸长率,特别是钛酸酯偶联剂使APP/稻秸/HDPE复合材料的断裂伸长率和冲击强度得到改善。SEM分析显示,偶联剂的加入改善了APP、稻秸、HDPE之间的相容性,当偶联剂为钛酸酯偶联剂时,APP/稻秸/HDPE复合材料界面相容性最佳。
The APP-straw / HDPE composites were made by in-situ polymerization of ammonium polyphosphate (APP) on the surface of rice straw and then with high density polyethylene (HDPE). The effect of coupling agent on the properties of APP / rice straw / HDPE composites was investigated by adding coupling agent (isocyanate, titanate coupling agent, γ-aminopropyltriethoxysilane). The limit oxygen index test showed that the coupling agent is helpful to improve the flame retardancy of rice straw / HDPE composites. When the mass fraction of titanate coupling agent is 3.0%, the limit oxygen index of the composites is the highest, which is 23.68%. Mechanical properties tests show that the coupling agent modification has little effect on the tensile strength and flexural strength of APP / rice straw / HDPE composites, but can significantly increase the elongation at break of the composites, especially the titanate coupling agent The elongation at break and the impact strength of APP / straw / HDPE composites were improved. SEM analysis showed that the addition of coupling agent improved the compatibility between APP, rice straw and HDPE. When the coupling agent was titanate coupling agent, the interface compatibility of APP / rice straw / HDPE composite was the highest good.