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将二乙基次膦酸铝(Al Pi)引入到聚对苯二甲酸乙二醇酯(PET)中,采用垂直燃烧和氧指数等检测手段对PET复合材料的阻燃性能进行了研究,并运用热重分析仪(TG)和Flynn-Wall-Ozawa法计算了热分解活化能,进一步对热降解行为进行了深入探讨。结果表明:Al Pi用量为15%时,PET复合材料可达到UL 94V-0级,氧指数从21.2%逐渐提高到34.8%,阻燃效果较好;随着Al Pi用量的增加,改性PET材料的起始热分解温度逐渐降低,但其残炭率逐渐提高,同时当降解率(α)在0.5~0.7之间时,PET/Al Pi的降解活化能高于PET。表明Al Pi可促进PET复合材料在后期降解过程中形成更多炭层,起到隔热和隔氧的作用,有效地提高材料的阻燃性。
The flame retardant properties of PET composites were investigated by introducing Alp1 into polyethylene terephthalate (PET) by means of vertical combustion and oxygen index Thermal decomposition energy (TG) and Flynn-Wall-Ozawa method were used to calculate the activation energy of pyrolysis. The thermal degradation behavior was further studied. The results showed that when the content of Al Pi was 15%, the composite of PET reached UL 94V-0, the oxygen index increased gradually from 21.2% to 34.8%, and the flame retardant effect was better. With the increase of Al Pi content, The initial thermal decomposition temperature of the material gradually decreased, but the carbon residue rate gradually increased. Meanwhile, the degradation activation energy of PET / Al Pi was higher than that of PET when the degradation rate (α) was between 0.5 and 0.7. Al Pi can promote PET composites to form more carbon layers in the post-degradation process, which play the role of thermal insulation and oxygen barrier, and effectively improve the flame retardancy of the material.