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利用双螺杆挤出机制备了聚对苯二甲酸乙二酯/三氧化二锑(PET/Sb_2O_3)复合材料,并通过差示扫描量热仪、热重分析仪、极限氧指数测试仪和水平垂直测试仪对PET/Sb_2O_3复合材料结晶性能、热性能和阻燃性能进行了表征。结果表明:Sb_2O_3具有明显的异相成核作用,促进了PET的结晶,使PET/Sb_2O_3复合材料的结晶温度、熔融温度及相对结晶度明显增加。断面形貌观察结果显示,少量的Sb_2O_3能够均匀地分散在PET基体中,Sb_2O_3较多时,分散性变差,出现白色颗粒状团聚体。阻燃测试表明,复合材料的极限氧指数从22.4%提高到了31.6%,UL 94垂直燃烧测试达到了V-0级,且有效地抑制熔滴滴落。热失重结果表明,热分解温度随Sb_2O_3用量的增加而逐渐提升,而复合材料的热分解速率则随着Sb_2O_3用量的增加而逐渐下降,且Sb_2O_3增加了复合材料的成炭性能。总之,Sb_2O_3对PET结晶性能和阻燃性能均具有明显的促进作用,具有较好的应用前景。
The polyethylene terephthalate / antimony trioxide (PET / Sb_2O_3) composites were prepared by twin screw extruder and characterized by differential scanning calorimetry, thermogravimetric analyzer, limit oxygen index tester and level The vertical tester was used to characterize the crystallization, thermal and flame retardancy of PET / Sb_2O_3 composites. The results show that Sb 2 O 3 has obvious heterogeneous nucleation and promotes the crystallization of PET. The crystallization temperature, melting temperature and relative crystallinity of PET / Sb 2 O 3 composites increase obviously. The observation of the cross section morphology shows that a small amount of Sb 2 O 3 can be uniformly dispersed in the PET matrix. When Sb 2 O 3 is more, the dispersibility becomes worse and white granular aggregates appear. Flame-retardant tests showed that the limit oxygen index of the composites increased from 22.4% to 31.6%, UL 94 vertical combustion test reached V-0 level, and effectively inhibit droplet dripping. Thermogravimetric analysis shows that the thermal decomposition temperature increases with the increase of Sb 2 O 3 dosage, while the thermal decomposition rate of the composite decreases with the increase of Sb 2 O 3 dosage, and Sb 2 O 3 increases the carbon formation of the composites. In short, Sb 2 O 3 on the crystallization of PET and flame retardant properties have obvious role in promoting, has a good prospect.