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利用共混的方法制备了聚对苯二甲酸乙二醇酯/氢氧化镁(PET/Mg(OH)_2)复合材料,全面考察了Mg(OH)_2用量对阻燃增强PET/Mg(OH)_2复合体系力学性能和阻燃性能的影响。极限氧指数(LOI)测试结果表明,Mg(OH)_2有效提高了PET/Mg(OH)_2复合材料的阻燃性能,且随着Mg(OH)_2用量的增加,复合材料的LOI逐渐增大,而熔滴数量逐渐减少;UL 94结果表明,复合材料的燃烧时间变短,燃烧温度降低,使UL 94等级提高到了V-0;力学测试结果表明,随着Mg(OH)_2含量的增加,PET/Mg(OH)_2复合材料的断裂强度和屈服强度呈现先增大后减小的趋势,而复合材料的断裂伸长率则先减小后增大;PET/Mg(OH)_2复合材料的冲击强度随着Mg(OH)_2用量的增加而减小,即复合材料的韧性逐渐降低。总之,Mg(OH)_2对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 blend of polyethylene terephthalate / magnesium hydroxide (PET / Mg (OH) 2) was prepared by blending method. The effect of Mg (OH) ) _2 composite system mechanical properties and flame retardant properties. The results of the limit oxygen index (LOI) test showed that Mg (OH) _2 effectively enhanced the flame retardancy of PET / Mg (OH) _2 composites. With the increase of Mg (OH) The results of UL 94 show that the burning time of composites is shortened and the combustion temperature is decreased, the UL 94 level is increased to V-0. The mechanical test results show that with the increase of Mg (OH) 2 content , The fracture strength and yield strength of PET / Mg (OH) _2 composites firstly increase and then decrease, while the elongation at break of PET / Mg (OH) 2 first decreases and then increases; The impact strength of the composites decreases with the increase of the amount of Mg (OH) 2, that is, the toughness of the composites decreases gradually. In short, Mg (OH) _2 has obvious promoting effect on the crystallization performance and flame retardancy, and has a good application prospect.