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聚对苯二甲酸乙二醇酯(PET)因其出色的物理化学性能在纤维、塑料和薄膜等领域得到广泛应用,但PET难以降解给环境带来了巨大压力。采用乙二醇醇解法对废弃PET瓶片进行降解,并将该醇解产物及反应性阻燃剂2-羧乙基苯基次磷酸酯通过缩聚反应制备分子内磷系阻燃共聚酯(RF-PET),并对其结构性能进行表征。结果表明:醇解产物经提纯主要为对苯二甲酸乙二醇酯(BHET)。与PET相比,RF-PET的T_g、T_m下降,结晶度减小。RF-PET有很好的阻燃性能,当磷含量为10mg/g时,极限氧指数值达33.0%。
Due to its excellent physical and chemical properties, polyethylene terephthalate (PET) is widely used in the fields of fiber, plastic and film, but PET is hard to be degraded and exerts great pressure on the environment. The ethylene glycol alcoholysis method was used to degrade the waste PET flake, and the alcoholysis product and the reactive flame retardant 2-carboxyethylphenyl hypophosphite were used to prepare intramolecular phosphorus flame retardant copolyester RF-PET) and characterize its structural properties. The results show that the alcoholysis product is mainly ethylene terephthalate (BHET). Compared with PET, RF-PET T_g, T_m decreased, the degree of crystallinity decreases. RF-PET has a good flame retardant properties, when the phosphorus content of 10mg / g, the limit oxygen index value of 33.0%.