裂解气相色谱-质谱法研究芳香族聚酯类纤维热分解

采用裂解气相色谱质谱法研究了600℃时聚对苯二甲酸丁二酯纤维(PBT)、聚对苯二甲酸丙二酯纤维(PTT)和聚对苯二甲酸乙二酯纤维(PET)的热裂解反应,分别鉴别到22种、25种和25种主要裂解产物。PBT的特征性裂解产物是苯甲酸丁烯酯、苯甲酸丁酯、1,4-苯二甲酸-3-丁烯酯、1,4-苯二甲酸-双-3-丁烯酯和二苯甲酸-1,4-丁二醇酯;PTT的特征性裂解产物为苯甲酸丙烯酯、苯甲酸丙酯、对苯二甲酸单丙烯酯、1,4-苯二甲酸-双-2-丙烯基酯、二苯甲酸-1,3-丙二醇酯;PET的特征性裂解产物为苯甲酸乙烯酯、苯甲酸乙酯、苯二甲酸双乙烯酯、二苯甲酸-1,2-乙二醇酯。

Thermal Decomposition Aromatie Polyster by Pyrolysis Gas Chromatography-mass Spectrometry

Pyrolysis of three kinds of aromatic polyester fiber including polybutylene terephthalate,polytrimethylene terephthalate and polyethylene terephthalate had been investigated using pyrolysis gas chromatography-mass spectroscopy.Their compositions of pyrolysates had been analyzed.At 600 ℃,twenty-two,twenty-five,twenty-five specific pyrolysates had been identified for PBT,PTT and PET.The characteristic pyrolysates for PBT fiber were butenyl benzoate,butyl benzoate,3-butenyl-1,4-terephthalate,bis-3-butenyl-1,4-terephthalate,1,4-butanediol dibenzoate.The characteristic pyrolysates for PTT fiber were propenyl benzoate,propyl benzoate,monopropenyl p-phthalate,diallyl terephthalate,1,3-propanediol dibenzoate.The characteristic pyrolysates for PET fiber were ethylene benzoate,ethylbenzoate,diethylene terephthalate,dibenzoate-1,2-ethanediol.