无定形共聚酯热分解的裂解-气相色谱-质谱分析

应用裂解-气相色谱-质谱(PY-GC-MS)联用技术研究了新型的无定形共聚酯PETG的热分解性能。结果表明:不同裂解温度下,产物组成差别很大。600℃裂解时,在总离子流图(TIC)上各特征裂解产物的存在最为明显,可以为PETG共聚酯的结构鉴定提供丰富的结构信息。通过热裂解,使PETG产生特征产物、相应的缩合物和环化产物等裂解产物,并经色谱分离、质谱鉴定,可准确判断PETG共聚酯的结构组成。另外根据热分解产物的组成和温度依赖性,讨论了PETG共聚酯的热分解机理。

Study on Pyrolysis of Newly Developed Copolyester PETG by Pyrolysis-gas Chromatography-mass Spectroscopy

Poly (ethylene glycol-co-cyclohexane 1,4-dim ethanolterephthalate)(PETG )w as a new ly developed copolyester. The thermal degradation of PETG was investigated by pyrolysis-gas chromatography/mass spectroscopy (PY-GC-MS). The results showed that the pyrolysis products were very different at different pyrolysis temperature. At 600℃, the pyrolysis products of PETG were characteristic of PETG composition, which was used to determine the polymer chemical structure. On the basis of the pyrolyzate profile and the dependence of pyrolyzate yields on pyrolysis temperature, the thermal degradation mechanism of PETG was proposed.