裂解气相色谱-质谱法研究聚亚苯基砜的热裂解机理

Study on the Pyrolysis Mechanism of Poly(phenylene sulfone) by Pyrolysis Gas Chromatography-Mass Spectroscopy

在热重分析测试结果的基础上,采用裂解气相色谱-质谱联用仪(Py GC-MS)分析了聚亚苯基砜(PPSU)在500~700℃范围内不同温度下裂解形成的产物种类及其相对含量。结果发现:在500℃下,PPSU的分子链发生了裂解,不过形成的主要产物是苯酚,而不是二氧化硫。随着裂解温度升高,裂解产物种类越来越多,主要有对联苯基苯醚、二氧化硫、二苯醚、苯和对苯基苯酚等,并且二氧化硫逐渐成为相对含量最高的产物。最后根据不同温度下形成的裂解产物的种类及其相对含量推测了PPSU产生热裂解的机理。

Based on the test results of TGA, the types and relative contents of the products formed by pyrolysis of poly（phenylene sulfone） （PPSU） at different temperatures from 500℃ to 700℃ was analyzed by pyrolysis gas chromatography-mass spectroscopy （PyGC-MS）. The results show that： the molecular chain of PPSU is cleaved at 500℃, but the main product is phenol, not sulfur dioxide. With the increase of pyrolysis temperature, the types of pyrolysis products become more and more, mainly are phenyl ether, sulfur dioxide, antithetical couplet two phenyl ether, benzene and p-phenylphenol, and sulfur dioxide has become the highest relative content of the product. Finally, according to the types and relative contents of the pyrolysis products formed at different temperatures, the mechanism of PPSU thermal cracking was speculated.