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首页> 外文期刊>Journal of Applied Polymer Science >High-resolution thermogravimetry of polyphenylene sulfide film under four atmospheres
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High-resolution thermogravimetry of polyphenylene sulfide film under four atmospheres

机译：四种气氛下聚苯硫醚薄膜的高分辨率热重分析

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Thermal degradation of polyphenylene sulfide (PPS) film was investigated in air, nitrogen, helium, and argon with different physical and reactive characteristics from room temperature to 790degreesC by a high-resolution thermogravimetry (TG) at a variable heating rate in response to the changes in the sample's weight-loss rate. In nitrogen and argon, only a single-step degradation process of the PPS was observed, but in helium, a two-step degradation process of PPS was found. Notably, in air a four-step degradation process of the PPS, which was hardly ever revealed by a traditional TG, was found in this investigation. The initial thermal degradation temperature T-d and temperature at the first maximum weight-loss rate T-dm1 of the PPS increased in the following order: in helium < in nitrogen < in argon < in air. The first maximum weight-loss rate also increased with the variation of atmosphere in the order: nitrogen < air < argon < helium. The char yield at 700degreesC increased in the order: in air < in helium < in nitrogen < in argon. The activation energy of the major degradation process of PPS calculated based on the high-resolution TG data was very high, increasing in the order: in nitrogen < in argon < in helium < in air. The thermal decomposition parameters of the PPS determined by the high-resolution TG were systematically compared with those by traditional TG at a constant heating rate. (C) 2002 John Wiley Sons, Inc. [References: 22]
机译：通过高分辨率热重法（TG）在可变升温速率下响应于变化，在空气，氮气，氦气和氩气中，从室温到790摄氏度，研究了具有不同物理和反应特性的聚苯硫醚（PPS）薄膜的热降解样品的减肥率。在氮气和氩气中，仅观察到PPS的单步降解过程，而在氦气中，发现了PPS的两步降解过程。值得注意的是，在这项研究中发现了空气中PPS的四步降解过程，这是传统TG几乎没有揭示的。 PPS的初始热降解温度T-d和第一最大失重率T-dm1的温度按以下顺序增加：氦气<氮气<氩气<空气中。第一个最大减肥率也随着大气的变化而增加，依次为：氮<空气<氩<氦。 700℃时的炭产率按以下顺序增加：在空气中<在氦气中<在氮<氩气中。根据高分辨率TG数据计算得出的PPS主要降解过程的活化能非常高，依次增加：氮<氩中<氦中<空气中。系统地比较了高分辨率TG确定的PPS的热分解参数与传统TG在恒定加热速率下的热分解参数。 （C）2002 John Wiley Sons，Inc. [参考：22]

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