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首页> 外文期刊>Journal of Applied Polymer Science >Isothermal gravimetric analysis of poly(trimethylene terephthalate)
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Isothermal gravimetric analysis of poly(trimethylene terephthalate)

机译：聚对苯二甲酸丙二醇酯的等温重量分析

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Poly(trimethylene terephthalate) was investigated by isothermal thermo-gravimetry in nitrogen at six temperatures, including 304, 309, 314, 319, 324, and 336degreesC. The isothermal data have been analyzed using both a peak maximum technique and an iso-conversional procedure. Both techniques gave apparent activation energies of 201 and 192 kJ mol(-1), respectively, for the isothermal degradation of poly(trimethylene terephthalate) in nitrogen. The decomposition reaction order is calculated to be 1.0. The natural logarithms of the frequency factor based on the peak maximum and the iso-conversional techniques are 36 and 34 min(-1), respectively, for poly(trimethylene terephthalate) decomposed isothermally in nitrogen. These isothermal kinetic parameters are in good agreement with those derived by the Kissinger technique on the basis of the dynamic thermogravimetric data reported elsewhere (209 kJ mol(-1), 1.0 and 37 min(-1)). The isothermal decomposition of poly(trimethylene terephthalate) in nitrogen undergoes two processes, a relative fast degradation process in the initial period and a subsequent one with a slower weight-loss rate. The former process may be due to the removal of ester groups, trimethylene groups, and aromatic hydrogen atoms from the chain of poly(trimethylene terethphalate). The latter one may be ascribed to the further pyrolysis of the carbonaceous char. (C) 2002 Wiley Periodicals, Inc. [References: 30]
机译：通过等温热重法在氮气中于304、309、314、319、324和336°C等六个温度下研究了聚对苯二甲酸丙二醇酯。等温数据已使用最大峰技术和等温转换程序进行了分析。两种技术在氮气中等温降解聚对苯二甲酸亚丙基三酯时，表观活化能分别为201和192 kJ mol（-1）。分解反应级数经计算为1.0。基于峰值最大值和等转换技术的频率因子的自然对数分别为在氮气中等温分解的聚对苯二甲酸丙二醇酯的36和34 min（-1）。这些等温动力学参数与基辛格技术基于其他地方报道的动态热重数据（209 kJ mol（-1），1.0和37 min（-1））得出的参数吻合得很好。聚对苯二甲酸丙二醇酯在氮气中的等温分解经历两个过程，在初始阶段的降解速度相对较高，而随后的失重速率较慢。前一种方法可能是由于从聚对苯二甲酸三亚甲基酯的链中除去了酯基，三亚甲基和芳香族氢原子。后者可能归因于碳质焦炭的进一步热解。 （C）2002 Wiley Periodicals，Inc. [参考：30]

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