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首页> 外文期刊>Journal of Applied Polymer Science >Kinetics of thermal decomposition of unsaturated polyester resins with reduced flammability
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Kinetics of thermal decomposition of unsaturated polyester resins with reduced flammability

机译：易燃性降低的不饱和聚酯树脂的热分解动力学

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In this article, the kinetics of thermal decomposition of unsaturated maleic-phthalic polyester resins, flame-retarded with zinc hydroxystannate, was studied by thermogravimetric analysis at different heating rates. At the first stage, it was found, on the basis of isoconversional analysis by the methods of Friedman and of Ozawa-FlynnWall, that the value of the (apparent) activation energy (E) characteristically changes in three steps during the degradation. Further kinetic studies using nonlinear regression methods revealed the best fits for both pristine and stabilized resins. It was observed that the course of E versus the degree of conversion (alpha) during degradation of zinc hydroxystannate-containing resins (alpha > 0.8) was characterized by higher values of E-this phenomenon can be explained in terms of the flame-retardation action of zinc hydroxystannate, which is believed to operate primarily in the condensed phase. At the next stage, kinetic analysis by the nonregression method was performed to find the kinetic model [f(alpha) function] of the decomposition process; hence, for pristine resin, the best fit was found for the Avrami-Yerofeeyev model (nuclei growth), and for stabilized samples, the nth-order function with catalysis proved to be the best approximation. The obtained kinetic parameters in the form of E, the preexponential factor A, and the model function f(alpha) allow a prediction of the polyester resin's thermal behavior in an extrapolated range of degree of conversion, time, and temperature. (C) 2003 Wiley Periodicals, Inc. [References: 20]
机译：在本文中，通过热重分析在不同的加热速率下研究了用羟基锡酸锌阻燃的不饱和马来酸-邻苯二甲酸聚酯树脂的热分解动力学。在第一阶段，基于弗里德曼（Friedman）和小泽·弗林瓦（Ozawa-FlynnWall）的方法进行的等转换分析发现，在降解过程中，（表观）活化能（E）的值在三个步骤中发生了特征性变化。使用非线性回归方法进行的进一步动力学研究表明，原始树脂和稳定化树脂均最合适。观察到，在含羟基锡酸锌的树脂降解过程中，E的变化与转化率（α）的关系（α> 0.8）的特征在于较高的E值。这种现象可以用阻燃作用来解释。羟基锡酸锌，据信主要在冷凝相中运行。在下一阶段，通过非回归方法进行了动力学分析，以找到分解过程的动力学模型[f（α）函数]。因此，对于原始树脂，Avrami-Yerofeeyev模型（原子核生长）找到了最佳拟合，对于稳定的样品，具有催化作用的n阶函数被证明是最佳近似。以E，指数前因子A和模型函数f（α）形式获得的动力学参数，可以在转化率，时间和温度的推断范围内预测聚酯树脂的热行为。 （C）2003 Wiley Periodicals，Inc. [参考：20]

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