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首页> 外文期刊>Journal of Applied Polymer Science >Kinetics of Thermal Degradation Studies of Some New Terpolymers Derived from 2,4-Dihydroxypropiophenone,Oxamide, and Formaldehyde
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Kinetics of Thermal Degradation Studies of Some New Terpolymers Derived from 2,4-Dihydroxypropiophenone,Oxamide, and Formaldehyde

机译：2,4-二羟基苯乙酮，乙酰胺和甲醛衍生的一些新三元共聚物的热降解动力学

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摘要

The terpolymers (2,4-DHPOF) have been synthesized by the condensation of 2,4-dihydroxypropiophenone with oxamide and formaldehyde in the presence of 2M HCl as catalyst with varying proportions of reactants. Terpolymer composition has been determined on the basis of their elemental analysis. The terpolymer has been characterized by UV-visible, IR, and 1H NMR spectra. The thermal decomposition behavior of some new terpolymers was studied using thermogravimetric analysis in air atmosphere at heating rate of 10C/min. Thermal decomposition curves are discussed with careful attention to minute details. The Freeman– Carroll and Sharp–Wentworth methods have been used to calculate activation energy and thermal stability.Thermal activation energy (Ea) calculated with the help of these methods are in agreement with each other. Thermodynamic parameters such as free energy change (DF), entropy change (DS), apparent entropy change (S*), and frequency factor (z) are also determined on the basis of the TG curves and by using data of the Freeman–Carroll method. The Freidman method evaluated the variation in the apparent activation energy changes by isoconversional (model-free) kinetic methods.
机译：三元共聚物（2,4-DHPOF）是在2M HCl作为催化剂，反应物比例不同的情况下，通过2,4-二羟基苯乙酮与乙酰胺和甲醛的缩合反应合成的。三元共聚物的组成已根据其元素分析确定。三元共聚物的特征在于紫外可见光谱，红外光谱和1H NMR光谱。在空气中以10C / min的升温速率进行热重分析，研究了一些新型三元共聚物的热分解行为。讨论热分解曲线时要特别注意细节。 Freeman–Carroll和Sharp–Wentworth方法已用于计算活化能和热稳定性。借助这些方法计算出的热活化能（Ea）彼此一致。热力学参数，例如自由能变化（DF），熵变化（DS），表观熵变化（S *）和频率因数（z），也基于TG曲线和Freeman–Carroll数据确定方法。 Freidman方法通过等转化（无模型）动力学方法评估了表观活化能变化的变化。

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