In this work, isothermal curing kinetics of a non-catalysed and non-blown reaction between castor oil based polyester polyol and polymeric 4, 4’-diphenyl methane diisocyanate (MDI) has been investigated using Differential Scanning calorimeter (DSC) and viscosity build up studies. Several phenomenological models like Ozawa, Kissinger and Kissinger- Akahira-Sunose (KAS) isoconversional methods has been adopted to study polymerisation kinetics through DSC. DSC cure kinetics is studied at different heating rates (5°C/min, 10°C/min, 15°C/min and 20°C/min). Viscosity build up studies are also done for evaluating the kinetic parameters. These studies have been conducted for an isocyanate index [NCO equivalents/OH equivalents] of 1:1 and 1:2. Dynamic viscosity is measured as a function of time and rate constant and activation energy of the curing system is evaluated. Activation energy obtained for 1:1 index through Ozawa and Kissinger methods is found to be in the range of 70kJ/mol and for 1:2 index it is found to be in the range of 50kJ/mol. Thermodynamic parameters like Gibb’s free energy (Activation Free Energy), activation enthalpy and activation entropy of the polymerisation kinetics is calculated using Wynne-Jones-Eyring-Evans Theory.

中文翻译：

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基于蓖麻油基聚酯多元醇和 4,4'-二苯基甲烷二异氰酸酯的聚氨酯网络形成的固化动力学和热力学

在这项工作中，使用差示扫描量热仪 (DSC) 和粘度增加研究了蓖麻油基聚酯多元醇与聚合 4, 4'-二苯基甲烷二异氰酸酯 (MDI) 之间非催化和非发泡反应的等温固化动力学学习。一些现象学模型如 Ozawa、Kissinger 和 Kissinger-Akahira-Sunose (KAS) 等转化方法已被用于通过 DSC 研究聚合动力学。在不同的加热速率（5°C/min、10°C/min、15°C/min 和 20°C/min）下研究 DSC 固化动力学。还进行了粘度累积研究以评估动力学参数。这些研究是针对 1:1 和 1:2 的异氰酸酯指数 [NCO 当量/OH 当量] 进行的。动态粘度作为时间和速率常数的函数进行测量，并评估固化系统的活化能。发现通过 Ozawa 和 Kissinger 方法获得的 1:1 指数的活化能在 70kJ/mol 的范围内，而对于 1:2 指数，它被发现在 50kJ/mol 的范围内。使用 Wynne-Jones-Eyring-Evans 理论计算热力学参数，如聚合动力学的 Gibb 自由能（活化自由能）、活化焓和活化熵。