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首页> 外文期刊>Journal of Applied Polymer Science >Kinetic and rheokinetic study of dicarboxylic fatty acid chain extension using a dioxazoline coupling agent
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Kinetic and rheokinetic study of dicarboxylic fatty acid chain extension using a dioxazoline coupling agent

机译：使用二恶唑啉偶联剂的二羧酸脂肪酸链延长的动力学和流变动力学研究

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摘要

A kinetic and rheokinetic study of the condensation reaction of a dicarboxylic fatty acid, Pripol 1009 (C36), and a dioxazoline coupling agent (1,3-Phenylene)-bis(2-Oxazoline) (OO) was made. The kinetic study showed a similar reactivity of the two acid groups of C36 and also a similar reactivity of the two oxazoline groups of OO. The reaction kinetics can be described using a second-order kinetic model. A kinetic constant k = 16.1×10-4 mol-1 s-1 at 156 °C with an activation energy Eα = 80.6 kJ mol-1 was calculated. A rheological evaluation of the reactants and the obtained polymers showed that the reactive system had Newtonian behavior during all the reaction times for shear rates lower than 100 s-1. Using this kinetic modeling and measured viscosity evolution of the reactive system at different temperatures, rheokinetic models were proposed for viscosity evolution with the molar mass evolution of the synthesized polymer and the reaction time and conversion. Viscosity evolution of the reactive system during the first 10 min, corresponding to a typical mean residence time in reactive extrusion, were calculated using the proposed rheokinetic model.
机译：进行了二羧酸脂肪酸Pripol 1009（C36）和二恶唑啉偶联剂（1,3-苯撑）-双（2-恶唑啉）（OO）的缩合反应的动力学和流变动力学研究。动力学研究显示C36的两个酸基团具有相似的反应性，并且OO的两个恶唑啉基团具有相似的反应性。可以使用二级动力学模型描述反应动力学。计算了在156°C下的激活常数Eα= 80.6 kJ mol-1的动力学常数k = 16.1×10-4 mol-1 s-1。对反应物和所得聚合物的流变评价表明，在剪切速率低于100 s-1的所有反应时间内，反应体系均具有牛顿行为。利用该动力学模型并在不同温度下测量反应体系的粘度演变，提出了流变动力学模型，用于随着合成聚合物的摩尔质量演变以及反应时间和转化率的粘度演变。使用提出的流动力学模型，计算了反应体系在最初的10分钟内的粘度演变，对应于反应挤出中的典型平均停留时间。

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