中文摘要：

在聚合反应挤出过程中，化学热效应显著影响材料体系温度，从而影响反应速率以及高分子材料结构与流变性能。采用有限体积方法，数值分析了甲基丙烯酸正丁酯在异向旋转双螺杆挤出机内的自由基聚合反应热效应，描述了反应热释放量及其强度在挤出机内的变化特点，分析了其影响因素，为反应加工条件的优化设计提供了理论依据。

英文摘要：

The chemical calorific effect has a great influence on the temperature, the reaction rate, the polymer material structure and rheological property in reactive extrusion processes for polymerization. The calorific effect of the free radical polymerization of n-butylmethacrylate in counterrotating twin screw extruders was numerically simulated by means of the finite volume method and a semi-implicit iterative algorithm. The evolution characteristics and the influencing factors of the heat of chemical reaction and the reactive calorific intensity were discussed in detail, on the basis of which, the reactive processing conditions can be optimized.