Abstract

Curing process of siloxane polymer was studied by determining rate of heat released during Dynamic DSC analysis. Utilizing thermokinetics software were calculated model-free methods such as Kissinger, Flynn–Wall–Ozawa, Friedman and also model-fitting methods such as Coats Redfern. To improve accuracy, Khavam Flanagan’s combined method was utilized and the third-order Avrami model was determined. Simulation of the curing process was done using OpenFOAM open-source software based on the finite volume method. Simulation results were validated using DSC Isothermal data. The results of the simulated sample were in good agreement with the experimental data. The curing time was investigated in cylindrical, spherical, and cubic shapes. The longest curing time was assigned to sphere geometry and the least to rectangular cubes with equal length and width. To achieve the optimal curing method, the influence of various parameters on the curing process of polysiloxane, including oven temperature, mold geometry, boundary conditions (effect of curing in a fan oven) and geometry dimensions, resin density, and thermal conductivity coefficient were investigated.

中文翻译：

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通过实验和数值模拟研究硅氧烷固化过程

摘要

通过测定动态 DSC 分析过程中的放热速率来研究硅氧烷聚合物的固化过程。利用热动力学软件计算无模型方法，例如 Kissinger、Flynn-Wall-Ozawa、Friedman 以及模型拟合方法，例如 Coats Redfern。为了提高精度，采用Khavam Flanagan的组合方法，确定了三阶Avrami模型。采用基于有限体积法的OpenFOAM开源软件对固化过程进行了模拟。使用 DSC 等温数据验证模拟结果。模拟样品的结果与实验数据吻合良好。研究了圆柱形、球形和立方体形状的固化时间。球形几何形状的固化时间最长，长度和宽度相等的矩形立方体的固化时间最短。为了实现最佳固化方法，研究了各种参数对聚硅氧烷固化过程的影响，包括烘箱温度、模具几何形状、边界条件（在风扇烘箱中固化的效果）和几何尺寸、树脂密度和导热系数。