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Development of the Numerical Simulation Codes of the Non-isothermal Polymer Processing Containing Melting. Mixing and Kneading Processes That Are Important for the Finished Morphology or Properties of Polymer Products

包含熔融的非等温聚合物加工数值模拟代码的开发。

基本信息

批准号：
11555201
负责人：
FUNATSU Kazumori
金额：
$ 8.9万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

The purpose of this research is developing the 2- or 3-dimensional heat transfer and flow analysis programs of non-Newtonian flow with a reaction or viscoelastic flow, which becomes important in a functional polymer material or products developments in polymer processing. The developed simulation programs were applied to various extrusion processes, and the validities were shown by the comparison with experiment data. The main results of this research are summarized as follows ;1. The developed 3-d simulation programs were applied to the melt mixing process in twin screw extruders (TSEs). They show that the experimental data of the pressure and temperature were described comparatively well and prediction of the change of the molecular weight distribution by the reaction in the different kinds of configuration of TSEs was described qualitatively. Moreover, the distributive and dispersive mixings of the 4 kinds of configurations in TSEs were analyzed by the marker tracing procedure with … More the proposed evaluation models. Search of the geometry and the operation conditions of TSEs that attain both the uniform mixture and temperature in a melt mixing region will be possible by these programs.2. The viscoelastic numerical simulation programs show that the reliability of nonlinear viscoelastic models plays important roles on the prediction of the extrudate shape in comparing the practical level's experimental data of the die swell phenomenon in blow molding and a hollow-fiber spinning process, and of the necking phenomenon in a film casting process. Although the useful procedure of controlling the process based on the results from the numerical analysis was proposed, the experimental detail verifications may be required from now on.3. The numerical analysis programs that predict the change of morphology under flow were developed. They show that a remarkably oriented morphology is predicted by the viscoelastic stress in simple shear flow, the particle method is able to describe a deformation and breakup of a droplet and will be possible for describing the unfilled region of TSEs. However, the unsolved problems of the numerically instability, experimental verification in a practical use level, a large amount of calculation cost, and practical modeling of the phenomenon were left behind.As mentioned above, there are some limitations to the developed numerical simulation programs when applying to the practical polymer processing. However, the visualization and analysis of the polymer processing under practical conditions and the proposal of mechanisms that give effective procedures of controlling the process based on the theoretical considerations will be quite useful for an optimization and design of the processing with reducing the conventional experimental trial and error and shortening of material development cost and development period. In future, we would like to advance the applicability of the developed programs in practical level of multiphase flows in polymer processing. Less

本研究的目的是开发具有反应流动或粘弹性流动的非牛顿流动的二维或三维传热和流动分析程序，这在功能聚合物材料或聚合物加工产品的开发中具有重要意义。将所开发的仿真程序应用于各种挤压过程，并与实验数据进行了对比，验证了仿真程序的有效性。本研究的主要成果总结如下：1.研究结果：将所开发的三维模拟程序应用于双螺杆挤出机的熔体混合过程。结果表明，压力和温度的实验数据得到了较好的描述，并定性地预测了在不同构型的tse反应中分子量分布的变化。此外，采用标记跟踪方法对4种构型在tse中的分布和分散混合进行了分析。通过这些程序可以搜索在熔体混合区域内达到均匀混合和均匀温度的tse的几何形状和操作条件。粘弹性数值模拟程序表明，通过对吹塑和空心纤维纺丝过程中的胀模现象和膜铸造过程中的缩颈现象的实际水平实验数据的比较，非线性粘弹性模型的可靠性对挤出物形状的预测起着重要的作用。虽然提出了基于数值分析结果控制过程的有用方法，但今后可能需要进行详细的实验验证。开发了预测流动条件下结构形态变化的数值分析程序。结果表明，在简单剪切流动中，粘弹性应力预测了明显的定向形貌，粒子方法能够描述液滴的变形和破裂，并将有可能描述tse的未填充区域。然而，数值不稳定性、实际应用层面的实验验证、大量的计算成本以及对该现象的实际建模等问题尚未得到解决。如上所述，开发的数值模拟程序在应用于实际聚合物加工时存在一些局限性。然而，在理论考虑的基础上，对实际条件下的聚合物加工过程进行可视化分析，并提出有效控制过程的机理，将对工艺的优化设计具有重要意义，从而减少传统的实验试错，缩短材料开发成本和开发周期。未来，我们希望将开发的程序在聚合物加工多相流的实际水平上的适用性进一步提高。少