纤维增强高聚物共混物注射成形纤维取向与多相形态微结构演化的多尺度模拟与实验研究

Reasonable prediction and control of the short fiber orientation and multi-phase morphology of the fiber-reinforced polymer blends in the injection molding can enhance the reinforcing modification effect of the polymers and thus various performance of the final product. This project intends to systematically study the theoretical modeling method for the evolution of the short fiber orientation and multiphase morphology during the injection molding of fiber-reinforced polymer blends, and establish a two-scale coupled numerical model as well as a reliable solving scheme for three-dimensional macroscopic viscoelastic unsteady flow and mesoscopic structure evolution. Taking use of the injection molding test in addition, the changing rules of the macro-mechanical properties and micro-structure parameters of the material under different forming conditions are explored, revealing the processing-structure-performance evolution mechanism, so as to reasonably adjust the processing conditions and mold structure and control the microstructure of the final product, producing a guidance for the optimization of the products performance. The established project combines theoretical research with processing experiments to establish key theories and methods for polymer processing control, also applied to other forming processes such as extrusion and blow molding, therefore rich in theoretical research significance and engineering application prospects.

合理预测及控制纤维增强高聚物共混物在注射成形加工过程中，材料内部的短纤维取向和多相形态等微结构，可以提高高聚物的增强改性效果，改善最终制品的各项性能。本项目拟系统研究纤维增强高聚物共混物注射成形过程中短纤维取向和多相形态演化的理论建模方法，建立三维宏观粘弹性非定常流动与介观微结构演化的双尺度耦合数值模型和求解方案，并结合注射成形工艺试验研究，探讨不同成形加工条件下材料的宏观力学性能与微结构参数的变化规律，揭示加工历史—形态—性能演变机理，从而通过合理调整成形工艺条件与模具结构，控制最终制品内部的微结构，为优化成形制品性能提供指导。项目将理论研究与工艺实验相结合，旨在建立高聚物成形工艺控制关键理论和方法，所建立的方法和结论还可推广应用于挤出、吹塑等多种高聚物成形工艺，具有理论研究意义和工程应用前景。

合理预测及控制纤维增强高聚物共混物在注射成形加工过程中，材料内部的短纤维取向和多相形态等微结构，可以提高高聚物的增强改性效果，改善最终制品的各项性能。本项目系统研究纤维增强高聚物共混物注射成形过程中短纤维取向和多相形态演化的理论建模方法，建立三维宏观粘弹性非定常流动与介观微结构演化的双尺度耦合数值模型和求解方案，并结合注射成形工艺试验研究，探讨不同成形加工条件下材料的宏观力学性能与微结构参数的变化规律，揭示加工历史—形态—性能演变机理，从而通过合理调整成形工艺条件与模具结构，控制最终制品内部的微结构，为优化成形制品性能提供指导。项目将理论研究与工艺实验相结合，旨在建立高聚物成形工艺控制关键理论和方法，所建立的方法和结论还可推广应用于挤出、吹塑等多种高聚物成形工艺，具有理论研究意义和工程应用前景。