Role of Interfacial Instabilities in Multilayer Coextrusion of Polymeric Liquids

对受剪切和拉伸变形作用的多层聚合物流体的界面稳定性和动态变形进行了研究。这种方法是建模和实验的结合。建模部分包括理论稳定性分析，包括三维失稳模式和有限振幅失稳模式。实验将使用各种聚合物熔体在直线和收敛通道中模拟共挤出环境。将比较关于层的变形和稳定性的理论和实验结果。多层共挤包覆是形成高分子复合材料的重要工艺。在某些加工条件下，可能会出现不稳定性，而这些目前还无法可靠地预测。＊＊＊

9304035 Khomami An investigation is to be carried out on the interfacial stability and dynamic deformation of multilayer polymeric fluids subjected to shear and extensional deformation. The approach is a mix of modeling and experiments. The modeling component consists of theoretical stability analysis, including three dimensional and finite amplitude instability modes. The experiments will use various polymer melts in straight and converging channels to simulate a co-extrusion environment. Theoretical and experimental findings regarding layer deformation and stability will be compared. Multilayer coextrusion and coating is an important process in the formation of polymeric composite materials. Under certain processing conditions, instabilities can arise, and these cannot at present be reliably predicted. ***