GOALI: Pulverization and Agglomeration Polymeric Materials Using High Shear and Normal Forces

本文采用实验和计算相结合的方法，对聚合物材料挤出粉碎过程中的基本机理进行了研究。材料被输送到挤出机，在那里它们被加热以形成聚合物材料的连续薄膜，然后冷却，并在固态下暴露在高剪切力和压缩力下，以及通过诱导应力的快速松弛。这会导致粉化。材料可以是热塑性、热固性和弹性体。实验将使用圆盘状样品来模拟粉碎和最终团聚之前的应力状态及其演变。采用有限元方法模拟变形过程，包括边界滑移、材料断裂、摩擦、烧结和团聚等。这是一个与Amoco和W.R.Grace Co合作的GOALI(学术与行业互动赠款机会)项目。行业合作伙伴将参与并为研究工作提供反馈。预计这项研究将产生一个建模框架，包括粉碎过程的控制参数，以及粉碎、团聚和放大的标准。粉碎过程与制造工艺、聚合物回收、纺织工业和管道涂层相关。***

Abstract CTS- 9629650 H. Arastoopour and B. Bernstein, Illinois Institute of Technology A combined experimental and computational study is undertaken to understand the basic mechanisms in the pulverization process of polymeric materials by extrusion. The materials are conveyed to an extruder where they are heated to form a continuous film of polymeric materials, followed by cooling and exposure in solid state to high shear and compressive forces, and by rapid relaxation of the induced stresses. This results in pulverization. The materials may be thermoplastics, thermosetting and elastomers. The experiments will use disk-shaped samples to model the stress state and its evolution before pulverization and eventual agglomeration. Finite element method will be applied to simulate the deformations, including boundary slip, material fracture, friction, sintering, and agglomeration. This is a GOALI (Grant Opportunity for Academic Interaction with Industry) project in collaboration with Amoco and W.R. Grace Co. The industrial partners will participate and provide feedback to the research work. It is expected that the study will lead to a modeling framework, including the controlling parameters of the pulverization process, and criteria of pulverization, agglomeration, and scale-up. The pulverization process has relevance to manufacturing processes, polymer recycling, textile industry, and pipe coating. ***