Exploring Molecular Mechanisms for Spurt Flow Instability, Sharkskin-like Surface Melt Fracture and Interfacial Slip

探索喷射流不稳定性、鲨鱼皮状表面熔体断裂和界面滑移的分子机制

• 批准号: 9632466
• 负责人: Shi-Qing Wang
• 金额: $ 22.5万
• 依托单位: Case Western Reserve University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-15 至 1999-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9632466&HistoricalAwards=false
• 关键词: Exploring; Molecular; Mechanisms; Spurt; Flow

ABSTRACT Proposal Number: CTS-9632466 Principle investigator: Wang This project is aimed at developing a fundamental understanding of the melt fracture and flow instability phenomena of linear polyethylene resins. Specifically, experiments are proposed to unravel the molecular origin of spurt flow behavior and sharkskin formation. Experiments will be conducted under both controlled piston speed and constant pressure conditions. Geometry and surface dependent phenomena will be studied. The unique feature of the investigation is that the subject of melt flow instability and extrudate fraction involves a highly non-linear coupling between bulk constitutive properties and hydrodynamic boundary conditions at melt/wall and melt/melt interfaces. The proposed effort goes beyond the continuum approach and will attempt to link with micro-molecular physics. The results of this research will have wide applicability in the polymer processing industry.

摘要建议编号：CTS-9632466首席研究员：王本项目旨在对线性聚乙烯树脂的熔体断裂和流动不稳定现象有一个基本的了解。具体地说，建议通过实验来揭开喷流行为和鲨鱼皮形成的分子根源。实验将在控制活塞速度和恒压条件下进行。将研究几何和曲面依赖现象。研究的独特之处在于，熔体流动不稳定性和挤出物分数这一主题涉及到熔体/壁面和熔体/熔体界面处的本构关系和流体动力学边界条件之间的高度非线性耦合。拟议的努力超越了连续统方法，并将尝试与微分子物理学联系起来。本研究成果将在聚合物加工行业具有广泛的适用性。