Controlling the Microstructure of Materials Using Processing Flows

使用加工流程控制材料的微观结构

• 批准号: 9421015
• 负责人: Julia Kornfield
• 金额: $ 26万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-02-15 至 1998-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9421015&HistoricalAwards=false
• 关键词: Controlling; Microstructure; Materials; Using; Processing

ABSTRACT CTS-9421015 Julia Kornfield The structure of polymeric materials under the effect of hydrodynamical forces will be experimentally investigated, with application to designing and processing materials with engineered macroscopic properties. Two, model polymeric materials with intrinsically anisotropic structures have been selected as model materials, block copolymers and side-group liquid crystals. Molecular and microstructural flow-induced alignments will be measured as a function of macroscopic stress and strain during floe, at different length scales. A series of mechanical, optical and Nuclear magnetic Resonance (NMR) techniques developed by the P.I. will be used to monitor the structural evolution of polymer melts during continuous and oscillatory shear motion. It is expected that the results of the research will guide the polymer selection and the corresponding processing steps require to achieved a desired microstructural alignment and macroscopic properties. The project combines fundamental experiments and new ideas for industrially relevant polymeric materials and devices. Innovative ideas are proposed concerning the use of flow induced microstructures in polymers, and use of stress to switch the structure and related properties of a polymer between two states. ***

摘要CTS-9421015 Julia Kornfield 实验将研究流体动力作用下聚合物材料的结构，并将其应用于设计和加工具有工程宏观性能的材料。 第二，选择具有本征各向异性结构的模型聚合物材料作为模型材料，包括嵌段共聚物和侧基液晶。 分子和微观结构的流动诱导的路线将被测量为宏观应力和应变的函数，在不同的长度尺度。 一系列的机械，光学和核磁共振（NMR）技术开发的P.I.将用于监测聚合物熔体在连续和振荡剪切运动过程中的结构演变。 预计研究结果将指导聚合物的选择和相应的加工步骤，以实现所需的微观结构排列和宏观性能。 该项目结合了工业相关聚合物材料和设备的基础实验和新思路。 创新的想法，提出了有关使用的流动诱导的微观结构的聚合物，并使用应力切换的结构和相关性能的聚合物之间的两种状态。 ***