CAREER: Research and Education on Multi-Scale Structure Development in Chaotic Mixing of Polymers

职业：聚合物混沌混合中多尺度结构发展的研究和教育

• 批准号: 0134106
• 负责人: Sadhan Jana
• 金额: $ 37.5万
• 依托单位: University of Akron
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-02-15 至 2007-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0134106&HistoricalAwards=false
• 关键词: CAREER; Research; Education; Multi; Scale

This Faculty Early Career Development (CAREER) award focuses on research and education on the subject of evolution of multi-scale structures of polymeric material during processing. The influence of these evolving structures on mechanical, electrical, and thermal properties in chaotic mixing of miscible and immiscible polymers and nanofiller systems under controlled conditions of strain rates and temperatures is experimentally investigated. Chaotic mixing offers the following highly desirable attributes: (a) mixing occurs by both shear and extensional flow components, (b) polymer-polymer or polymer-filler interfacial areas are created at exponential rates, with much less energy consumption for the same degree of mixing than in conventional extrusion processes, (c) self-similar mixing microstructures are formed by repeated stretching and folding of the interfaces, showing nested striations, droplets, or layers of one polymer in the other leading to potential morphologies so far not achieved in conventional single and twin-screw extrusion schemes and (d) mixing uniformity is achieved with retention of self-similar microstructures, as opposed to randomization in conventional single- and twin-screw extruders. Rapid interfacial area generation will expedite reactions between functional polymers in reactive processing and in compatibilization in addition to rapid reduction in dispersed domain sizes. The self-similar microstructures produced will offer preferred orientation of the crystallites/dispersed phases for augmentation of anisotropic electrical, mechanical, and chemical properties and will act as tools for creating unusual morphologies for design of polymer products with tailored properties. The study to be undertaken using twin-rotor chaotic batch mixer and continuous chaotic mixer will yield low cost, rapid, and energy-efficient mixing technology for scale-up studies, optimization of existing products, and process development in association with industrial partners. The education program will provide hands-on polymer education to high school and undergraduate students, including minority, through summer research and senior research projects and through participation in seminars and presentations. A new course will be developed on the applications of chaotic mixing in materials processing for graduate students and industry, which will draw heavily from the proposed research activities. In addition, web based course modules will be designed on rheology and polymerization reactor engineering to reach a much larger body of students outside conventional classrooms.

该学院早期职业发展（CAREER）奖专注于研究和教育，主题是加工过程中聚合物材料的多尺度结构的演变。这些不断发展的结构的机械，电气和热性能的影响，在混沌混合的混溶和不混溶的聚合物和纳米填料系统的应变速率和温度的控制条件下进行实验研究。 混沌混合提供了以下非常理想的属性：（a）通过剪切和拉伸流动分量两者发生混合，（B）聚合物-聚合物或聚合物-填料界面面积以指数速率产生，对于相同程度的混合，能量消耗比常规挤出方法少得多，（c）通过界面的重复拉伸和折叠形成自相似混合微结构，显示出一种聚合物在另一种聚合物中的嵌套条纹、液滴或层，导致迄今为止在常规单螺杆和双螺杆挤出方案中未实现的潜在形态，以及（d）与常规单螺杆和双螺杆挤出机中的随机化相反，在保持自相似微结构的情况下实现混合均匀性。快速界面面积的产生将加速反应性加工和增容中功能聚合物之间的反应，此外还可快速减小分散域尺寸。 所产生的自相似微结构将提供微晶/分散相的优选取向，用于增强各向异性的电、机械和化学性质，并且将充当用于创建具有定制性质的聚合物产品的设计的不寻常形态的工具。使用双转子混沌间歇混合器和连续混沌混合器进行的研究将产生低成本，快速和节能的混合技术，用于规模扩大研究，优化现有产品，并与工业合作伙伴一起进行工艺开发。该教育计划将通过夏季研究和高级研究项目以及通过参加研讨会和演讲，为高中和本科生（包括少数民族）提供实践聚合物教育。将为研究生和工业界开发一门关于混沌混合在材料加工中的应用的新课程，这将大量借鉴拟议的研究活动。此外，基于网络的课程模块将被设计在流变学和聚合反应器工程，以达到传统教室以外的学生更大的身体。