Application of Dynamic Spectroscopic Methods to the Rheo-Optical Characterization of Polymers

动态光谱方法在聚合物流变光学表征中的应用

• 批准号: 0315461
• 负责人: John Rabolt
• 金额: $ 46万
• 依托单位: University of Delaware
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2007-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0315461&HistoricalAwards=false
• 关键词: Application; Dynamic; Spectroscopic; Methods; Rheo

The intellectual merit of this work is three-fold: 1) it will provide molecular information on structural reorientation and reorganization in polymers on a time scale not previously available from any other characterization technique; 2) it will advance our understanding of the fundamental molecular mechanism of polymer elastic and inelastic deformation and fracture; and, 3) it will provide a correlation between polymer chemical architecture and deformation properties that can be used as a template for engineering materials with enhanced properties. In addition, the knowledge from this study will be transferable to other "soft" materials areas including bio-inspired and bio-derived materials, many of which are used in cell scaffold and tissue engineering applications. The broader impact of the proposed research activities extends to the students and postdoctoral fellows that will be trained to use state-of-the-art spectroscopic instruments to obtain time-resolved information on film drawing and fracture that will lead to an understanding of the physics associated with polymer deformation. From a more practical perspective, the use of most films in commercial processes from microelectronics to food packaging involves film orientation to produce improved mechanical and electronic properties. An understanding of the correlation between structure development, processing history and properties would provide a template by which "value" can be added to commodity materials through advanced processing techniques, an impact that would be pervasive across many industrial sectors.

这项工作的智力价值有三个方面：1)它将在以前任何其他表征技术所不能提供的时间尺度上提供关于聚合物结构重新定向和重组的分子信息；2)它将促进我们对聚合物弹性和非弹性变形和断裂的基本分子机制的理解；3)它将提供聚合物化学结构与变形特性之间的关联，可用作具有增强性能的工程材料的模板。此外，这项研究的知识将被转移到其他“软”材料领域，包括生物启发材料和生物衍生材料，其中许多用于细胞支架和组织工程应用。拟议研究活动的更广泛影响将延伸到学生和博士后研究员，他们将接受培训，使用最先进的光谱仪器获得关于胶片绘制和断裂的时间分辨信息，这将导致对与聚合物变形相关的物理学的理解。从更实际的角度来看，从微电子到食品包装，大多数薄膜在商业过程中的使用都涉及到薄膜取向，以产生更好的机械和电子性能。了解结构发展、加工历史和性能之间的关系将提供一个模板，通过先进的加工技术为商品材料增加“价值”，这一影响将普遍存在于许多工业部门。