Molecular Design of Polymer Interfaces at the Nanoscale: An Exploratory Study

纳米尺度聚合物界面的分子设计：探索性研究

• 批准号: 9984022
• 负责人: Balaji Narasimhan
• 金额: $ 5万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-05-01 至 2001-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9984022&HistoricalAwards=false
• 关键词: Molecular; Design; Polymer; Interfaces; Nanoscale

ABSTRACTCTS-9984022Rutgers UniversityThe overall of his research proposal is to provide a basis to design engineer partially miscible polymer interfaces by obtaining meaningful relationships between molecular information information (interdiffusion mechanisms) and macroscopic properties (fracture mechanisms). Such knowledge will lead to rigorous and objective design of polymer interfaces. The adhesion of polymeric surfaces is technologically relevant in applications such as welding, melt processing, composite lamination, compatibilizer and blend technology, co-extrusion, and cracking healing among others.The system chosen is polystyrene/brominated polystyrene (PS/PBS), a partially miscible blend, which lends itself to be conveniently investigated for both interdiffusion and fracture measurements over a wide range of identical physicochemical conditions. The first phase of the research seeks to elucidate the mechanism of interdiffussion by quantitative understanding of the dynamics of macromolecular chains at interfaces.The second component of the research will be directed towards relating the molecular information obtained from interfacial dynamics studies to the strength of the interface. The fracture energy of PS/PBS specimens will be measured using a modified double cantilever beam test interfaced with a tele-miscroscope and an electronic speckle pattern interferometer. The knowledge derived from this research will be pivotal to the rational design and control of polymer interfaces relevant to high performance materials, such as bioadhesives, electronic materials, and high performance nanocomposites.

他的总体研究计划是通过获得分子信息信息（相互扩散机制）与宏观性质（断裂机制）之间有意义的关系，为设计工程师部分可混相聚合物界面提供基础。这些知识将导致严格和客观的聚合物界面设计。聚合物表面的粘附在焊接、熔体加工、复合材料层压、增容剂和混合技术、共挤出和裂纹愈合等应用中具有技术相关性。所选择的体系是聚苯乙烯/溴化聚苯乙烯（PS/PBS），这是一种部分混相共混物，可以在相同的物理化学条件下方便地进行相互扩散和裂缝测量。研究的第一阶段旨在通过对界面大分子链动力学的定量理解来阐明相互扩散的机制。研究的第二个组成部分将是将从界面动力学研究中获得的分子信息与界面强度联系起来。PS/PBS试样的断裂能将采用改进的双悬臂梁试验，结合远程显微镜和电子散斑干涉仪进行测量。从这项研究中获得的知识将对与高性能材料（如生物粘合剂、电子材料和高性能纳米复合材料）相关的聚合物界面的合理设计和控制至关重要。