Fundamental Mechanisms of Adhesion at the Fiber-Matrix Interface

纤维-基体界面粘合的基本机制

• 批准号: 8821031
• 负责人: Lynn Penn
• 金额: $ 18.53万
• 依托单位: Polytechnic University of New York
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-03-01 至 1992-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8821031&HistoricalAwards=false
• 关键词: Fundamental; Mechanisms; Adhesion; Fiber; Matrix

The nature of the interface between the fiber and matrix in fiber- reinforced polymers greatly influences overall performance of the composite material. The details of the interactions at this interface are not well understood, however. It is firmly established that modifying the interface can greatly improve performance, the underlying physicochemical mechanisms of adhesion and their relationship to performance have not been established. The three main mechanisms believed to underly the adhesive interaction are mechanical interactions, intermolecular interactions, and chemical binding. Preliminary work by the investigator has shown that a small number of pendant chains covalently attached to a fiber surface significantly increases adhesion between fiber and matrix. An experimental program has been designed to examine the exact cause of the increased adhesion by systematically modifying the surface of Aramid Fibers with pendant groups whose chemical structure provides varying potential for physicochemical interaction with the matrix. A key phase of the research is experimental determination of the exact state of the surface and the pendant groups by means of quantitative dye analysis, nonradiative fluorescence energy transfer, and continuous wetting force measurements. Results will be correlated with adhesion data to delineate the relation between molecular level interfacial details and interfacial adhesive bonding. There is no more important area of research, relative to the future international competitiveness of American industry, than the area of advanced composite materials. The properties of a fiber composite are determined by the matrix, the fiber, and the interface at which they interact. Obtaining understanding and control of this interface is crucial to our ability to engineer composite materials so as to realize their full potential.

纤维增强聚合物中纤维和基体之间界面的性质极大地影响复合材料的整体性能。 然而，该界面交互的细节尚不清楚。 众所周知，改性界面可以极大地提高性能，但粘合的潜在物理化学机制及其与性能的关系尚未确定。 据认为，粘合相互作用的三种主要机制是机械相互作用、分子间相互作用和化学结合。 研究人员的初步工作表明，少量共价连接到纤维表面的侧链显着增加了纤维和基质之间的粘附力。 设计了一个实验程序，通过用侧基系统地改性芳纶纤维的表面来检查粘合力增加的确切原因，侧基的化学结构提供了与基质发生物理化学相互作用的不同潜力。 该研究的一个关键阶段是通过定量染料分析、非辐射荧光能量转移和连续润湿力测量来实验确定表面和侧基的确切状态。 结果将与粘合数据相关联，以描述分子级界面细节和界面粘合之间的关系。 相对于美国工业未来的国际竞争力，没有比先进复合材料领域更重要的研究领域了。 纤维复合材料的性能由基体、纤维以及它们相互作用的界面决定。 理解和控制这个界面对于我们设计复合材料以充分发挥其潜力至关重要。