Collaborative Research: Deformation-Dependent Adhesion of Stretched Compliant Networked Polymer Systems

合作研究：拉伸柔顺网络聚合物系统的变形依赖性粘附

• 批准号: 2129465
• 负责人: Chelsea Davis
• 金额: $ 39.13万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-01-01 至 2024-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2129465&HistoricalAwards=false
• 关键词: Collaborative; Research; Deformation; Dependent; Adhesion

This grant will focus on developing a fundamental understanding of how changing the shape of soft, adhesive materials -- for example, through stretching or compression -- modifies their adhesive properties. Modern theories of adhesion were originally developed to describe contact with relatively stiff materials like rubber, but much softer sticky materials are ubiquitous in biology, medicine, engineering, and everyday consumer products. Over the past decade, soft solid surface mechanics has emerged as an exciting new field of study, driven largely by the surprising discovery that classic theories fail to describe the contact behavior of compliant materials and that soft materials adhere very differently than their stiffer counterparts. Recent experiments, theory, and simulations have revealed a rich array of new physics and suggest a powerful new design space for engineering applications. The fundamental discoveries and materials developed through this research project will enable the development of new strain-controlled, responsive adhesives and will also involve student researchers at various stages of their educational careers from undergraduates to postdoctoral scholars. An “Adhesion Engineering Summer Camp” will be established to bring Williams College students to visit Purdue University each summer of the project.The surface properties of compliant polymers have been shown to change as a function of bulk deformation in previously-unanticipated ways. While recent debates over the nature of strain-dependent surface stress in soft solids have motivated numerous experimental and theoretical studies, much less work has focused on strain-dependent adhesion. By performing measurements that directly investigate the normal adhesive response of compliant network polymer systems as a function of both quasi-static and dynamic deformation using integrated mechanical testing and direct imaging, this project will establish a fundamental understanding of how the adhesion of soft materials is modified by deformation across a broad range of length scales, time scales, and material properties. The interplay between strain, adhesion energy, network architecture, and material relaxation mechanisms will be investigated through the experimental, numerical, and theoretical work in this collaborative grant. The specific research objectives of the project will be to (i) quantify quasistatic adhesion to stretched, compliant network polymer systems across length scales and (ii) characterize the adhesive response of compliant networked polymer systems during dynamic deformation.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该补助金将重点发展对如何改变柔软粘合材料形状的基本理解-例如，通过拉伸或压缩-修改其粘合性能。现代粘附理论最初是为了描述与相对坚硬的材料（如橡胶）的接触而开发的，但软得多的粘性材料在生物学，医学，工程和日常消费品中无处不在。在过去的十年中，软固体表面力学已经成为一个令人兴奋的新研究领域，主要是由于令人惊讶的发现，即经典理论未能描述柔顺材料的接触行为，并且软材料的粘附方式与刚性材料非常不同。最近的实验，理论和模拟揭示了丰富的新物理阵列，并为工程应用提供了强大的新设计空间。通过该研究项目开发的基本发现和材料将能够开发新的应变控制，响应粘合剂，并将涉及学生研究人员在其教育生涯的各个阶段，从本科生到博士后学者。每年夏天，将建立一个“粘附工程夏令营”，让威廉姆斯学院的学生访问普渡大学的项目。顺应性聚合物的表面性质已被证明是改变作为一个功能的体积变形在以前没有预料到的方式。虽然最近的辩论在软固体中的应变相关的表面应力的性质已经激发了许多实验和理论研究，少得多的工作集中在应变相关的粘附。通过使用集成机械测试和直接成像直接研究顺应性网络聚合物系统的正常粘合剂响应作为准静态和动态变形的函数的测量，该项目将建立对软材料的粘合力如何通过变形在广泛的长度尺度，时间尺度和材料特性范围内进行修改的基本理解。应变，粘附能，网络结构和材料松弛机制之间的相互作用将通过实验，数值和理论工作在这个合作的补助金进行调查。该项目的具体研究目标将是（i）量化整个长度尺度上拉伸的顺应性网络聚合物系统的准静态粘附力，以及（ii）表征顺应性网络聚合物系统在动态变形过程中的粘附力响应。该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估来支持。