GOALI: A Multiscale Approach on Interfacial and Structural Interlocking Between Polymer Grafted Shape Memory Pillars

GOALI：聚合物接枝形状记忆柱之间界面和结构联锁的多尺度方法

• 批准号: 1105208
• 负责人: Shu Yang
• 金额: $ 39万
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-15 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1105208&HistoricalAwards=false
• 关键词: GOALI; Multiscale; Approach; Interfacial; Structural

TECHNICAL SUMMARY:The award is based on complementary research activities, including polymer synthesis, fabrication and characterization in Yang's lab in Materials Science and Engineering (MSE) at the University of Pennsylvania (Penn), theoretical modeling at the molecular and meta-structural (ordered array) levels in Li's lab at Penn/MSE, in collaboration with Xie's lab at General Motors Global Research & Development Center (GM). It builds upon their knowledge in shape memory polymer (SMP) chemistry and surface chemistry toward robust and industrial scale adhesion. The focus of this proposal is on the fundamentally unresolved question concerning the individual and combined roles of surface chemistry, topography, and compliance on adhesion at different length scales. Specifically, the PIs plan to: (1) fabricate SMP pillar arrays with precise control over size, aspect ratio, and spacing; (2) graft well-controlled polymer brushes to manipulate molecular interactions (e.g. H-bonding and ion-pi interactions) for both bonding and debonding; (3) systematically study adhesion and peeling off on complementary SMP pillars under deformation and recovery, and (4) compare experimental results with multiscale modeling throughout each relevant lengthscale and develop a complete mechanistic view of interlocking dry adhesion. NON-TECHNICAL SUMMARY:Adhesion between polymers plays an important role in a wide range of industrial applications. Liquid based adhesives offer strong adhesion, however their thermal curing is energy intensive and the adhesion is generally not reversible. Nature provides us with remarkable examples of reversible dry adhesion as manifested in burdock seeds and gecko foot hairs, where no liquid or lengthy curing is involved in the adhesive attachment. This proposal seeks to develop biomimetic superglue-like, yet reworkable, dry adhesives. It will not only provide important scientific insights, but also impact a wide range of technologies, including electronic packaging, automotive and airplane assemblies, and soft robotics. Students at all levels will be exposed to a diverse range of topics in chemistry, materials science and engineering, soft mechanics, nanofabrication and computational modeling through new training and outreach opportunities, including summer lectures by the industrial researcher from General Motors, integration of the research outcome in courses, engagement of high school and undergraduate students through summer research and senior design projects, and industrial internship by a PhD student at General Motors Global R&D Center. The research outcome will also create a significant opportunity to excite the general public, thereby engaging their interest in Science, Technology, Engineering, and Mathematics (STEM).

技术摘要：该奖项基于互补的研究活动，包括宾夕法尼亚大学材料科学与工程（MSE）的聚合物合成，制造和表征与Xie的实验室合作，在宾夕法尼亚州/MSE的Li实验室中的阵列）与General Motors全球研发中心（GM）合作。 它建立在他们在形状记忆聚合物（SMP）化学和表面化学方面的知识上，朝着稳健和工业尺度的粘附力。该提案的重点是关于表面化学，地形和依从性在不同长度尺度上粘附的个人和综合作用的根本未解决的问题。 具体而言，PIS计划：（1）制造具有精确控制大小，纵横比和间距的SMP支柱阵列； （2）用于操纵分子相互作用（例如H键和ION-PI相互作用）的移植物良好控制的聚合物刷以键合和脱键型； （3）系统地研究了在变形和恢复下的互补SMP支柱上的粘附和剥离，（4）将实验结果与每个相关长度的多尺度建模进行比较，并在每个相关的长度上进行多尺度建模，并在互锁干燥粘附方面提供完整的机械视图。非技术摘要：聚合物之间的粘附在广泛的工业应用中起重要作用。基于液体的粘合剂具有较强的粘附力，但是它们的热固化是能量密集型的，并且粘附通常不可逆。大自然为我们提供了可逆的干粘附力的显着例子，如牛s种子和壁虎脚毛，在粘合剂附件中不涉及液体或冗长的固化。该提案旨在开发仿生的超级胶状，但可重新设计的干燥粘合剂。它不仅将提供重要的科学见解，还会影响广泛的技术，包括电子包装，汽车和飞机组件以及软机器人技术。各个级别的学生将通过新的培训和推广机会，包括化学，材料科学和工程，软机制，纳米制作和计算建模的各种主题，包括通用汽车的工业研究人员的夏季演讲通过夏季研究和高级设计项目，课程，高中和本科生的互动以及在General Motors全球研发中心的博士生实习的结果。研究结果还将创造一个巨大的机会来激发公众，从而引起他们对科学，技术，工程和数学（STEM）的兴趣。