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（宾夕法尼亚大学）材料科学与工程（MSE）Yang实验室的聚合物合成、制造和表征，宾夕法尼亚大学/MSE李实验室与通用汽车全球研发中心（GM）谢实验室合作进行的分子和元结构（有序阵列）水平的理论建模。 它以他们在形状记忆聚合物 (SMP) 化学和表面化学方面的知识为基础，以实现坚固的工业规模粘合。该提案的重点是根本上尚未解决的问题，即表面化学、形貌和不同长度尺度下粘附力的单独和组合作用。 具体来说，PI 计划： (1) 制造 SMP 柱阵列，并精确控制尺寸、长宽比和间距； (2) 接枝良好控制的聚合物刷以操纵分子相互作用（例如氢键和离子-π相互作用）以进行键合和脱键合； (3) 系统地研究变形和恢复下互补 SMP 柱上的粘附和剥离，以及 (4) 将实验结果与每个相关长度尺度的多尺度模型进行比较，并形成联锁干粘附的完整机制视图。非技术摘要：聚合物之间的粘合力在广泛的工业应用中发挥着重要作用。液体粘合剂提供了很强的粘合力，但它们的热固化是能源密集型的，并且粘合力通常是不可逆的。大自然为我们提供了可逆干粘合的显着例子，如牛蒡种子和壁虎脚毛所示，其中粘合附着不涉及液体或长时间固化。该提案旨在开发类似仿生强力胶、但可返工的干粘合剂。它不仅将提供重要的科学见解，还将影响广泛的技术，包括电子封装、汽车和飞机装配以​​及软机器人技术。各个级别的学生都将通过新的培训和推广机会接触到化学、材料科学与工程、软力学、纳米制造和计算建模等各种主题，包括通用汽车工业研究员的夏季讲座、研究成果与课程的整合、高中生和本科生通过夏季研究和高级设计项目的参与，以及通用汽车全球研发中心的博士生的工业实习。研究成果还将创造一个重要的机会来激发公众的兴趣，从而激发他们对科学、技术、工程和数学 (STEM) 的兴趣。