CAREER: Mechanics of Damage-Tolerant Electro-Mechano-Chemically

职业：耐损伤机电化学力学

• 批准号: 1943598
• 负责人: Qiming Wang
• 金额: $ 52.37万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-05-15 至 2025-04-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1943598&HistoricalAwards=false
• 关键词: CAREER; Mechanics; Damage; Tolerant; Electro

This Faculty Early Career Development (CAREER) grant will support fundamental research to understand the coupling of color-change, self-healing, and electro-deformation of a cephalopod-inspired damage-tolerant electro-mechano-chemically responsive elastomer. Cephalopod skins, simultaneously featuring color-change for active camouflage, self-healing of wounds and injuries, and neuron-driven muscle actuation, have recently inspired novel synthetic materials for diverse engineering applications, ranging from camouflage skins, soft robotics, flexible electronics, and thermal regulators, to biomedical devices. Despite the great potential, the design of cephalopod-skin-like synthetic materials with coupled properties remains at the trial-and-error stage without theoretical guidance. This project will fill the knowledge gap by integrating theories and experiments to provide a mechanistic and quantitative understanding of the multiphysics coupling of a new synthetic elastomer with properties of force-induced color-change, self-healing, and electro-mechanical actuation. The knowledge obtained from this project may facilitate innovations of future camouflage skins for underwater robotics and aerial vehicles. The insights from this research may also help the design of affordable anthropomorphic prostheses and artificial organs to improve the life quality of millions of disabled people. Besides, the project includes an integrated education plan to train diverse groups of next-generation engineers through a variety of avenues, including engineering curriculum development, involvement of underrepresented undergraduates and high school students via summer research programs, outreach to K-12 students and teachers at Orthopaedic Hospital Medical Magnet High School, and outreach to the general public at Los Angeles EXPO Center. The synthetic elastomer consists of flexible polymer networks crosslinked by radical-forming mechanophores diarylbibenzofuranone, expecting to simultaneously enable force-induced color-change, self-healing, and electro-mechanical actuation. The central hypothesis of the project is that the polymer-network-linked mechanophores can undergo a reversible chemical reaction to trigger dissociation-induced color-change and re-associated-induced self-healing. Driven by the hypothesis, material fabrication, multiaxial mechanical testing, electromechanical actuation, mechanochromic measurement, and corresponding analytical modeling will be integrated to reveal the profound multiphysics coupling of polymer network mechanics, scission-binding chemical reactions, and electro-mechanical interactions. Specific tasks include: (1) to understand the constitutive behavior of the synthetic elastomer, (2) to elucidate the coupling of color-change and self-healing of the elastomer under mechanical loads, and (3) to decode the coupling of color-change, self-healing, and electro-deformation when the elastomer is under electro-mechanical loads. The research effort will open promising avenues for mechanistically and quantitatively understanding a feed-back-loop coupling of multiple physical fields (mechanics, chemical reaction, and electric field) within the context of stretchable soft materials.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.

该学院早期职业发展（CAREER）补助金将支持基础研究，以了解头足类动物启发的损伤耐受性机电化学响应弹性体的颜色变化，自我修复和电变形的耦合。同时具有主动伪装的颜色变化，伤口和损伤的自我愈合以及神经元驱动的肌肉驱动的Ceopalypod皮肤最近激发了用于各种工程应用的新型合成材料，从伪装皮肤，软机器人，柔性电子产品和热调节器到生物医学设备。尽管具有巨大的潜力，但具有耦合性能的头足类皮肤合成材料的设计仍然处于试错阶段，没有理论指导。该项目将通过整合理论和实验来填补知识空白，以提供一种新的合成弹性体的多物理场耦合的机械和定量理解，该弹性体具有力诱导颜色变化，自我修复和机电致动的特性。从该项目中获得的知识可能有助于未来水下机器人和飞行器伪装皮肤的创新。这项研究的见解也可能有助于设计负担得起的拟人化假肢和人工器官，以改善数百万残疾人的生活质量。此外，该项目还包括一个综合教育计划，通过各种途径培养不同群体的下一代工程师，包括工程课程开发，通过暑期研究计划参与代表性不足的本科生和高中生，在骨科医院医学磁铁高中推广K-12学生和教师，以及在洛杉矶博览中心推广公众。合成弹性体由柔性聚合物网络交联的自由基形成的mechanophores二芳基bibenzofuranone，预计同时使力诱导的颜色变化，自我修复，和机电驱动。该项目的中心假设是，聚合物网络连接的机械载体可以进行可逆的化学反应，以触发解离诱导的颜色变化和重新关联诱导的自我修复。在假设的驱动下，材料制造，多轴机械测试，机电致动，机械变色测量和相应的分析建模将被集成，以揭示聚合物网络力学，剪切结合化学反应和机电相互作用的深刻的多物理耦合。具体任务包括：（1）理解合成弹性体的本构行为，（2）阐明弹性体在机械载荷下的颜色变化和自修复的耦合，以及（3）解码当弹性体在机电载荷下时颜色变化、自修复和电变形的耦合。该研究成果将为在可拉伸软材料的背景下从机械和定量角度理解多个物理场（力学、化学反应和电场）的反馈回路耦合开辟有前途的途径。该奖项反映了NSF的法定使命，并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，被认为值得支持。

项目成果

Sticky Rouse Time Features the Self-Adhesion of Supramolecular Polymer Networks

• DOI: 10.1021/acs.macromol.1c00335
• 发表时间: 2021-05
• 期刊: Macromolecules
• 影响因子: 5.5
• 作者: Zhiqiang Shen;Huilin Ye;Qiming Wang;M. Kröger;Ying Li

Mechanics of Stretchy Elastomer Lattices

• DOI: 10.1016/j.jmps.2022.104782
• 发表时间: 2022-01
• 期刊: Journal of the Mechanics and Physics of Solids
• 影响因子: 5.3
• 作者: Yanchu Zhang;Kunhao Yu;Kyung Hoon Lee;Ketian Li;Haixu Du;Qiming Wang

Growing Living Composites with Ordered Microstructures and Exceptional Mechanical Properties

• DOI: 10.1002/adma.202006946
• 发表时间: 2021-02
• 期刊: Advanced Materials
• 影响因子: 29.4
• 作者: A. Xin;Yipin Su;Shengwei Feng;M. Yan;Kunhao Yu;Zhangzhengrong Feng;Kyung Hoon Lee;Lizhi Sun;Qiming Wang

Molecular simulation-guided and physics-informed mechanistic modeling of multifunctional polymers

• DOI: 10.1007/s10409-021-01100-3
• 发表时间: 2021-05
• 期刊: Acta Mechanica Sinica
• 影响因子: 3.5
• 作者: Guang Chen;Weikang Xian;Qiming Wang;Ying Li

Mechanics of photosynthesis assisted polymer strengthening

• DOI: 10.1016/j.jmps.2021.104382
• 发表时间: 2021-03-04
• 期刊: JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
• 影响因子: 5.3
• 作者: Yu，Kunhao;Feng，Zhangzhengrong;Wang，Qiming
• 通讯作者: Wang，Qiming