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Self-Healable Thermoplastic Copolymers

自修复热塑性共聚物

基本信息

批准号：
2003005
负责人：
Marek Urban
金额：
$ 62.19万
依托单位：
Clemson University
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：
2020-06-01 至 2025-05-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2003005&HistoricalAwards=false
关键词：
Self Healable Thermoplastic Copolymers

项目摘要

PART 1: NON-TECHNICAL SUMMARYSelf-healing is the capability of a material to recover from physical damage. This research aims at advancing our limited knowledge on the design and development of commodity polymers that exhibit self-healing properties. An ultimate goal is the development of new generation of inexpensive polymeric materials that are capable of autonomous self-healing. The planned research will impact fields of polymer and materials science, polymer engineering and processing, as well as technologically related fields. It is envisioned that existing polymers and devices made out of these materials will last longer while sustaining useful functions. The significance and importance of the proposed research lies in numerous critical applications of low-cost materials in the energy, healthcare, and homeland security sectors, all of which are vital to US global competitiveness. This project will develop scientific protocols on how to design polymeric materials with sustainable and useful functions by imbedded self-healing properties. These studies will involve design and preparation of thermoplastic commodity polymers that are capable of self-healing. Such prepared materials will be tested for mechanical and chemical integrity during damage-repair cycles in the presence and absence of water. The output of the tests will be used to perform computer simulations in an effort to understand underlying processes of self-healing. Through the integration of research and education, a new generation of diversified graduate students who will become productive members of society will be educated. This training will include addressing fundamental scientific questions on how commodity plastics can be equipped with self-healing functions so they become sustainable and minimize waste plastics accumulation. PART 2: TECHNICAL SUMMARYThe goal of the project is to equip commodity copolymers with self-healing properties which will be accomplished by understanding the role of copolymer compositional and structural dependences on self-healing. The proposed studies are organized into two interactive research areas: 1) copolymerization of self-healing methacrylate/acrylate-based fluoro-containing copolymers and 2) elucidating the origin of molecular level processes that govern self-healing in the presence of hydrophobic and hydrophilic environments under hydrostatic pressures. An ultimate scientific objective will be to elucidate the origin and the strength of van der Waals (vdW) interactions on the efficiency of self-healing. To accomplish these objectives a series of commodity monomers with variable monomer molar ratios will be copolymerized. They include but are not be limited to 2,2,2-trifluoroethyl methacrylate (TFEMA), 1,1,1,3,3,3-hexafluoroisopropyl methacrylate (HFIPMA), 2,2,3,3,4,4,4-heptafluorobutyl methacrylate (HFBMA), 2,2,2-trifluoroethyl methacrylate (TFEMA), 1,1,1,3,3,3-hexafluoroisopropyl methacrylate/hexyl acrylate) (HFIPMA), and 2,2,3,3,4,4,4-heptafluorobutyl methacrylate (HFBMA) copolymerized with acrylic-based monomers (n-butyl, n-pentyl, and n-hexyl acrylates) to from self-healable films. Using molecular level spectroscopic (NMR, ESR, IR, Raman) and macroscopic probes (optical microscopy, tensile and dynamic mechanical measurements) supported by molecular dynamic (MD) simulations, an ultimate goal is to develop a new generation of self-healable commodity copolymers and understand molecular origins of self-healing behavior..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.

第一部分：非技术总结自我修复是材料从物理损伤中恢复的能力。这项研究旨在推进我们有限的知识，商品聚合物的设计和开发，表现出自我修复的性能。最终目标是开发能够自主自我修复的新一代廉价聚合物材料。计划中的研究将影响聚合物和材料科学、聚合物工程和加工以及技术相关领域。据设想，由这些材料制成的现有聚合物和装置将持续更长时间，同时维持有用的功能。拟议研究的意义和重要性在于低成本材料在能源，医疗保健和国土安全部门的众多关键应用，所有这些都对美国的全球竞争力至关重要。该项目将开发关于如何设计具有可持续和有用功能的聚合物材料的科学协议。这些研究将涉及能够自我修复的热塑性商品聚合物的设计和制备。在有水和无水的情况下，将在损坏修复周期期间对这些准备好的材料进行机械和化学完整性测试。测试的结果将用于进行计算机模拟，以了解自我修复的基本过程。通过研究和教育的整合，将培养新一代多样化的研究生，他们将成为社会的生产成员。该培训将包括解决基本的科学问题，即如何使商品塑料具有自我修复功能，使其具有可持续性，并最大限度地减少废塑料的积累。第二部分：该项目的目标是使商品共聚物具有自修复性能，这将通过理解共聚物组成和结构对自修复的依赖性来实现。拟议的研究分为两个互动的研究领域：1）自愈合的甲基丙烯酸酯/丙烯酸酯基含氟共聚物的共聚和2）阐明的起源的分子水平的过程，管理在疏水性和亲水性环境下的静水压力下的自愈合。最终的科学目标将是阐明货车德瓦尔斯（vdW）相互作用的起源和强度对自我修复的效率。为了实现这些目标，将共聚一系列具有可变单体摩尔比的商品单体。它们包括但不限于甲基丙烯酸2，2，2-三氟乙酯（TFEMA）、甲基丙烯酸1，1，1，3，3，3-六氟异丙酯（HFIPMA）、甲基丙烯酸2，2，3，3，4，4-七氟丁酯（HFBMA）、甲基丙烯酸2，2，2-三氟乙酯（TFEMA）、甲基丙烯酸1，1，1，3，3，3-六氟异丙酯/丙烯酸己酯（HFIPMA）和甲基丙烯酸2，2，3，3，4，4，甲基丙烯酸4-七氟丁酯（HFBMA）与丙烯酸类单体（丙烯酸正丁酯、丙烯酸正戊酯和丙烯酸正己酯）共聚以形成可自愈合的膜。使用分子水平的光谱（NMR、ESR、IR、拉曼）和宏观探针（光学显微镜、拉伸和动态力学测量），并由分子动力学（MD）模拟支持，最终目标是开发新一代可自修复的商品共聚物，并了解自修复行为的分子起源。该奖项反映了NSF的法定使命，并被认为是值得通过使用基金会的知识价值和更广泛的影响审查标准进行评估的支持。