RUI: Metal-Coordination Crosslinked Polymer Networks as Elastomers

RUI：金属配位交联聚合物网络作为弹性体

• 批准号: 1505976
• 负责人: Alexander Schwab
• 金额: $ 29.99万
• 依托单位: Appalachian State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-06-01 至 2019-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1505976&HistoricalAwards=false
• 关键词: RUI; Metal; Coordination; Crosslinked; Polymer

NON-TECHNICAL SUMMARY:This research in a primarily undergraduate institution (RUI award) is focused on the development of a new type of polymeric rubber material which, unlike commercial rubber materials, would be recyclable. The chemistry used to make this new material also would allow for the rubbery properties to be turned on and off using electricity. The result of a successful project would be a material that could be converted from a liquid to a rubber at the flip of a switch. Additionally, these materials could be designed to display a color that indicates whether the material is rubbery or not. The color would change when the material has been chemically, electrically, or mechanically weakened to provide a visual warning that the material may not work as expected. This new class of materials could enable new technologies such as electrically controlled rubbers for use in advanced vibration/impact damping systems or in gaskets that change color when in need of replacement.Beyond potentially enabling new technologies, the pursuit of this research will allow for advanced research training of up to 20 undergraduate students over three years. It will also expand the materials research infrastructure at Appalachian State University, enabling faculty there to continue materials research for years to come. TECHNICAL SUMMARY:In this research project, 2,2'-bipyridine-terminated poly(dimethylsiloxane) (PDMS) chains will be synthesized and blended with various metal salts (e.g. iron (II) chloride) to create metal coordination complex crosslinked polymer networks (MC3PN)'s. These MC3PN's will subsequently be characterized with UV/Vis spectroscopy, cyclic voltammetry, differential scanning calorimetry, and dynamic mechanical analysis to better understand the relationship between the molecular structure and the resulting properties. In the course of the proposed research, the answers to the following five questions will be sought. 1) Is the metal-ligand binding sufficiently stable to serve as crosslinks and impart the MC3PN with elastomeric properties at room temperature? 2) Can altering the network structure (e.g. cross-link density) be used to tailor the mechanical properties of the elastomeric MC3PNs in the same manner that conventional covalently crosslinked elastomer properties (e.g. stiffness and strength) can be tailored? 3) Can the metal coordination complexes be reversibly and controllably un-crosslinked through the introduction of chelating ligands, redox processes, or a change in temperature? 4) Can the color imparted to the MC3PNs by the metal coordination complexes be used to ascertain the degree to which the material is crosslinked and from this to infer the mechanical properties (such as impending failure of the material)? 5) Can the self-assembly of metal coordination complexes impart self-healing properties to the elastomeric material?Beyond potentially enabling new technologies, the pursuit of this research will allow for advanced research training of up to 20 undergraduate students over three years. It will also expand the materials research infrastructure at Appalachian State University, enabling faculty there to continue materials research for years to come.

非技术性总结：这项主要在本科院校进行的研究（RUI奖）专注于开发一种新型聚合橡胶材料，与商业橡胶材料不同，这种材料是可回收的。用于制造这种新材料的化学物质也将允许使用电力打开和关闭橡胶特性。 一个成功的项目的结果将是一种材料，可以从液体转换为橡胶在一个开关的翻转。 此外，这些材料可以被设计成显示指示材料是否是橡胶状的颜色。 当材料在化学、电学或机械上被削弱时，颜色会发生变化，以提供材料可能无法按预期工作的视觉警告。 这类新材料可以使新技术成为可能，如电控橡胶用于先进的振动/冲击阻尼系统或需要更换时会变色的垫圈。除了可能使新技术成为可能之外，这项研究的追求将允许在三年内对多达20名本科生进行高级研究培训。 它还将扩大阿巴拉契亚州立大学的材料研究基础设施，使那里的教师能够在未来几年继续进行材料研究。 技术总结：在本研究项目中，将合成2，2 '-联吡啶封端的聚（二甲基硅氧烷）（PDMS）链，并与各种金属盐（例如氯化铁（II））共混，以创建金属配位络合物交联聚合物网络（MC 3 PN）。 这些MC 3 PN随后将用UV/维斯光谱、循环伏安法、差示扫描量热法和动态力学分析来表征，以更好地理解分子结构和所得性质之间的关系。 在拟议的研究过程中，将寻求以下五个问题的答案。1)金属-配体结合是否足够稳定以用作交联并赋予MC 3 PN在室温下的弹性体性质？ 2)改变网络结构（例如交联密度）是否可以用于以与常规共价交联的弹性体性质（例如刚度和强度）可以被定制相同的方式来定制弹性体MC 3 PN的机械性质？ 3)金属配位络合物可以通过引入螯合配体、氧化还原过程或温度变化可逆地和可控地去交联吗？4)金属配位化合物赋予MC 3 PN的颜色能否用于确定材料的交联程度，并由此推断机械性能（例如材料即将发生的失效）？ 5)金属配位络合物的自组装能赋予弹性体材料自修复性能吗？除了潜在的新技术，这项研究的追求将允许在三年内对多达20名本科生进行高级研究培训。 它还将扩大阿巴拉契亚州立大学的材料研究基础设施，使那里的教师能够在未来几年继续进行材料研究。