Photocontrolled Molecular Recognition for Materials Applications

材料应用的光控分子识别

• 批准号: 262028-2013
• 负责人: Wisner, James
• 金额: $ 2.48万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=571210
• 关键词: Photocontrolled; Molecular; Recognition; Materials; Applications

The proposal describes the development of new molecules that interact with each other in a reversible manner to form "smart" materials that react to the application of external stimuli by changing their physical properties in useful ways. The long term goals of our research in this area are; 1) the creation of particular polymer (plastics, rubbers) materials properties through rational changes to the underlying molecular designs that compose them, 2) the use of particular stimuli to control the materials properties in defined ways - specifically in this proposal we intend to use light and heat to reversibly induce changes (e.g. switching from a solid to viscous liquid and back again) in the properties of the materials we make, 3) developing ways to achieve 1) and 2) both simply and inexpensively. These long term goals are addressed in this proposal through the planned development of hydrogen bond arrays that use the underlying skeleton of a class of known bis(heteroaryl)azo dyes in a unique way. We have found that these dyes form reversible complexes with new complementary molecules we have designed in a manner analogous to sequence-specific pairing of the nucleobases in the DNA double helix. Subjecting these systems to irradiation with UV light induces a change in the topology of the bis(heteroaryl)azo dyes and renders them less able (or unable) to interact with their complementary partners. This change in their arrangement causes the two molecules to dissociate and will ultimately alter the cohesion of any material that they are responsible, largely or in part, for holding together. We plan on using this phenomenon to create new polymer materials that exhibit properties such as: 1) Phototunable stiffness/elasticity/processability, 2) Photocontrollable self-healing ability. The proposed research is anticipated to add significantly to the catalogue of methods that may be used to control the properties of materials such as plastics and rubbers. The research outlined here will also aid in training chemists in a wide range of skills useful in both academic and industrial careers.

该提案描述了新分子的发展，这些分子以可逆的方式相互作用，形成“智能”材料，通过以有用的方式改变其物理特性来对外部刺激的应用做出反应。 我们在这方面的研究的长期目标是：1）特定聚合物的生成（塑料，橡胶）材料的性质，通过合理的变化，以基本的分子设计，组成他们，2）使用特定的刺激以限定的方式控制材料特性-特别是在本提案中，我们打算使用光和热来可逆地诱导变化（例如从固体到粘性液体的转换）我们制造的材料的性质，3）开发方法来实现1）和2）既简单又便宜。 这些长期的目标是解决在这个建议，通过有计划的开发氢键阵列，使用一类已知的双（杂芳基）偶氮染料的基础骨架在一个独特的方式。 我们发现这些染料与我们设计的新互补分子形成可逆复合物，其方式类似于DNA双螺旋中核碱基的序列特异性配对。 使这些系统经受UV光照射诱导双（杂芳基）偶氮染料的拓扑结构的变化，并使它们不太能够（或不能）与它们的互补伙伴相互作用。 这种排列的变化导致两个分子解离，并最终改变它们所负责的任何材料的凝聚力，大部分或部分，保持在一起。 我们计划利用这一现象来创造新的聚合物材料，这些材料具有以下特性：1）光可调刚度/弹性/可加工性，2）光可控自愈能力。 预计拟议的研究将大大增加可用于控制塑料和橡胶等材料性能的方法目录。 这里概述的研究也将有助于培养化学家在学术和工业生涯中有用的广泛技能。