Metallopolymers as multifunctional and multistimuli-responsive shape-memory materials

金属聚合物作为多功能和多刺激响应形状记忆材料

• 批准号: 317854808
• 负责人: Professor Dr. Ulrich S. Schubert
• 金额: --
• 依托单位: Institut für Organische Chemie und Makromolekulare Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/317854808?language=en
• 关键词: Metallopolymers; multifunctional; multistimuli; responsive; shape

Shape-memory polymers are able to recover their original shape after preceded deformation. Upon an external trigger (e.g., heat) the polymer will return from the temporary shape into its initial shape. Metallopolymers are suitable candidates for the design of novel shape-memory polymers, which can be considered as the missing link between the established shape-memory polymers and shape memory alloys. Shape-memory metallopolymers are on-demand switchable shape-memory polymers. Due to the integrated supramolecular interaction (i.e. the metal-ligand-interaction) the reversibility (from low to high) as well as the suitable trigger (e.g., temperature, chemicals and redox reactions) can be tuned. Within the project, new metallopolymer networks with different metal ions (i.e. different potential triggers) and comonomers will be prepared. Within this context, two different processing methods will be utilized, i.e. reactive inkjet printing as well as copolymerization in bulk. The resulting metallopolymers will be investigated regarding their shape-memory behavior and the possibility to trigger the materials with different external stimuli like heat, light or chemicals. Furthermore, the influence of the chosen metal salt on the resulting properties as well as the addressability by the different stimuli will be studied in detail. This basic information will later be utilized for the design of novel triple-shape memory metallopolymers. For this purpose, two different types of metal complexes are required, which can be triggered independently from each other. Thus, one metal complex can be triggered to obtain a transition from the first temporary shape to the other one. Finally, the other metal complex will be addressed by the same stimulus at other conditions (e.g., higher temperature) or by the utilization of a complete different stimulus (e.g., heat and light) resulting in the final permanent shape. In another part of the project the self-healing ability of the shape-memory metallopolymers will be studied. In this context, the influence of the shape-memory behavior on the self-healing behavior will be studied and will also be compared to the classical self-healing metallopolymers. Thus, it will be investigated if there is a shape-memory assisted self-healing (SMASH). Finally, a completely new shape-memory behavior will be studied, which is the multiway triple shape-memory behavior. For this purpose, a metallopolymer with two independently addressable metal complexes is required. Furthermore, two different stimuli have to be utilized. In contrast to classical triple shape-memory polymers this new behavior offers the possibility to have two different temporary shapes after the applying of the first external stimulus depending on the order of the utilized stimulus. Thus, if light is applied first a completely different shape will be obtained. Finally, if the other stimulus is also used the permanent shape will be obtained.

形状内存聚合物能够在变形之前恢复其原始形状。在外部扳机（例如，热）上，聚合物将从临时形状返回其初始形状。金属聚合物是用于设计新型形状内存聚合物的合适候选物，可以将其视为已建立的形状 - 内存聚合物和形状内存合金之间缺失的联系。形状内存金属聚合物是按需切换形状 - 内存聚合物。由于超分子相互作用（即金属配体相互作用），可逆性（从低到高）以及合适的触发因素（例如温度，化学物质和氧化还原反应）。在该项目中，将准备具有不同金属离子（即不同的潜在触发器）和共同体器的新金属聚合物网络。在这种情况下，将利用两种不同的处理方法，即反应性喷墨打印以及批量共聚。将对产生的金属聚合物进行研究，以了解其形状记忆行为以及具有不同外部刺激（如热，光或化学物质）材料的可能性。此外，将详细研究所选金属盐对所得特性的影响以及不同刺激的处理性。此基本信息后来将用于设计新型的三形内存金属聚合物。为此，需要两种不同类型的金属配合物，可以彼此独立触发。因此，可以触发一种金属复合物以获得从第一个临时形状到另一个形状的过渡。最后，在其他条件下（例如较高温度）或使用完全不同的刺激（例如热量和光），将通过相同的刺激来解决另一个金属配合物，从而实现最终的永久形状。在项目的另一部分中，将研究形状内存金属聚合物的自我修复能力。在这种情况下，将研究形状记忆行为对自我修复行为的影响，也将与经典的自我修复金属聚合物进行比较。因此，如果存在形状内存的辅助自我修复（SMASH），将研究它。最后，将研究一种全新的形状记忆行为，即多路三重形状记忆行为。为此，需要具有两个具有独立寻址金属络合物的金属聚合物。此外，必须利用两种不同的刺激。与经典的三重形状内存聚合物相反，这种新行为可以根据使用的刺激的顺序在应用第一个外部刺激后具有两个不同的临时形状。因此，如果首先施加光，将获得完全不同的形状。最后，如果还使用了其他刺激，将获得永久形状。