Mechanochemical and supramolecular self-healing polymers

机械化学和超分子自修复聚合物

• 批准号: 201036165
• 负责人: Professor Dr. Wolfgang Binder
• 金额: --
• 依托单位: Arbeitsbereich Technische Chemie und Makromolekulare Chemie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/201036165?language=en
• 关键词: Mechanochemical; supramolecular; self; healing; polymers

The current project will address the generation of a self-healing system by combination of two principles of self-healing via encapsulation principles, thus generating self-healing polymers with more than one “self-healing-cycle”. Capsules filled with either a multivalent azide/alkyne-polymer will form the "one-healing-cycle" system, whereas a second (supramolecular) healing system will form the basis for multiple healing cycles within the material. The latter principle will be based on two hydrogen bonding systems, one with a relatively long lifetime of association/dissociation (Hamilton-receptor/barbituric acid), the other displaying a short lifetime of association/dissociation (2,6-diaminotriazine/thymine). Both healing principles will rely on liquid polymers bearing multiple (reactive or associative) functional moieties on their chain-ends. Thus multiarm-star-, dendritic- and graft-polymers will be used as encapsulated (polymeric) reagents, with a glass transition-temperature (Tg) significantly below room temperature, so as to retain their liquid flow behavior at room temperature and below. Two main polymers are projected to this purpose: (a) polyisobutylenes (Tg ~ (-70°C)) and (b) copolymers of (oxy)norbornenes with butadiene (Tg ~ (- 90 °C)). Multivalency of all interacting or reactive groups is needed in order to increase the crosslinking density and thus the final mechanical strength of the "healed" material. The presented concept will be extended towards the visualization of crack-formation based on multivalent (alkyne) bearing-polymer and "fluorogenic" dyes that will allow the (visual) detection of the position of mechanical crack-formation via confocal laser microscopy.

当前的项目将通过封装原理结合两种自修复原理来解决自修复系统的生成问题，从而生成具有多个“自修复循环”的自修复聚合物。填充多价叠氮化物/炔烃聚合物的胶囊将形成“单愈合循环”系统，而第二种（超分子）愈合系统将形成材料内多个愈合循环的基础。后一种原理将基于两个氢键系统，一个具有相对较长的缔合/解离寿命（汉密尔顿受体/巴比妥酸），另一个则表现出较短的缔合/解离寿命（2,6-二氨基三嗪/胸腺嘧啶）。两种治疗原理都依赖于链端带有多个（反应性或缔合性）功能部分的液体聚合物。因此，多臂星形、树枝状和接枝聚合物将用作封装（聚合）试剂，其玻璃化转变温度（Tg）显着低于室温，以便在室温及以下温度下保持其液体流动行为。预计将有两种主要聚合物用于此目的：(a) 聚异丁烯 (Tg ~ (-70°C)) 和 (b) (氧基)降冰片烯与丁二烯的共聚物 (Tg ~ (-90°C))。为了增加交联密度并因此增加“愈合”材料的最终机械强度，需要所有相互作用或反应性基团的多价性。所提出的概念将扩展到基于多价（炔）轴承聚合物和“荧光”染料的裂纹形成的可视化，这将允许通过共焦激光显微镜（视觉）检测机械裂纹形成的位置。