Meurer Josefine, Bätz Thomas, Hniopek Julian, Jäger Milena, Zechel Stefan, Schmitt Michael, Popp Jürgen, Hager Martin D, Schubert Ulrich S
Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldstr. 10, 07743 Jena, Germany.
Jena Center of Soft Matter (JCSM), Friedrich Schiller University Jena, Philosophenweg 7, 07743 Jena, Germany.
Polymers (Basel). 2022 Apr 29;14(9):1833. doi: 10.3390/polym14091833.
This study presents the synthesis and characterization of metallopolymer networks with a triple shape-memory ability. A covalently crosslinked polymer network featuring two different additional ligands in its side chains is synthesized via free radical polymerization (FRP). The subsequent addition of different metal salts leads to the selective formation of complexes with two different association constants (), proven via isothermal titration calorimetry (ITC). Those two supramolecular crosslinks feature different activation temperatures and can act as two individual switching units enabling the fixation and recovery of two temporary shapes. The presented samples were investigated in a detailed fashion via differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and FT-Raman spectroscopy. Furthermore, thermo-mechanical analyses (TMA) revealed excellent dual and triple shape-memory abilities of the presented metallopolymer networks.
本研究展示了具有三重形状记忆能力的金属聚合物网络的合成与表征。通过自由基聚合（FRP）合成了一种在其侧链中具有两种不同附加配体的共价交联聚合物网络。随后添加不同的金属盐会导致形成具有两种不同缔合常数（通过等温滴定量热法（ITC）证实）的配合物。这两种超分子交联具有不同的活化温度，并且可以作为两个独立的开关单元，实现两种临时形状的固定和恢复。通过差示扫描量热法（DSC）、热重分析（TGA）和傅里叶变换拉曼光谱对所呈现的样品进行了详细研究。此外，热机械分析（TMA）揭示了所呈现的金属聚合物网络具有出色的双重和三重形状记忆能力。
