Shape‐memory metallopolymers based on two orthogonal metal–ligand interactions

GND
1214891268
Affiliation
Friedrich Schiller University Jena
Meurer, Josefine;
GND
1214890598
ORCID
0000-0002-8652-8812
Affiliation
Friedrich Schiller University Jena
Hniopek, Julian;
Affiliation
Friedrich Schiller University Jena
Bätz, Thomas;
Affiliation
Friedrich Schiller University Jena
Zechel, Stefan;
GND
121489139X
Affiliation
Friedrich Schiller University Jena
Enke, Marcel;
GND
129435406
ORCID
0000-0001-8640-4898
Affiliation
Friedrich Schiller University Jena
Vitz, Jürgen;
GND
120748193
ORCID
0000-0002-3807-3630
Affiliation
Friedrich Schiller University Jena
Schmitt, Michael;
GND
131701819
Affiliation
Friedrich Schiller University Jena
Popp, Jürgen;
GND
134002695
ORCID
0000-0002-6373-6600
Affiliation
Friedrich Schiller University Jena
Hager, Martin D.;
GND
113792077
ORCID
0000-0003-4978-4670
Affiliation
Friedrich Schiller University Jena
Schubert, Ulrich S.

A new shape‐memory polymer is presented, in which both the stable phase as well as the switching unit consist of two different metal complexes. Suitable metal ions, which simultaneously form labile complexes with histidine and stable ones with terpyridine ligands, are identified via isothermal titration calorimetry (ITC) measurements. Different copolymers are synthesized, which contain butyl methacrylate as the main monomer and the metal‐binding ligands in the side chains. Zn(TFMS) 2 and NiCl 2 are utilized for the dual crosslinking, resulting in the formation of metallopolymer networks. The switching temperature can simply be tuned by changing the composition as well as by the choice of the metal ion. Strain fixity rates (about 99%) and very high strain recovery rates (up to 95%) are achieved and the mechanism is revealed using different techniques such as Raman spectroscopy.

The synthesis and characterization of shape‐memory metallopolymers based on orthogonal supramolecular interactions are presented; i.e., two different metal complexes. By a cyclo mechanic test, the structure–property relationship is studied, and a strong correlation between the switching temperature, which ranges in this case from 85 to 115 °C, and the structural parameters is achieved. image

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