Characterization of strain recovery and "self-healing" in a self-assembled metallo-gel

We report a self-assembled metallo suprapolymer gel exhibiting remarkable self-healing features. The Ni 2 BTC metallo suprapolymer gels result from the complexation of Ni 2+ metal ions by a tritopic ligand (bis-terpyridine cyclam) in dimethylformamide (DMF) and an annealing step at 50 °C for 24 hour...

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Published inPhysical chemistry chemical physics : PCCP Vol. 15; no. 19; pp. 7338 - 7344
Main Authors Terech, Pierre, Yan, Minhao, Maréchal, Manuel, Royal, Guy, Galvez, Jose, Velu, Sabareesh K. P
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 01.01.2013
Subjects
Annealing
Applied sciences
Chemical Sciences
Exact sciences and technology
Fatigue (materials)
Impedance spectroscopy
Metallography
Networks
Physical properties
Polymer industry, paints, wood
Properties and testing
Recovery
Rheological properties
Strain
Technology of polymers
Characterization
Self assembly
Polymer gels
Physical properties
Nickel ion
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Summary:We report a self-assembled metallo suprapolymer gel exhibiting remarkable self-healing features. The Ni 2 BTC metallo suprapolymer gels result from the complexation of Ni 2+ metal ions by a tritopic ligand (bis-terpyridine cyclam) in dimethylformamide (DMF) and an annealing step at 50 °C for 24 hours. The self-healing properties are characterized by visual inspection, rheological and impedance spectroscopy measurements: the results are compared with those of a fatty acid-based molecular organogel chosen as a reference system. The creep-recovery analysis uses the Burgers model for low strains and characterizes a recovery capability of up to 72% of the deformation in Ni 2 BTC gels while it is only 32% for the fatty acid organogel. At very large strains, the impedance spectroscopy confirms the slow repairing process consistently with the visual observations. Rheological measurements demonstrate the restructuring of the fractured networks. The fatigue of the self-healed gel networks undergoing long sequences of strain-relaxation steps is characterized. The characterization of self-healing and strain recovery in a self-assembled metallo supramolecular gel based on the complexation of Ni 2+ ions by a tritopic ligand is reported.
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ISSN:1463-9076
1463-9084
DOI:10.1039/c3cp50671a