New insights into the mechanical and self-healing properties of polymers cross-linked by Fe( iii )-2,6-pyridinedicarboxamide coordination complexes

In order to understand the mechanical and self-healing properties of polymers cross-linked by Fe( iii )-2,6-pyridinedicarboxamide (pdca) coordination complexes, herein we performed the reaction between 2,6-pyridinedicarboxamide and FeCl 3 under both neutral and alkaline conditions, and studied the d...

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Bibliographic Details
Published in:Polymer chemistry 2019-01, Vol.10 (3), p.362-371
Main Authors: Mo, Sheng-Ran, Lai, Jian-Cheng, Zeng, Ke-Yu, Wang, Da-Peng, Li, Cheng-Hui, Zuo, Jing-Lin
Format: Article
Language:English
Subjects:
Bond strength
Bonding strength
Butadiene
Coordination compounds
Crosslinking
Exchanging
Ferric chloride
Iron chlorides
Ligands
Polymer chemistry
Polymers
Properties (attributes)
Self healing materials
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Summary:In order to understand the mechanical and self-healing properties of polymers cross-linked by Fe( iii )-2,6-pyridinedicarboxamide (pdca) coordination complexes, herein we performed the reaction between 2,6-pyridinedicarboxamide and FeCl 3 under both neutral and alkaline conditions, and studied the dynamic ligand exchange properties of the resulting model complexes. The results showed that [Fe(Hpdca)] + exhibited a rapid ligand exchange property which was not observed for [Fe(pdca)] − . Correspondingly, polymer Fe-Hpdca-PBCA (PBCA = poly(butadiene- co -acrylonitrile)) was weak, highly stretchable and self-healable, while Fe-pdca-PBCA was strong and poorly stretchable and can only be partially healed with a prolonged time. These results deliver a clear indication of the important impact of the bond strength and dynamics of coordination complexes on the mechanical and self-healing properties of polymers. Such an understanding is helpful for further design of novel synthetic polymers which can achieve an optimal balance between the mechanical strength and self-healing performance.
ISSN:1759-9954
1759-9962
DOI:10.1039/C8PY01233D