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Engineering hydrophobically associated hydrogels with rapid self‐recovery and tunable mechanical properties using metal‐ligand interactions
Author(s) -
Panda Prachishree,
Dutta Agniva,
Ganguly Debabrata,
Chattopadhyay Santanu,
Das Rajat K.
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49590
Subject(s) - self healing hydrogels , lability , copolymer , monomer , polymer chemistry , metal , ligand (biochemistry) , terpyridine , ultimate tensile strength , materials science , hydrophobic effect , acrylamide , chemical engineering , chemistry , polymer , composite material , organic chemistry , biochemistry , receptor , engineering
In this contribution, hydrophobic association and metal‐ligand coordination have been employed in a dual physical crosslinking strategy to access hydrogels based on micellar copolymerization of acrylamide and a hydrophobic acrylic monomer (containing terpyridine (terpy) for metal‐ligand interaction). The mechanical properties of these hydrogels are strongly influenced by the thermodynamic stability and kinetic lability of the metal‐terpy crosslinks present in these materials. While the hydrogel tensile strength and stability on water exposure are enhanced by choosing stronger Fe 2+ ‐terpy crosslinks, the weaker and more kinetically labile Zn 2+ ‐terpy coordination bonds enable significantly higher energy dissipation under tensile loading and self‐healing in the resultant hydrogels.