Publication: Autonomic self-healing in covalently crosslinked hydrogels containing hydrophobic domains
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2013-11-01T00:00:00Z
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Tuncaboylu, Deniz C.
Argun, Aslihan
Algi, Melek Pamuk
Okay, Oğuz
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Abstract
Self-healing hydrogels suffer from low mechanical strength due to their reversible breakable bonds which may limit their use in any stress-bearing applications. This deficiency may be improved by creating a hybrid network composed of a combination of a physical network formed via reversible crosslinks and a covalent network. Here, we prepared a series of hybrid hydrogels by the micellar copolymerization of acrylamide with 2 mol % stearyl methacrylate (C18) as a physical crosslinker and various amounts of N,N--methylenebis(acrylamide) (BAAm) as a chemical crosslinker. Rheological measurements show that the dynamic reversible crosslinks consisting of hydrophobic associations surrounded by surfactant micelles are also effective within the covalent network of the hybrid hydrogels. A significant enhancement in the compressive mechanical properties of the hybrid gels was observed with increasing BAAm content. The existence of an autonomous self-healing process was also demonstrated in hybrid gels formed at low chemical crosslinker ratios. The largest self-healing efficiency in hybrids was observed in terms of the recovered elastic modulus, which was about 80% of the original value. (C) 2013 Elsevier Ltd. All rights reserved.
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Tuncaboylu D. C. , Argun A., Algi M. P. , Okay O., -Autonomic self-healing in covalently crosslinked hydrogels containing hydrophobic domains-, POLYMER, cilt.54, ss.6381-6388, 2013