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Double network hydrogels based on semi-rigid polyelectrolyte physical networks

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Title: Double network hydrogels based on semi-rigid polyelectrolyte physical networks
Authors: Takahashi, Riku Browse this author
Ikai, Takuma Browse this author
Kurokawa, Takayuki Browse this author →KAKEN DB
King, Daniel Rudolf Browse this author
Gong, Jian Ping Browse this author →KAKEN DB
Keywords: Hydrogels
Semi-rigid polymers
Composite materials
Double network gels
Tunable mechanical properties
Issue Date: 9-Nov-2020
Publisher: Royal Society of Chemistry
Journal Title: Journal of materials chemistry B, Materials for biology and medicine
Volume: 7
Issue: 41
Start Page: 6347
End Page: 6354
Publisher DOI: 10.1039/C9TB01217F
PMID: 31642851
Abstract: Applying the double network principle to develop tough hydrogels with different polymer chemistries is important for the potential application of hydrogel materials. Synthesis of the two interpenetrated networks with contrasting structure and properties required for double networks usually involves a two-step polymerization process. In this work, we present a new method to synthesize tough double network hydrogels by post-physical crosslinking of linear semi-rigid polyelectrolytes entrapped in a chemically crosslinked neutral network. Owing to their semi-rigid structure, the linear polyelectrolytes form a brittle physical network above their overlap concentration in multi-valent ZrCl2O ion solutions without macroscopic phase separation within the flexible neutral network. The double network hydrogels thus prepared exhibit high modulus (~1.7 MPa), strength (~1.3 MPa), fracture strain (~7.3), and strain energy density (~5.9 MJ/m3), while containing over 80% water. These materials also exhibit modest self-healing ability (~51% after 30 minutes), demonstrating an additional benefit of a physical sacrificial network. This method is simpler than the conventional two-step polymerization and could be applied to develop tough hydrogels from rigid polyelectrolytes, including biopolymers such as DNA, HA, and chondroitin sulfate.
Type: article (author version)
Appears in Collections:国際連携研究教育局 : GI-CoRE (Global Institution for Collaborative Research and Education : GI-CoRE) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 龔 剣萍 (Gong Jian Ping)

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