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Fabrication of Tough Hydrogel Composites from Photoresponsive Polymers to Show Double-Network Effect

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ACS Appl. Mater. Interfaces11-40_37139-37146.pdf2.89 MBPDFView/Open
Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/79501

Title: Fabrication of Tough Hydrogel Composites from Photoresponsive Polymers to Show Double-Network Effect
Authors: Tao, Zhen Browse this author
Fan, Hailong Browse this author
Huang, Junchao Browse this author
Sun, Taolin Browse this author
Kurokawa, Takayuki Browse this author
Gong, Jian Ping Browse this author →KAKEN DB
Keywords: photoresponsive
tough hydrogels
hydrogel composites
DN hydrogel
toughening mechanism
sandwich structure
Issue Date: 9-Oct-2019
Publisher: American Chemical Society(ACS)
Journal Title: ACS Applied Materials & Interfaces
Volume: 11
Issue: 40
Start Page: 37139
End Page: 37146
Publisher DOI: 10.1021/acsami.9b13746
Abstract: Inspired by the toughening mechanism of double-network (DN) gels, tough hydrogel composites with a sandwich structure were fabricated from photoresponsive polymers. By copolymerization of hydrophilic monomers, 2-ureidoethyl methacrylate (UM), and photoresponsive hydrophobic monomers, (2-nitrobenzyloxycarbonylaminoethyl methacrylate (NBOC)) at high concentrations, physical hydrogels that are soft and highly stretchable are formed due to the hydrophobic associations of NBOC, serving as dynamic crosslinkers. By UV irradiation, the physical crosslinking switches into chemical crosslinking, and the soft physical hydrogels transform into rigid and less stretchable chemical hydrogels. By UV curing the surface layers of the physical hydrogels, we prepared hydrogel composites having a sandwiched structure with two rigid outer layers and a soft inner layer. The molecular-level continuous interfaces and matched swelling ratios between the layers ensure the macroscale hydrogel composites’ high strength and toughness with a DN gel effect. The outer layers fracture preferentially at deformation, playing a role like the first network of a DN gel, while the inner layer maintains the integrity, playing a role resembling the second network. The evolution of the fracture morphology of the rigid layers gives useful insight into the internal fracture process of DN gels.
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS applied materials & interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acsami.9b13746.
Type: article (author version)
URI: http://hdl.handle.net/2115/79501
Appears in Collections:生命科学院・先端生命科学研究院 (Graduate School of Life Science / Faculty of Advanced Life Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 龔 剣萍 (Gong Jian Ping)

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