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• W2026883071 startingPage "7423" @default.
• W2026883071 abstract "Novel hydrogels with excellent mechanical properties have prompted applications in biomedical and other fields. The reported tough hydrogels are usually fabricated by complicated chemical and/or physical methods. To develop more facile fabrication methods is very important for the practical applications of tough hydrogels. We report a very simple yet novel method for fabricating tough hydrogels that are totally physically cross-linked by cooperative hydrogen bonding between a pre-existing polymer and an in situ polymerized polymer. In this work, tough hydrogels are prepared by heating aqueous acrylamide (AAm) solution in the presence of poly(N-vinylpyrrolidone) (PVP) but without any chemical initiators or covalent bonding cross-linking agents. Mechanical tests of the as-prepared and swollen PVP-in situ-PAAm hydrogels show that they exhibit very high tensile strengths, high tensile extensibility, high compressive strengths, and low moduli. Comparative synthesis experiments, DSC characterization, and molecular modeling indicate that the formation of strong cooperative hydrogen bonding between the pre-existing PVP and the in situ formed PAAm chains contributes to the gel formation and the toughening of the hydrogels. The unique microstructure of the gels with evenly distributed flexible cross-linking sites and long polymer chains attached to them endow the hydrogels with an excellent mechanism of distributing the applied load." @default.
• W2026883071 created "2016-06-24" @default.
• W2026883071 creator A5026319956 @default.
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• W2026883071 creator A5074388251 @default.
• W2026883071 creator A5084778818 @default.
• W2026883071 date "2013-09-16" @default.
• W2026883071 modified "2023-10-17" @default.
• W2026883071 title "Facile Fabrication of Tough Hydrogels Physically Cross-Linked by Strong Cooperative Hydrogen Bonding" @default.
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• W2026883071 doi "https://doi.org/10.1021/ma401053c" @default.
• W2026883071 hasPublicationYear "2013" @default.
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