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Issue 2, 2019
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High strength of hybrid double-network hydrogels imparted by inter-network ionic bonds

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Abstract

Interaction between networks has been proven to be of importance for mechanical property enhancement of double-network (DN) hydrogels. In this work, inter-network ionically cross-linked hybrid DN hydrogels have been prepared using poly(sodium 2-acrylamide-2-methylpropanesulfonate) (PNaAMPS) as the first network, and a co-polymer of a cationic monomer and acrylamide (AM) as the second network. Ionic complexes were formed between the two oppositely charged networks after dialyzing the hydrogels in water. Near the ion-balance point, hybrid DN hydrogels with enhanced strengths were achieved compared to the unmodified PNaAMPS/polyacrylamide (PAM) DN hydrogel. Synchrotron radiation small-angle X-ray scattering (SAXS) analyses were performed on the DN hydrogels. It was found that large and compact cross-linked domains were formed in the hybrid DN hydrogels, especially near the ion-balance point, as demonstrated by the SAXS results. These large and compact cross-linked domains, which indicate enhanced interactions between networks containing ionic bonds besides physical entanglements, dissipate additional concentrated stress, resulting in high strength of the hybrid DN hydrogels.

Graphical abstract: High strength of hybrid double-network hydrogels imparted by inter-network ionic bonds

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Publication details

The article was received on 24 Oct 2018, accepted on 07 Dec 2018 and first published on 14 Dec 2018


Article type: Paper
DOI: 10.1039/C8TB02803F
Citation: J. Mater. Chem. B, 2019,7, 324-333
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    High strength of hybrid double-network hydrogels imparted by inter-network ionic bonds

    X. Zhao, J. Liang, G. Shan and P. Pan, J. Mater. Chem. B, 2019, 7, 324
    DOI: 10.1039/C8TB02803F

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