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Energy Dissipation and Mullins Effect of Tough Polymer/Graphene Oxide Hybrid Nanocomposite Hydrogels

Abstract

Nanocomposite hydrogels (NC gels) are considered as one of high strength hydrogels. Graphene oxide (GO), thanks to its amphiphilic, mechanical, optical property, is widely used as fillers to incorporate into different hosting materials (elastomers, plastics, and hydrogels) to improve their mechanical properties. In this work, we used in situ free radical polymerization to synthesize polyacrylamide (PAAm)/GO hybrid NC gels in the presence of GO nanosheets and a very small amount of chemical crosslinkers (N, N'-methylenebisacryamide, MBA<0.1 mol%). By optimizing GO and MBA concentrations, the resulting PAAm/GO gels can achieve elastic modulus of 66 kPa, fracture stress of 0.27 MPa, fracture strain of 13.76 mm/mm, deformed energy of 2.52 MJ/m3, and tearing energy of 964 J/m2. Due to the presence of physical interactions between PAAm and GO nanosheets, PAAm/GO gels demonstrated λ-dependent energy dissipation and Mullins self-recovery behaviors. The gels can rapidly recover their stiffness and toughness by 76% and 60%, respectively after 30 min. resting at room temperature. The possible toughening mechanisms and Mullins effect of PAAm/GO gels were proposed and compared with those of filler rubbers and other high strength hydrogels. This work provides new viewpoints to develop tough hydrogels by introduction of GO into other hydrogels with a good mechanical balance between strong chemical bonding and reversible physical bonding.

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Publication details

The article was received on 25 Jun 2017, accepted on 11 Jul 2017 and first published on 12 Jul 2017


Article type: Paper
DOI: 10.1039/C7PY01068K
Citation: Polym. Chem., 2017, Accepted Manuscript
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    Energy Dissipation and Mullins Effect of Tough Polymer/Graphene Oxide Hybrid Nanocomposite Hydrogels

    Z. Tang, F. Chen, Q. Chen, L. Zhu, X. Yan, H. Chen, B. Ren, J. Yang, G. Qin and J. Zheng, Polym. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7PY01068K

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