Preparation of PVA-GO Composite Hydrogel and Effect of Ionic Coordination on Its Properties

dc.contributor.authorWu, Xiaofang
dc.contributor.authorXie, Yingying
dc.contributor.authorXue, Chao
dc.contributor.authorChen, Kai
dc.contributor.authorYang, Xuehui
dc.contributor.authorXu, Linmin
dc.contributor.authorQi, Jianwei
dc.contributor.authorZhang, Dekun
dc.contributor.departmentMechanical and Energy Engineering, School of Engineering and Technologyen_US
dc.date.accessioned2020-07-10T20:46:25Z
dc.date.available2020-07-10T20:46:25Z
dc.date.issued2020-07
dc.description.abstractThis paper adopts a method combining hybrid self-assembly, cyclic freezing-thawing and annealing treatment to prepare polyvinyl alcohol (PVA) and graphene oxide (GO) composite hydrogel. Then, the PVA-GO composite hydrogels are re-swelled in different ionic solutions (NaCl, MgCl2, CaCl2 and AlCl3) to improve mechanical strength, toughness and wear resistance by the ionic coordination bonds. The microstructure and morphology are characterized by Fourier transforms infrared spectroscopy (FTIR), x-ray diffraction (XRD) and Scanning electron microscopy (SEM), finding that the internal structure is porous three-dimensional network. Mechanical experiments indicate that the composite hydrogel with GO content of 0.05 wt% immersed in MgCl2 solution displays the best mechanical properties overall. Its tensile strength can reach 11.10 MPa and the elastic modulus reaches 1.72 MPa, which is 175% and 85% higher than the pure PVA, respectively. Sliding friction experiments illustrate that the composite hydrogel immersed in AlCl3 solution exhibits the lowest friction coefficient, and the higher the valence state of metal cation is, the better the wear reduction effect is. We expect to enrich the development of PVA-GO hydrogels in tissue engineering through synergy of hydrogen bonds and ionic coordination bonds.en_US
dc.eprint.versionAuthor's manuscripten_US
dc.identifier.citationWu, X., Xie, Y., Xue, C., Chen, K., Yang, X., Xu, L., ... & Zhang, D. (2019). Preparation of PVA-GO composite hydrogel and effect of ionic coordination on its properties. Materials Research Express, 6(7), 075306. https://doi.org/10.1088/2053-1591/ab11eeen_US
dc.identifier.urihttps://hdl.handle.net/1805/23218
dc.language.isoenen_US
dc.publisherIOPen_US
dc.relation.isversionof10.1088/2053-1591/ab11eeen_US
dc.relation.journalMaterials Research Expressen_US
dc.rightsPublisher Policyen_US
dc.sourceAuthoren_US
dc.subjectgraphene oxideen_US
dc.subjectcomposite hydrogelen_US
dc.subjectionic coordination bondsen_US
dc.titlePreparation of PVA-GO Composite Hydrogel and Effect of Ionic Coordination on Its Propertiesen_US
dc.typeArticleen_US
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