Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (7): 767-775.DOI: 10.11944/j.issn.1000-0518.2018.07.170273

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Influence of Graphene Oxide on the Rheological Properties of Poly(vinyl alcohol)/Borate Hydrogel

Gang HUANGab,Hongwei ZHANGc,Huanhuan ZHANGab,Tongfei SHIa,Donghua XUa*()   

  1. aState Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
    bGraduate School of the Chinese Academy of Sciences,Beijing 100039,China
    cDepartment of Food Science,Rutgers,The State University of New Jersey,65 Dudley Road,New Brunswick,NJ 08901,USA
  • Received:2017-08-08 Accepted:2017-09-22 Online:2018-07-06 Published:2018-07-06
  • Contact: Donghua XU
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21274152)

Abstract:

The influence of graphene oxide(GO) on the linear and nonlinear rheological properties of poly(vinyl alcohol)(PVA)/borate hydrogel was explored in this work. Results of scanning electron microscopy, 11B nuclear magnetic resonance and rheology reveal that elastically active points formed between dispersed GO sheets and PVA chains have enhanced plateau modulus(G0), relaxation time(τ) and zero shear viscosity(η0) of samples when the mass concentration of GO(ρ(GO)) is in the dilute concentration regime. As ρ(GO) is further increased to the semi-dilute concentration regime, part of cross-linkers is occupied by GO aggregation and exists as non-elastically active GO-borate-GO bond, then G0, τ and η0 of samples are decreased with ρ(GO). Under steady shear, the enhancement of viscosity in shear thickening regime always increases with ρ(GO) in different concentration regimes, which is related with the participation of oriented GO sheets to reorganization of the network.

Key words: poly(vinyl alcohol)/borate hydrogel, grapheme oxide, shear thickening, rheology