▎ 摘　　要

Association of a method of the incorporation of graphene oxide (GO) into sodium alginate (Na-alg) polymer matrix with a method of the use multivalent cations crosslinker was put forward to synthesize novel Na-alg/GO nanocomposite films. The structures, morphologies, and the properties of Na-alg/GO films were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), thermogravimetric analysis (TGA), and tensile tests. The results revealed that the interlayer distance of GO sheets increased from 0.83 nm to 1.08 nm after assembling with Na-alg, and Na-alg inserted into GO layers crosslinking with multivalent cations increased the interlayer distance further. Ionic crosslinking significantly enhanced thermal and mechanical properties of Na-alg/GO nanocomposite films. In particular, Fe3+ led to Na-alg/GO nanocomposite films of significantly higher tensile strength and modulus than Ca2+ and Ba2+. The excellent thermal and mechanical properties of these novel Na-alg/GO nanocomposite films may open up applications for Na-alg films. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43616.