Improved Moisture Barrier Performance in Poly(vinylidene chloride) Film by Controlling Hydrophobicity of Graphene Oxide

초록

The alkylated graphene oxide (AGO) was synthesized by S(N)2 reaction between graphene oxide and octylamine, and its dispersion stability in tetrahydrofuran (THF) and thermodynamic compatibility with poly(vinylidene chloride) (PVDC) were analyzed. AGO was compounded with PVDC, which is the most representative polymer with gas barrier properties, as a solution to improve the water barrier properties of the PVDC matrix film. The degree of alkylation of the mixture (similar to 31 wt%) was characterized and calculated through Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis. The dispersion stability of AGO in THF, which is a good solvent for PVDC, was quantified by light scattering, operating in transmittance mode for 3 days. Alkylation lowered the delta transmittance of the dispersion from 72% to 0.17%. The hydrophobic character of AGO, in comparison with that of GO and PVDC films, was confirmed through contact angle measurements. The inclusion of AGO in the PVDC matrix film improved its water transmission rate from 1.7 to 0.2 g/(m(2) day). Based on the experimental data, the water barrier mechanism in AGO/PVDC nanocomposite films is herein suggested.

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