Abstract
The exfoliated graphene oxides (GOs) prepared via the Hummer’s method were well dispersed in water but re-stacked if drying to a powder form as observed by transmission electron microscope and x-ray diffraction pattern. Hence, they were directly mixed with poly(vinyl alchohol) (PVA) in water to fabricate the PVA/GO nanocomposite films by casting the resulting aqueous solutions and drying. As the nanocomposite films with no less than 5 wt% GO content were subjected to combustion, the char residue could preserve their original film profile acting like an inflammable scaffold. The glassy transition temperature of as-fabricated PVA/GO nanocomposite films barely changed with the content of GO but significantly decreased from ~70 to ~10 °C as environmental relative humidity (RH) was increased from 20 to 80 % due to more moisture adsorption. Therefore, the mechanical behavior of PVA/GO nanocomposite films not only depended on the GO content but also RH, exhibiting from rubbery to glassy status.
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The authors acknowledge the financial support of the National Science Council in Taiwan, Republic of China, through Grant NSC 101-2221-E-002-049- MY3.
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Lin, KJ., Lee, SC. & Lin, KF. One-pot fabrication of poly(vinyl alcohol)/graphene oxide nanocomposite films and their humidity dependence of mechanical properties. J Polym Res 21, 611 (2014). https://doi.org/10.1007/s10965-014-0611-4
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DOI: https://doi.org/10.1007/s10965-014-0611-4