Physicochemical properties of PAA-GO-Amylose nanocomposite hydrogel

In the present study, a nanocomposite hydrogel was synthesized based on poly (acrylic acid) grafted onto amylose (PAA-g-amylose) which was containing different loadings of graphene oxide (GO) nanosheets. The structural properties of optimized sample were characterized by scanning electron microscopy (SEM), X-ray analysis (XRD) and Fourier transform infrared spectroscopy (FTIR). The thermal behaviors of synthesized hydrogel were investigated by thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). XRD and scanning electron microscopy study demonstrates the formation of highly exfoliated GO layers and its homogenous dispersion throughout the polymer matrix with 3 and 5wt% GO. However, the intercalated structure is predominant with 5wt% GO. The homogenous and the strong interaction of the GO layers and the PAA-g-amylose hydrogel matrix induced the significant improvement in thermal properties of the nanocomposite hydrogel. The thermal stability improved by 67°C and Tg shifted to the higher temperature by 53°C at 5wt% GO loading, compared to the pristine hydrogel matrix.

کلیدواژه ها:

PAA-g-amylose ، hydrogel ، thermal stability ، nanocomposite