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 X-ray analysis (XRD) and Fourier transform infrared spectroscopy (FTIR). The thermal and mechanical behaviors of synthesized hydrogel were investigated by thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC) and tensile testing. 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 5 wt% GO. However, the intercalated structure is predominant with 5 wt% GO. The homogenous and the strong interaction of the GO layers and the PAA-g-amylose hydrogel matrix induced the significant improvement in thermal and mechanical properties of the nanocomposite hydrogel. The tensile strength and elastic modulus of the nanocomposite hydrogel increased by 124% and 26%, respectively with 3 wt% GO loading. The thermal stability improved by 67 °C and T_g shifted higher temperature by 53 °C at 5 wt% GO loading, compared to the pristine hydrogel matrix.

在本研究中，基于接枝到直链淀粉（PAA-g-直链淀粉）上的聚（丙烯酸）合成了纳米复合水凝胶，其中直链淀粉包含不同含量的氧化石墨烯（GO）纳米片。通过X射线分析（XRD）和傅里叶变换红外光谱（FTIR）表征了优化后样品的结构性能。通过热重分析（TGA），差示扫描量热法（DSC）和拉伸试验研究了合成水凝胶的热力学行为。XRD和扫描电子显微镜研究表明，高剥落的GO层的形成及其在整个聚合物基质中的均匀分散（GO含量为3和5 wt％）。但是，插层结构以5重量％的GO为主。GO层与PAA-g-直链淀粉水凝胶基质的均质和强相互作用引起了纳米复合水凝胶的热和机械性能的显着改善。纳米复合水凝胶的抗张强度和弹性模量在GO负载为3 wt％时分别增加了124％和26％。热稳定性提高了67°C和T与原始水凝胶基质相比，在5 wt％的GO负载下，_g将较高的温度移动了53°C。