Department of Chemical and Environmental Engineering, 'Materials+Technologies' Group, Engineering College of Gipuzkoa, University of the Basque Country (UPV/EHU), Plaza Europa 1, 20018 Donostia-San Sebastian, Spain; Department of Graphical Expression and Project Management, Engineering College of Gipuzkoa, University of the Basque Country (UPV/EHU), Plaza Europa 1, 20018 Donostia-San Sebastian, Spain.
Department of Chemical and Environmental Engineering, 'Materials+Technologies' Group, Engineering College of Gipuzkoa, University of the Basque Country (UPV/EHU), Plaza Europa 1, 20018 Donostia-San Sebastian, Spain.
Int J Biol Macromol. 2023 Sep 30;249:126130. doi: 10.1016/j.ijbiomac.2023.126130. Epub 2023 Aug 3.
Plasticized starch (PLS) nanocomposite films using glycerol and reinforced with graphene (G) and graphene oxide (GO) were prepared by solvent casting procedure. On one hand, the influence of adding different G contents into the PLS matrix was analyzed. In order to improve the stability of G nanoflakes in water, Salvia extracts were added as surfactants. The resulting nanocomposites presented improved mechanical properties. A maximum increase of 287 % in Young's modulus and 57 % in tensile strength was achieved for nanocomposites with 5 wt% of G. However, it seemed that Salvia acted as co-plasticizer for the PLS. Moreover, the addition of the highest G content led to an improvement of the electrical conductivity close to 5 × 10 S/m compared to the matrix. On the other hand, GO was also incorporated as nanofiller to prepare nanocomposites. Thus, the effect of increasing the GO content in the final behavior of the PLS nanocomposites was evaluated. The characterization of GO containing PLS nanocomposites showed that strong starch/GO interactions and a good dispersion of the nanofiller were achieved. Moreover, the acidic treatment applied for the reduction of the GO was found to be effective, since the electrical conductivity was 150 times bigger than its G containing counterpart.
采用甘油增塑的淀粉（PLS）纳米复合材料薄膜，并用石墨烯（G）和氧化石墨烯（GO）增强，通过溶剂浇铸法制备。一方面，分析了向 PLS 基质中添加不同 G 含量的影响。为了提高 G 纳米片在水中的稳定性，添加了鼠尾草提取物作为表面活性剂。所得纳米复合材料表现出改善的机械性能。当 G 的含量为 5wt%时，杨氏模量最大增加了 287%，拉伸强度最大增加了 57%。然而，鼠尾草似乎起到了 PLS 的协同增塑剂的作用。此外，添加最高含量的 G 导致电导率接近 5×10 S/m，与基质相比有所提高。另一方面，也将 GO 作为纳米填料加入来制备纳米复合材料。因此，评估了增加 GO 含量对 PLS 纳米复合材料最终性能的影响。GO 含量增加的 PLS 纳米复合材料的表征表明，实现了淀粉/GO 之间的强相互作用和纳米填料的良好分散。此外，发现用于还原 GO 的酸处理是有效的，因为电导率比含有 G 的对应物大 150 倍。
