Department of Polymer Science and Technology, Faculty of Chemistry, University of the Basque Country, Paseo Manuel Lardizábal 3, San Sebastián 20018, Spain.
Department of Polymer Science and Technology, Faculty of Chemistry, University of the Basque Country, Paseo Manuel Lardizábal 3, San Sebastián 20018, Spain.
Int J Biol Macromol. 2018 Jul 15;114:599-613. doi: 10.1016/j.ijbiomac.2018.03.129. Epub 2018 Mar 26.
Unplasticized and glycerol plasticized chitosan/graphene (CS/GS) nanocomposites were synthesized via in situ chemical reduction of graphene oxide sheets (GO) with l-ascorbic acid (L-AA) as reductant by solution casting. The reduction of GO with L-AA was investigated to establish the optimal amount of reductant required to produce chemically reduced graphene sheets (GS). The combine effect of both nanofiller and glycerol on the structure, thermal, mechanical, and electrical properties of CS/GS nanocomposite films was evaluated. Materials were characterized by FT-IR, NMR, UV-Vis, XPS, XRD, Raman, SEM, TEM, and TGA. The results showed that GS sheets were homogeneously dispersed throughout the CS matrix, and that interactions between CS and the surface of GS took place. When compared with neat CS, nanocomposites showed a decrease in the crystallinity, better thermal stability under oxidative atmosphere, and improved mechanical properties, while maintained the thermal properties of CS under inert conditions. Combined use of glycerol and GS led to substantially enhanced mechanical properties. The electrical conductivity was increased with increasing GS loading in nanocomposite. This study demonstrates how CS/GS nanocomposites performance properties can be tailored by controlling GsS and plasticizer content.
未增塑和甘油增塑壳聚糖/石墨烯（CS/GS）纳米复合材料是通过原位化学还原氧化石墨烯片（GO）与 L-抗坏血酸（L-AA）作为还原剂通过溶液浇铸合成的。研究了 L-AA 对 GO 的还原作用，以确定产生化学还原石墨烯片（GS）所需的最佳还原剂用量。评估了两种纳米填料和甘油对 CS/GS 纳米复合材料薄膜的结构、热性能、机械性能和电性能的综合影响。通过 FT-IR、NMR、UV-Vis、XPS、XRD、拉曼、SEM、TEM 和 TGA 对材料进行了表征。结果表明，GS 片均匀分散在 CS 基体中，CS 与 GS 表面之间发生了相互作用。与纯 CS 相比，纳米复合材料的结晶度降低，在氧化气氛下的热稳定性更好，机械性能得到提高，而在惰性条件下 CS 的热性能保持不变。甘油和 GS 的联合使用导致机械性能显著提高。纳米复合材料的电导率随 GS 负载量的增加而增加。本研究表明，通过控制 GS 和增塑剂含量可以调整 CS/GS 纳米复合材料的性能。
