Hameed Nishar, Dumée Ludovic F, Allioux Francois-Marie, Reghat Mojdeh, Church Jeffrey S, Naebe Minoo, Magniez Kevin, Parameswaranpillai Jyotishkumar, Fox Bronwyn L
Factory of the Future, Swinburne University of Technology, Hawthorn, Australia.
Deakin University, Geelong, Institute for Frontier Materials, Waurn Ponds, Victoria, 3216, Australia.
Sci Rep. 2018 Feb 12;8(1):2803. doi: 10.1038/s41598-018-21114-5.
Graphene based room temperature flexible nanocomposites were prepared using epoxy thermosets for the first time. Flexible behavior was induced into the epoxy thermosets by introducing charge transfer complexes between functional groups within cross linked epoxy and room temperature ionic liquid ions. The graphene nanoplatelets were found to be highly dispersed in the epoxy matrix due to ionic liquid cation-π interactions. It was observed that incorporation of small amounts of graphene into the epoxy matrix significantly enhanced the mechanical properties of the epoxy. In particular, a 0.6 wt% addition increased the tensile strength and Young's modulus by 125% and 21% respectively. The electrical resistance of nanocomposites was found to be increased with graphene loading indicating the level of self-organization between the ILs and the graphene sheets in the matrix of the composite. The graphene nanocomposites were flexible and behave like ductile thermoplastics at room temperature. This study demonstrates the use of ionic liquid as a compatible agent to induce flexibility in inherently brittle thermoset materials and improve the dispersion of graphene to create high performance nanocomposite materials.
首次使用环氧热固体制备了基于石墨烯的室温柔性纳米复合材料。通过在交联环氧树脂中的官能团与室温离子液体离子之间引入电荷转移络合物，使环氧热固体制得具有柔性。由于离子液体阳离子与π键的相互作用，发现石墨烯纳米片在环氧基质中高度分散。据观察，向环氧基质中加入少量石墨烯可显著提高环氧树脂的机械性能。特别是，添加0.6 wt%的石墨烯可使拉伸强度和杨氏模量分别提高125%和21%。发现纳米复合材料的电阻随石墨烯负载量的增加而增大，这表明离子液体与复合材料基质中石墨烯片之间的自组装程度。石墨烯纳米复合材料具有柔性，在室温下表现得像韧性热塑性塑料。本研究证明了使用离子液体作为相容剂可在固有脆性的热固性材料中引入柔性，并改善石墨烯的分散性，从而制备出高性能的纳米复合材料。
