| Graphene is a two-dimensional nanomaterial composed of carbon atoms with excellent mechanical,electrical,thermodynamic and optical properties,which is considered to be the most promising nanomaterial in the 21 st century.Composites made by mixing graphene or its derivatives with or in some way participating in the preparation of other materials are called graphene composites.In polymer composites,graphene has also been extensively studied.When at a low graphene addition level,the mechanical properties of graphene composites can be significantly improved,while giving the polymer new functions,such as electrical,thermal conductivity,electromagnetic shielding and other properties.However,since the discovery of graphene in 2004,it has only been 17 years now,but there are still many key technologies that have not been mastered.Especially in the field of functionalized graphene/polymer composite materials,the research is far from enough.Therefore,this paper focuses on the simple and efficient modification of graphene and the functionalization of graphene composites to prepare high-performance functionalized graphene/polymer composites.The details of research content and main results are as follows:1)Research on multi-scale graphene aerogel/epoxy composite materials for thermotherapy equipment.Copper-anchored functional graphene oxide(FGO)was prepared by an improved Hummers process.In order to make the FGO aerogel nanostructure a more ideal conductive model,acidified carbon tubes(ACNT)were introduced into the three-dimensional network structure.In the presence of ascorbic acid(VC)and polyvinyl alcohol(PVA),functionalized graphene-oxidized acidified carbon tube hydrogel(FGO-ACNT hydrogel)was formed,and then the freeze-dried method was used to obtain functionalized graphene-oxidized acidified carbon tube aerogel(FGO-ACNT aerogel).Finally,functionalized graphene-oxidized acidified carbon tube/epoxy(FGO-ACNT/ epoxy)composites can be obtained by vacuum perfusion without damaging the three-dimensional structure.When the total mass of FGO and ACNT is only 1.1% of that of FGO-ACNT/ epoxy composite,the conductivity of FGO-ACNT/ epoxy composite can reach 3.3 S/m,and it shows good stability in 22 electrothermal cycles.This fully meets the requirements of the use of hyperthermia equipment,so FGO-ACNT/ epoxy composite material can be used as a hyperthermia equipment to help human health.2)Research on 3D carbon structure enhanced flexible wearable sensor.The graphene oxide hydrogels(GO-ACNT Hydrogels)are prepared by hydrothermal method,and the GO-ACNT Hydrogels are processed into graphene microspheres(GOMS)with a dispersing machine.Multi-walled carbon nanotubes(MWNTs)were treated in a mixture of concentrated sulfuric acid and nitric acid at 70°C for 7 h and then acidified to obtain ACNT.Inspired by the synaptic structure of the brain nervous system,a graphene microsphere-acidified carbontube/water-based polyurethane(GAMS-ACNT/WPU)composite was prepared by using water-based polyurethane as matrix and carbon as conductive filler.Among them,GOMS is similar to cell body in neuronal structure,while ACNT is similar to synapse,thus forming an effective electron conduction network together.When 1% of GOMS and 1% of ACNT,the thermal conductivity of GOMS-ACNT/WPU composite membrane is increased by 73%.In the test samples prepared by 3D printing process,the signal quality did not decrease after 18 times of100% deformation tensile sensing tests.Meanwhile,stable and clear perceptual signals are also obtained in human joint perception tests. |
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