Preparation Of Graphene Cellulose Composite Fiber And Its Application In The Field Of Sensor

Graphene was founded by the researchers of the university of Manchester in England since 2004,rapidly set off the boom of graphene in the community of reasearch.Graphene has been the thinnest and the strongest material in the world so far.And the excellent electrical conductivity,electron mobility,thermal conductivity,pervious to light,hydrophobic property and mechanical property of graphene make it widely explored and applied in the field of energy,photoelectric,composite materials,water treatment and biological medicine.However,the research of functional applications of graphene in textiles is still at the preliminary stage.And a lot of innovative research work is needed.Besides,the scholar's study of graphene used in the textiles mostly was limited to the study of various properties of graphene,which,to a certain extent,restrict the application of graphene used in the field of textile widely.Therefore,it is required to explore the extension application of graphene in the field of textile.The wet spinning technology was used in the article to spin graphene cellulose composite fiber,making the graphene cellulose composite fiber with the property of conductive and thermal and so on.What's more,the application of sensor of this composite fiber was explored,enlarging the range of the application of graphene as a textile material.The main research content of this article is as follows:(1)The cellulose solution,whose concentration was 4%,was prepared with cellulose pulp as raw materials and N,N-dimethyl acetamide as solvent.Then the solution was spun by the wet spinning machine.The best technological conditions of the wet spinning was the concentration of 4%,the coagulation bath temperature of 30 ?,the optimal coagulation time of 1.5 hours and the draft ratio of 1.3 times by the single experiment of concentration,coagulation bath temperature,coagulation time of spinning.(2)Cellulose solution is seen as matrix spinning solution.And then add the graphene which is dried into the matrix spinning solution.In the mixed solution,the graphene accounted the proportion of cellulose were 10%,15%,20%,15%,30%.The homogeneous mixed spinning dope was obtained by ultrasonic and stirring.The composite fibers was obtained by the spinning mechanism in the laboratory.Scanning electron microscopy(sem)results showed that with the increase of the content of graphene,the fold on the surface of the composite fiber increase,indicting the increase of the graphene content;Infrared spectrum shows the presence of graphene in composite fibers;Mechanical performance testing experiments show that the mechanical properties of composite fiber with the increase of graphene content showed a trend of increase after first decreases;When the concentration of graphene is 25% or 30%,the conductivity of composite fibre of 1.77 x 10-2 S/cm,after washing or insolation,conductivity is not changed obviously.graphene and cellulose fiber composite performance is more stable.In addition,graphene cellulose spinning dope was made into membrane.And the thermal conductivity of membrane and ultraviolet resistance performance was the tested.With the increase of the content of graphene,the two performance is proportional to the content of graphene.(3)The graphene cellulose composite fiber was combined with flexible PVC to make a thin flexible strain sensor.And the properties of different temperature,humidity,bending curvature and under different tensile elongation strain was explored.Besides,the curve of the resistance of the standardization-different strain response was drew.Experiments show that the sensor has good reversibility,and it will have broad applications in intelligent textiles and electronic skin.