Study On Preparation And Performance Of Functional Fabric Coated With Reduced Graphene Oxide

Graphene functional fabrics have received extensive attention in recent years,and have broad development prospects in in artificial intelligence,medical and health,etc.The current research hotspot is mainly concentrated on the preparation of flexible,bendable,stretchable multi-functional fabrics,and their electrical behavior and structural evolution are key issues that people pay attention to.Reduced graphene oxide（RGO）maintains the typical hexagonal ring honeycomb monolayer structure of graphene,and has significant characteristics such as ultra-high theoretical specific surface area,low density,high dielectric loss,unique surface properties,and excellent chemical stability.With large saturation magnetization and low power loss at high frequencies,Manganese ferrite（Mn Fe₂O₄）that exhibits soft magnetic properties in nature is a kind of ferrite.Combining RGO and Mn Fe₂O₄ with textile substrates is an effective way to improve the functionalization of textile materials.This research is dedicated to constructing functional coatings on polyester base fabrics to prepare RGO coated functional fabrics,and in order to realize the reuse of waste during the preparation of graphene and reduce energy loss,manganese ferrite nanoparticles are further incorporated into graphene oxide（GO）to prepare RGO//Mn Fe₂O₄ coating functional fabrics.Further,the effect of high-frequency washing on the performance of RGO-based coated functional fabrics was investigated.The main research contents and conclusions are as follows:First and foremost,GO was prepared based on the improved Hummers’method,and the polyester base fabric was treated with GO coating.The functional coating was constructed on the base fabric by chemical reduction of hydrazine hydrate,preparing a flexible,stretchable and bendable RGO coated functional fabric.The RGO coating on the functional fabric was reduced,which led to the augments of the sp² hybrid orbital crystallinity and the electron conduction,and there were graphite lattice and ionic impurity defects.RGO nanosheets and polyester base fabrics are combined tightly into a conductive network structure,due to the existence of non-covalent bond interactions and van der Waals forces.The RGO coated functional fabric has good thermal stability and excellent hydrophobicity,water contact angle of 141°,and excellent protection against UV rays,ultraviolet-visible light transmission rate close to zero.Secondly,the residual manganese ions during the preparation of GO were prepared by the Hummers’method,combined with iron ions,and a composite coating of RGO nanosheets and manganese ferrite nanoparticles was constructed on the polyester base fabric.The composite coating produced a strong surface tension effect on the polyester.The obtained RGO//Mn Fe₂O₄coated functional fabric can reduce the intake of visible light and ultraviolet rays,and exhibited good thermal stability;the composite coating contained hydrophobic and hydrophilic segments,which were tightly combined with the polyester base fabric through high surface tension,so that the oil contact angle of the functional fabric is as high as 153°under water condition.Last but not least,the above two types of RGO-based coating functional fabrics were subjected to high-strength washing tests.Surfactants were added in a rotating airtight environment.Stainless steel beads provided a certain mechanical force.Originally,the surface coating of the functional fabric was peeled off to a certain extent after high-frequency washing,but a continuous and smooth protective layer was still formed on the surface of the fiber,showing good washing resistance.After washing,the RGO coated functional fabric has good hydrophobicity（119.39°）;the RGO coated functional fabric has good thermal conductivity.As the number of washing increases,the initial heating rate of the RGO coated functional fabric decreases;With the increase of the RGO coating content,the initial heating rate decreased,and the phenomenon was attributed to the non-dense structure of the RGO coating itself.The RGO-C-10 sample was washed for 8 times,and the conductivity was 59.5 m S/cm.After washing,the RGO//Mn Fe₂O₄ coated functional fabric has certain electrical conductivity（4.96μS/cm）,and exhibits good underwater oleophobicity（150.71°）.In the thermal imaging test of contact with human body,the same ratio of RGO//Mn Fe₂O₄coated functional fabric showed an upward trend in a relatively short period of time,and the final temperature was lower than that of the RGO coated fabric,which indicated that the composite coating made the thermal conductivity of the functional fabric worse.