Preparation And Functional Research Of MXene Based Polymer Composites With Special Wettability

The two-dimensional material MXene has gained widespread attention in the fields of electromagnetic interference shielding,photothermal conversion,and solar evaporation due to its rich chemical properties,tunable surface termination,high electrical conductivity,photoelectricity,and surface hydrophilicity.In this thesis,multifunctional MXene based polymer composites with excellent properties were prepared by utilizing MXene as filler and combining it with polymer materials through simple spraying and dip-coating processes,etc.,and their applications in electrical and photothermal fields were investigated.The main research results are as follows:（1）MXene was physically mixed with polypyrrole（PPy）to obtain MXene/PPy ink and then the spraying process was used to prepare a cellulose laminated paper with excellent electrical properties.The addition of PPy improved the interfacial bonding between MXene and fibers,enabled the composite paper to achieve EMI shielding values of 40 d B and conductivity up to 1467 S m^-1.In addition,as well as showing good Joule heating stability and reliability,the composite paper can be used on a liquid-solid hydraulic triboelectric nanogenerator（H-TENG）with an output current of 8 n A.（2）Multifunctional fabrics were obtained by assembling MXene nanosheets onto textile fibers utilizing polydopamine followed by asymmetric hydrophobic treatment.The fabric exhibited high EMI shielding（36 d B）and photothermal conversion properties.After asymmetric hydrophobic treatment,the fabric can be used for the lossless transport of microdroplets.In addition,its solar water evaporation rate can reach 1.22 kg m^-2 h^-1 under one solar irradiation.（3）MXene was adsorbed onto the polymer sponge skeleton by dip-coating process,and then PPy was polymerized by the chemical method to obtain a porous photothermal sponge with excellent photothermal and solar evaporation performance.Secondly,by combining with different solar evaporation devices,the porous photothermal sponge can obtain solar evaporation rates of up to 2.27 kg m^-2 h^-1.More importantly,the design combination can well avoid the deposition of crystalline salt during the evaporation of seawater and solve the problem of slowing down the evaporation rate due to the crystalline deposition of salt particles during the long operation.