Interfacial Effect Of Janus Particles On Polymers Bicontinuous Phase,foaming,and Heterogeneous Catalytic Reactions

Janus materials are materials with an asymmetric structure which combine different physicochemical properties.In this thesis,two types of Janus particles,SiO₂@PS and TiO₂@PDVB,were prepared by the phase separation and swelling methods.The SiO₂@PS Janus particles were added to the polymer as functional fillers to investigate their effect on the morphology of the blends and the modulation of the cell morphology of the PS foams.The stabilisation effect of TiO₂@PDVB on Pickering emulsion and photocatalytic properties were investigated.The main studies are as follows.1.Stabilized effect on bicontinuous phases Induced by Migrating Janus Particles and Its Application in Thermal Conductivity.Epoxy-SiO₂@PS Janus particles（EJPs）were obtained by grafting KH560 onto the SiO₂end of the Janus particles and used in the compatible modification of PS/PA6 blends.The EJPs enhance the interfacial forces of the blends and facilitate the formation of bicontinuous structures.During the blending process,EJPs spontaneously migrate to the interface of the blends,acting as a refinement and stabilisation of the dispersed phase.PA6/r GO composites with good photothermal conversion were obtained by etching the PS phase and then infusing the r GO dispersion.The water evaporation rate of the PA6/r GO9 fraction was 1.84 kg m^-2under 1 sun irradiation,which was 4.7 times higher than that of the control(0.39 kg m^-2).2.Preparation and properties of SiO₂@PS Janus particles induced PS foams.the PS end of Janus particles is compatible with the matrix,which is conducive to particle dispersion in the matrix;while the SiO₂end plays the role of a heterogeneous nucleation site,which can increase the amount of CO₂adsorption and is conducive to reducing the cell size and improving the uniformity of the cell to perfect the bubble structure.With the increase of JPs content,the more uniform the distribution of celle size and the higher the compression strength.3.Pickering effect of TiO₂@PDVB Janus particles and their non-homogeneous photocatalytic degradation performance.The Janus particles with amphiphilic nature are conducive to the formation of stable Pickering emulsions.The Janus particles at the oil-water interface can fully contact with the oil phase,which is more conducive to improving the catalytic efficiency compared with pure TiO₂.At the same time,the TiO₂@PDVB Janus solid particles at the interface provide a channel for oil-water transport,which allows a continuous flow of nitrobenzene from the oil phase to the interface,and the contact probability between the organic matter and the TiO₂is greatly increased,thus providing a better catalytic effect.The degradation rates of nitrobenzene by TiO₂and TiO₂@PDVB Janus particles were 61.8%and 67.4%at 60 min of light exposure,respectively.