Study On Porous Polyacrylonitrile Composites Based On Pickering Emulsion

Porous materials are of complex structure with interconnected or sealed pores exhibiting light weight,high specific surface area and thermal insulation property,which have been extensively used as catalyst support,damping,adsorption,energy storage and electrochemistry fields.As a methodology for preparing porous materials,Pickering emulsion stabilized by solid particles has the characteristics of good stability,low cost and environmental friendliness.Due to distinctive structure and performance,a great deal of attention has been paid to carbon nanotubes?CNTs?and graphene oxide?GO?with excellent physical performances.In this study,an efficient strategy for assembling CNTs and GO into versatile carbon nanohybrid stabilizer with tailorable amphiphilicity has been proposed.The as-synthesized slightly hydrophobic carbon nanohiybrids can be used to stabilize W/O Pickering emulsion using acrylonitrile?AN?/divinylbenzene?DVB?as the mixed continuous oil phase along with Span 80.A porous GO/CNTs/polyacrylonitrile?PAN?nanocomposites is achieved after free radical polymerization of the W/O Pickering emulsion to examine its structure and properties and the effects of thermal treatment.A hierarchically porous architecture has been demonstrated in GO/CNTs/PAN nanocomposites based on W/O Pickering emulsion strategy by the characterization of FTIR,XPS,Raman spectroscopy,X-ray diffraction?XRD?and N₂adsorption isotherm curves,in which a three-dimensional continuous carbon network has been constructed via the self-assembly of GO/CNTs nanohybrids.The experimental results show that the electrical conductivity,thermal conductivity and mechanical properties of porous GO/CNTs/PAN nanocomposites prepared by W/O type Pickering emulsion are the function of the concentration and formulation of carbon nanohbyrid stabilizers.When the mass ratio of GO to CNTs in the stabilizer is 6:1,the electrical conductivity and mechanical properties of the porous composite reach the maximum values and when the mass ratio of GO to CNTs in the stabilizer is 2:1,the highest thermal conductivity of the porous composite is attained.After heat treatment,the specific surface area of the porous nanocomposites increases with the increased heat treatment temperature.XPS,Raman and XRD tests indicate that the formation of ordered porous carbon is attributed to the heat treatment imposed in this study.