Preparation Of Conjucted Polymer Based On Electrodepositing Method And Properties Study

In this work, we prepared various polymer particles (such as PAni, PPy, PFOS-PPy) with electrochemical-depositing method, followed by treatment with low-surface-energy material via chemical vapor deposition (CVD) method on the surface of polymer (such as PAni, PPy).Based on monomers such as aniline and pyrrole, the PAni and PPy were electrodeposited onto the stainless mesh and nickel foam as the roughness surface, respectively. Also, the PAni and PPy was modified by low-surface-energy materials such as PDMS and FAS, respectively. Based on the monomer of pyrrole and the doptant of PFOS, the reversible switching PFOS-PPy film from hydrophobicity to hydrophilicity was also prepared by electrodepositing method. The changes in the morphology, crystalline structures and surface chemical composition of the polymer particles before and after surface modification were investigated by SEM, Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS) analysis and contact angle (CA). As SEM images indicate that polyaniline (PAni) were performed in nano-particles with an average particle size of ca.10nm, and formed aggregately into the highly porous structure with an average micropore size of ca.1μm. Polypyrrole (PPy) particles were performed in particles with an average particle size of ca.10μm in diameter. The oxidized PFOS-PPy was performed in particles with an average particle size of ca.1μm and porous size of3-10μm. As FT-IR indicates that PDMS-treated PAni and FAS-treated PPy have Si-O bond, suggesting that the surface of polymer was only successfully modified by the low-surface-energy material, which is also confirmed by XPS. As CA indicates that PDMS-treated PAni film shows hydrophobicity with the water CA of148°, FAS-treated PPy film has the superhydrophobicity with the water CA of155°. However, after the reduced-reaction treatment, the reduced PFOS-PPy film has the superhydrophilicity with the water CA of0°.The adsorption performance and recyclability were tested. With different materials as subtrates, the hydrophobic PAni and PPy surfaces were prepared with modification of PDMS or FAS. Choosing the316-stainless steel mesh as the substrate, PDMS-treated PAni film can be achieved the dynamic and continual separation of organics and oils from water with the separating effect of ca.80%-95%under negative pressure, meanwhile, the hydrophobicity has little change with the water CA of144.8°after some times. On the basis of nickel foam, FAS-treated PPy film can be continually realized the separation of organics and oils from water under the gravity effect with the separation capacity of0.68g/cm-3-1.48g/cm-3, and the hydrophobicity has little change with the water CA of145°after some times. With the doping of PFOS, the oxidized PFOS-PPy film on the basis of316-stainless steel mesh can be achieved the separation for organics (oils) from water. Meanwhile, under the adapting of electric-pressure, it makes reversible conversion of PFOS-PPy films from hydrophobicity to hydrophilicity.