Fabrication Of Magnetic Polyester Fabric Coated With Nanoparticles Fe₂O₃（Fe₃O₄） By Hydrothermal Method

In this paper, polyester fabric is first modified with ferric nitrate and oxalic acidunder hydrothermal conditions, and then modified with silane coupling agents. Thesurface of polyester fabric is coated with the magentic α-Fe2O3nanoprticles. Theoptimum processing parameters to prepare the Fe3O4–coated polyester fabric underhydrothermal conditions are determined by the single factor analysis method. Themorphology, chemical structure, crystalline phase, thermal stability, optical behaviorand magnetization properties of as-obtained fabric are analyzed by scanning electronmicroscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD),infrared spectroscope (IR), X-ray photoelectron spectroscope (XPS), thermalgravimetric (TG), differential scanning calorimetry (DSC), diffuse reflectancespectrum (DRS) and vibrating sample magnetometer (VSM) techniques. Theproperties of tensile, durable washing and photocatalytic activity for theα-Fe2O3-coated PET fabric are also investigated. The results show that the themagnetic polyester fabric can be fabricated when the process conditions are given asfollowing: The molar ratio of ferric nitrate to oxalic acid is2:3. The concentration offerric nitrate is0.03mol/l. The reaction temperature is150oC and the reaction time is4h. The as-prepared α-Fe2O3nanoparticles with diameter of100nm or so are graftedonto fiber surface. Compared with the original fabric, the degree of orientation andcrystallinity index for the α-Fe2O3-coated fiber decrease while the thermal stabilityincreases slightly. The visible light absorption capability and magnetism are obtained.The tensile properties decrease to some extent. The bonding strength between α-Fe2O3nanoparticle and polyester fiber is enhanced by coupling KH151. The photoactivefibers developed by depositing and grafting α-Fe2O3nanoparticles can degrade theadsorbed methyl orange under ultraviolet lights.Secondly, polyamide fabric is modified with ferric sulfate and sodium hydroxide asthe precursors and sodium dodecyl benzene sulfonate as the dispersant byhydrothermal method. A layer of α-Fe2O3nanoparticles is loaded on the surface ofpolyamide fiber by one step at low temperature in a hydrothermal process. Theas-prepared α-Fe2O3particle and α-Fe2O3-coated fabric are characterized using different characterization techniques, such as SEM, XRD, TEM, IR, XPS, TG, DSC,DRS, VSM. It is found that the modified polyamide fabric is endowed with themagentic properties. At the same time, it can photodegrade the methyl orange dyeafter exposure to untraviolet light.Finally, polyester fabric is treated with ferrous sulfate and sodium hydroxide as theraw materials and glacial acetic acid as the pH adjusting agent in the presence ofdispersing agents by the hydrothermal process. The structure and properties ofpolyamide fabric before and after treatments are characterized by means of SEM,TEM, XRD, IR, XPS, TG, DSC, DRS and VSM. The results indicate that the inversecubic spinel phase of Fe3O4nanoparticles with an average size50nm are synthesized,and synchronously deposited on fiber surface by physical absorption mode. Comparedwith the original polyester fabric, the Fe3O4-coated fabric having the magneticproperties can withstand the durable washing.