Citation:
XIONG Dong-Bai, YANG Chun-Ming. Preparation and Microwave-absorbing Properties of Poly(aniline-co-pyrrole)Copolymer/Fe3O4 Network Nanofiber Composites[J]. Chinese Journal of Applied Chemistry,
;2009, 26(9): 1054-1059.
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PAn-co-PPy/Fe3O4 network nanofiber composites were synthesized in Fe3O4 magnetic fluid by in situ chemical oxidative co-polymerization of aniline(An) and pyrrole(Py) monomers in the presence of cetyltrimethylammoniun bromide(CTAB).It was found that the morphology structures and electromagnetic properties of the nanocomposites can be tuned by varying the concentration of CTAB,the molar ratio of An/Py and the amount of Fe3O4 used.The resulting products were characterized by SEM,TEM,XRD,FT-IR,TG and the measurements of their electrical conductivities and hysteresis loops.The complex permittivity and permeability of samples were measured on a vector network analyzer in a range of 2~18 GHz,from which the reflection loss(R) curves of microwave vs frequency were calculated.The results show that the PAn-co-PPy/Fe3O4 nanocomposites take on a regular network nanofiber structure when the concentration of CTAB is 42 mmol/L,and the saturated magnetization is 14.8 emu/g when the content of Fe3O4 in the composite is 22.1%.XRD patterns confirmed the nanocomposite was composed of the Fe3O4 nanoparticles and PAn-PPy co-polymers.FT-IR spectra demonstrate the main characteristic absorption peaks corresponding to both PAn and PPy have red-shifted for the PAn-co-PPy/Fe3O4 nanocomposites.The PAn-co-PPy/Fe3O4 nanocomposites exhibit better microwave-absorbing properties than PAn,PPy,PAn-co-PPy,PAn/Fe3O4 or PPy/Fe3O4 composites,and it had a maximum reflection loss of-36.5 dB at 9.0 GHz with about 4.7 GHz bandwidth above-10 dB when the content of Fe3O4 in the composite was 12.4%.
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