Microtubules of polyaniline as new microwave absorbent materials

The microtubules of polyaniline (PANI) with room temperature conductivity of 3.5–2.6 S/cm were synthesized by a template-free method. The structural characterizations by UV-vis and FT-IR spectra as well as ­X-ray diffraction showed that the polymer chain of the resulting microtubules was identical to the PANI doped with HCl, but its crystallinity was higher than that of PANI-HCl. Moreover, the resulting microtubules exhibited an unusual magnetic loss at the microwave frequency (f = 1–18 GHz) arose from order arrangement of polaron as charge carrier caused by a tubular morphology. Copyright © 2001 John Wiley & Sons, Ltd.

[1]  W. Helfrich.  Electric Alignment of Liquid Crystal , 1973 .

[2]  C. R. Martin,et al.  Template synthesis of electronically conductive polymers - A new route for achieving higher electronic conductivities , 1993 .

[3]  P. Hourquebie,et al.  Microwave properties of conductive polymers , 1994 .

[4]  M. Wan,et al.  Mechanism of proton doping in polyaniline , 1995 .

[5]  M. Wan.  Absorption spectra of thin film of polyaniline , 1992 .

[6]  A. Mohan,et al.  A study of microwave transmission, reflection, absorption, and shielding effectiveness of conducting polypyrrole films , 1994 .

[7]  A. Heeger,et al.  Spectroscopic studies of polyaniline in solution and in spin-cast films , 1989 .

[8]  P. Lacaze,et al.  Electromagnetic absorption of polyanilines at microwave frequencies , 1992 .

[9]  J. Unsworth,et al.  Microwave transmission, reflection and dielectric properties of conducting and semiconducting polypyrrole films and powders , 1993 .

[10]  In situ doping polymerization of polyaniline microtubules in the presence of ?-naphthalenesulfonic acid , 1999 .

[11]  A. MacDiarmid,et al.  Electrochemical Characteristics of “Polyaniline” Cathodes and Anodes in Aqueous Electrolytes , 1985 .

[12]  Vijay K. Varadan,et al.  Measurement of the electromagnetic properties of chiral composite materials in the 8-40 GHz range , 1994 .

[13]  Patrick Hourquebie,et al.  Microwave absorbing materials based on conducting polymers , 1993 .

[14]  Barry Chambers,et al.  Large area conducting polymer composites and their use in microwave absorbing material , 1992 .

[15]  M. Wan,et al.  Formation mechanism of polyaniline microtubules synthesized by a template‐free method , 2000 .

[16]  A. Heeger,et al.  X-ray scattering from crystalline polyaniline , 1989 .

[17]  Wang Meixiang,et al.  STUDIES ON MAGNETIC PROPERTIES OF FILM OF POLYANILINE , 1992 .

[18]  K. Neoh,et al.  Polyaniline treated with organic acids: doping characteristics and stability , 1995 .

[19]  Barry Chambers,et al.  Electrical characteristics of polypyrrole composites at microwave frequencies , 1994 .