Influence of reaction conditions on the formation of nanotubesanoparticles of polyaniline in the presence of 1-amino-2-naphthol-4-sulfonic acid and applications as electrostatic charge dissipation material

摘要

BACKGROUND:Poly(1-amino-2-naphthol-4-sulfonic acid)and its copolymers with aniline are a new class of conducting polymers which can acquire intrinsic protonic doping ability,leading to the formation of highly soluble self-doped homopolymers and copolymers.Free-OH and-NH2 groups in the polymer chain can combine with other functional groups that could be present in protective paints which can thus be successfully used as antistatic materials.RESULTS:This paper reports the formation of nanotubes of polyaniline on carrying out oxidative polymerization of aniline in the presence of 1-amino-2-naphthol-4-sulfonic acid(ANSA)in p-toluenesulfonic acid(PTSA)as an external dopant.The presence of-SO3 H groups in the ANSA comonomer allows the copolymer to acquire intrinsic protonic doping ability.The polymerization mechanism was investigated by analysing the ~1H NMR,~(13)C NMR,Fourier transform infrared and X-ray photoelectron spectra of the copolymers and homopolymers,which revealed the involvement of-OH/-NH2 in the reaction mechanism.Scanning and transmission electron microscopy showed how the reaction route and the presence of a dopant can affect the morphology and size of the polymers.Static decay time measurements were also carried out on conducting copolymer films prepared by blending of 1 wt% of copolymers of ANSA and aniline with low-density polyethylene(LDPE)which showed a static decay time of 0.1 to 0.31 s on dissipating a charge from 5000 to 500 V.CONCLUSION:Copolymers of ANSA with aniline were synthesized in different reaction media,leading to the formation of nanotubes and nanoparticles of copolymer.Blends of 1 wt% of PTSA-and self-doped copolymers of ANSA and aniline with LDPE can be formulated into films with effective antistatic properties.