Prevention of polymerization

Kumar, Sh., Koganti, S.B. 1997. A numerical model for boundary acid concentration for prevention of polymerization at macro Pu concentrations. J. Nucl. Sci. Technol. 34 (10) 1027-1028. 

PANI/silica hybrid nanofiber webs were prepared by using two different methods. The first one was in situ polymerization of aniline-doped silica nanofibers in an ammonium persulfate solution and the second one was immersing the silica nanofibers into a PANl solution. Effects of different pol5mierization parameters on conductivity were investigated. The PANI/silica hybrid nanofiber web electric conductivity increased with increasing monomer concentration. The electrical conductivities of the hybrid web were 5 X 10-5,17 X 10-3, 4 5 X 10-3, 3 2 x 10 3, and 1.07 S/cm for 0.2, 0.5, 0.7, and 1.0 M aniline solutions and pure polyaniline, respectively. The electrical conductivity showed the maximum at 1.0 of the molar ratio of the oxidant and aniline and decreased with an increase of the oxidant concentration. This result was explained by the prevention of polymerization by excess oxidant. The molar ratio of oxidant and aniline is generally about 1.0 for s5mthesis of PANI. 

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