Chemical polymerization of aniline in phenylphosphinic acid

• Published in: Journal of the Serbian Chemical Society 2005-01, Vol.70 (10), p.1169-1182
• Main Authors: Plesu, Nicoleta, Ilia, Gheorghe, Bandur, Geza, Popa, Simona
• Format: Article
• Language: English
• Subjects: aniline; chemical oxidation; conducting polymers; phenylphosphinic acid; polyaniline
• ISSN: 0352-5139; 1820-7421
• DOI: 10.2298/JSC0510169P

The chemical polymerization of aniline was performed in phenylphosphinic acid (APP) medium using ammonium peroxidisulfate as the oxidizing agent, at 0 ?C and 25 ?C. The yield of polyaniline (PANI) was about 60?69 %. The polymerization process required an induction time 8?10 times greater than in other acids (hydrochloric, sulfuric). The average density of the obtained polymer was 1.395 g cm-3 for PANI-salt and 1.203 g cm-3 for PANI-base. The acid capacity of PANI depends on the synthesis parameters and the maximum value was 15.02 meq/g polymer. The inherent viscosity of PANI was 0.662 dl/g at aniline/oxidant molar ratios >2 and 0 ?C. The oxidation state was a function of the synthesis parameters and lay between 0.553?0.625, as determined from UV-VIS and titration with TiCl3 data. The PANI samples were characterized by measurements of their density, inherent viscosity conductivity, acid capacity, FTIR and UV-VIS spectrum, and thermogravimetric data. Izvedena je hemijska polimerizacija anilina u fenilfosfinskoj kiselini (APP) koriscenjem amonijum-peroksidisulfata kao oksidansa na 0 ?C i 25 ?C. Prinos polianilina (PANI) bio je oko 60?69 %. Za polimerizacioni proces bilo je potrebno indukciono vreme 8?10 puta vece nego u drugim kiselinama (hlorovodonicnoj, sumpornoj). Odredjivanje gustine uzorka polimera pokazalo je 1,395 g cm-3 za PANI-soi 1,203 g cm-3 za PANI bazu. Kiselinski kapacitet za PANI zavisi od parametara sinteze, a maksimalna vrednost bila je 15,02 meq/g polimera. Inherentni viskozitet PANI bio je 0,662 dl/g pri molskom odnosu anilin/oksidans > 2 i na 0 ?C. Oksidaciono stanje je bilo funkcija parametara sinteze i imalo je vrednost izmedju 0,553 i 0,625 i odredjeno je na osnovu podataka iz UV-Vis spektara i titracije sa TiCl3. PANI je karakterisan merenjima gustine, inherentne viskoznosti, provodljivosti, kiselinskog kapaciteta, FTIR, UV-Vis spektroskopijom i termogravimetrijom.