Oxidative stability of polyaniline

0376674 - ÚMCH 2013 RIV NL eng J - Journal Article
Stejskal, Jaroslav - Exnerová, Milena - Morávková, Zuzana - Trchová, Miroslava - Hromádková, Jiřina - Prokeš, J.
Oxidative stability of polyaniline.
Polymer Degradation and Stability. Roč. 97, č. 6 (2012), s. 1026-1033. ISSN 0141-3910. E-ISSN 1873-2321
R&D Projects: GA ČR GA202/09/1626; GA ČR GAP205/12/0911
Institutional research plan: CEZ:AV0Z40500505
Institutional support: RVO:61389013
Keywords : polyaniline * nanotubes * oxidation stability
Subject RIV: BK - Fluid Dynamics
Impact factor: 2.770, year: 2012

Standard globular and nanotubular polyaniline were exposed to strong oxidants, such as hydrogen peroxide or ammonium peroxydisulfate, in acidic, neutral, and alkaline aqueous media for 10 or 60 days. Even in the mixture of 30% hydrogen peroxide and concentrated sulfuric acid, polyaniline was not completely destroyed and left >30 wt.% residue. In 1 m ammonium peroxydisulfate dissolved in various media, only marginal changes in mass of polyaniline were observed, except for concentrated sulfuric acid where the residue was ≈10 wt.%. A partial dissolution of globular polyaniline in acid was responsible for this result. The changes in the molecular structure have been assessed by UV–visible, FTIR, and Raman spectroscopies. The oxidation stability of nanotubular polyaniline was better compared with the common globular form. After the exposure to oxidants in acidic media, the conductivity was reduced but not completely.
Permanent Link: http://hdl.handle.net/11104/0209017