کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1400006 | 984518 | 2010 | 10 صفحه PDF | دانلود رایگان |
Poly(ortho-phenylenediamine) and oligomers of ortho-phenylenediamine were chemically synthesized and characterized by UV–vis, 1H and 13C NMR, FTIR and resonance Raman spectroscopies. Polymerization of ortho-phenylenediamine in HCl medium with ammonium persulfate only leads the trimer compound, in disagreement with some previous reports. Nevertheless, in acetic acid medium it was possible to prepare a polymer constituted by ladder phenazinic segments with different protonation levels and quinonediimine rings (polyaniline-like). X-ray absorption at N K-edge (N K XANES), X-ray photoelectron (XPS) and Electron paramagnetic resonance (EPR) spectroscopies were used to determine the different kinds of nitrogen presents in this class of polymer. N K XANES spectrum of poly(ortho-phenylenediamine) shows the band of N nitrogen of non-protonated phenazinic rings at 398.2 eV. In addition, XPS and N K XANES data confirm the presence of different types of protonated nitrogens in the polymeric poly(ortho-phenylenediamine) chain and the EPR spectrum shows that the polymer has a very weak polaronic signal.
Poly(ortho-phenylenediamine) and oligomers of ortho-phenylenediamine were characterized by Raman, FTIR, UV–vis, X-ray absorption, XPS, EPR, MALDI spectroscopies. It was determined that the polymer is constituted by phenazinic and quinonediimine segments with different protonation levels.Figure optionsDownload as PowerPoint slide
Journal: European Polymer Journal - Volume 46, Issue 3, March 2010, Pages 484–493