Open AccessSelf-assembly of nanostructures obtained in a microwave-assisted oxidative polymerization of aniline
Author(s) -
Marija GizdavicNikolaidis,
Milutin Jevremović,
Morgan C. Allison,
Dragomir R. Stanisavljev,
Graham A. Bowmaker,
Zoran D. Žujović
Publication year - 2014
Publication title -
express polymer letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.695
H-Index - 72
ISSN - 1788-618X
DOI - 10.3144/expresspolymlett.2014.77
Subject(s) - fourier transform infrared spectroscopy , aniline , materials science , electron paramagnetic resonance , scanning electron microscope , raman spectroscopy , polymerization , polyaniline , nuclear chemistry , analytical chemistry (journal) , polymer chemistry , nuclear magnetic resonance , chemistry , chemical engineering , polymer , organic chemistry , engineering , composite material , physics , optics
For the first time, microwave assisted aniline oxidative polymerization is performed in the presence of acetic acid (CH3COOH) and ammonium hydroxide (NH4OH) at different microwave power levels. The reaction system is kept at constant temperature of 24±1°C. The products are investigated by Fourier Transform Infrared Spectroscopy (FTIR), Raman, solid-state Nuclear Magnetic Resonance (NMR) and Electron Paramagnetic Resonance (EPR) spectroscopies. EPR signals in polyaniline (PANI) originate from the polarons formed upon protonation and doping by acid. The microwave radiation causes an increase in the spin concentration which is slightly more evident for 8 W than for 93 W. The morphology is investigated by using scanning electron microscopy (SEM). SEM micrographs revealed the formation of nanorods (in the presence of CH3COOH) and nanospheres (in the presence of NH4OH). FTIR, Raman and solid-state NMR spectroscopies indicate the presence of PANI and aniline oligomers. X-ray Diffraction (XRD) measurements showed the presence of well-ordered structures