期刊
COMPOSITES SCIENCE AND TECHNOLOGY
卷 110, 期 -, 页码 138-144出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2015.02.007
关键词
Nano composites; Nano particles; Polymer-matrix composites (PMCs); Magnetic properties; Polyaniline
资金
- Fondazione Cariplo (Milano, Italy) (Magnetic-nanoparticle-filled conductive polymer composites for EMI reduction) [2012-0872]
- Italian MIUR (Oxides at the nanoscale: multifunctionality and applications) [FIRB RBAP115AYN]
Magnetically-hard, electrically-conducting polyaniline/CoFe2O4 nanocomposites were prepared by oxidative polymerization of N-(4-aminophenyl)aniline using molecular oxygen or hydrogen peroxide as the oxidants and magnetic CoFe2O4 nanoparticles, both uncoated and oleic acid-coated, with the double role of polymerization catalyst and magnetic filler. Oleic acid-coated nanoparticles showed higher catalytic activity than uncoated ones, especially under aerobic conditions. The size of the nanoparticles did not undergo significant changes during the polymerization process. The nanocomposites are magnetically hard with large remanence/saturation ratio, very large coercivity (8-15 kOe at 5 K) and do not display superparamagnetic effects even at RT. The addition of Fe3+ as a further oxidant allowed to tune the electroconductive properties of the materials, with conductivity ranging from 7.3.10(-5) S/cm to 5.5.10(-3) S/cm. (C)2015 Elsevier Ltd. All rights reserved.
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