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Surface modification of carbonyl iron powders with silicone polymers in supercritical fluid to get higher dispersibility and higher thermal stability
Author(s) -
Huang Ronghua,
Wang Li,
Lin Yin,
Dong Yawei,
You Dun
Publication year - 2017
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6061
Subject(s) - polymer , supercritical fluid , thermal stability , surface modification , silicone , chemical engineering , carbonyl iron , materials science , polymer chemistry , chemistry , organic chemistry , composite material , engineering
The surface of carbonyl iron powder (CIP) was modified in supercritical fluid with silicone polymers containing reactive Si‐OCH 3 groups. Fourier‐transformed infrared spectroscopy, X‐ray photoelectron spectroscopy, X‐ray diffraction, and thermo gravimetric analysis were adopted to characterize CIP. The dispersibility of CIP in epoxy resin matrix was evaluated by castor oil absorption factor, dynamic viscosity, Mooney viscosity, and scanning electric micrograph. The electromagnetic reflectivity of the CIP‐filled epoxy resin coatings was also checked. It was confirmed that comparing with those treated at atmosphere, the supercritical treated CIP presented higher surface carbon content, higher dispersibility, higher thermal stability, and its original crystalline structure did not change greatly. Even though it experienced a high temperature and a high pressure (250 °C, 7.8 Mpa) during supercritical treatment, it was not oxidized, and its electromagnetic reflectivity did not decrease. Copyright © 2016 John Wiley & Sons, Ltd.