Premium
Photoinitiator‐Free UV‐Cured Acrylic Coatings Containing Magnetite Nanoparticles
Author(s) -
Sangermano Marco,
Vescovo Lorenzo,
Pepino Niccolò,
Chiolerio Alessandro,
Allia Paolo,
Tiberto Paola,
Coisson Marco,
Suber Lorenza,
Marchegiani Giada
Publication year - 2010
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201000444
Subject(s) - photoinitiator , superparamagnetism , materials science , polymerization , polymer chemistry , nanoparticle , magnetite , chemical engineering , uv curing , magnetization , curing (chemistry) , composite material , nanotechnology , polymer , physics , monomer , quantum mechanics , magnetic field , engineering , metallurgy
A dispersion of magnetite nanoparticles in hexane has been added to 1,6‐hexanediol diacrylate at 5–40 phr. The obtained formulations have been polymerized by means of UV light in the absence of any radical photoinitiator and the cured films have been fully characterized. The photoinitiator activity of the magnetite nanoparticles is demonstrated: upon photoexcitation, Fe 3 O 4 can generate radicals which in turn start polymerization chains. Isothermal magnetization curves showed that at room temperature, the cured material exhibits no hysteretic features, indicating a superparamagnetic‐like behavior. At temperatures below 100 K, a significant magnetic hysteresis gradually appears but a substantial fraction of magnetic nanoparticles is still in the superparamagnetic phase even at T = 10 K.