Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 308, Issue 2, Pages 318-324Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2007.01.022
Keywords
nanoparticle dispersion; nanocomposites; fumed silica; PMMA; ball milling
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Fumed silica nanoparticles with 14 nm of diameter were blended with poly(methylmethacrylate), PMMA, by means of a high energy ball milling process. AFM analysis revealed how this process of blending allows obtaining a very homogeneous dispersion of the nanoparticles within the PMMA. Furthermore, it was observed that the properties of the composite are highly dependent on the active milling time: (i) SEM inspection showed that the particle size of the silica-PMMA nanocomposite decreases and (ii) DSC analysis demonstrated that the T-g also decreases due to a reduction in the molecular weight of the PMMA caused by chain scission during the high energy blending process. Two T-g's were obtained in the case of the nanocomposite when milling times were higher than 6 h, one of them being even higher than that of the PMMA without being subjected to the HEBM process. This result was assigned to surface-induced molecular weight segregation near the nanoparticles surface. It has been demonstrated the possibility of preparing transparent nanocomposites with excellent moldability. (c) 2007 Published by Elsevier Inc.
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