Glass transition behavior of alumina/polymethylmethacrylate nanocomposites

By B. J. Ash, Linda Schadler, R. W. Siegel. 2002

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Dielectric properties of epoxy nanocomposites (2008, neutral): “A similar observation of a reduction in the values of Tg with addition of small amounts of nano-fillers has been reported for alumina filled PMMA nanocomposites [16].”
Review article: Polymer-matrix Nanocomposites, Processing, Manufacturing, and Application: An Overview (2006, background): “For example the change in Tg by using nanofiller composites has been controversial [128,327,328].”
Polymer-Nanoparticle Composites: From Synthesis to Modern Applications (2010, methodology): “The Rensselaer group of Siegel investigated the influence of coated and uncoated Al2O3 (average particle size around 39 nm) on the glass transition (TG) behavior of PMMA [110,111].”
The amount of immobilized polymer in PMMA SiO$_{2}$ nanocomposites determined from calorimetric data (2007, background): “The glass transition temperature of the nanocomposite was found to increase [22–28], to decrease [27,29–31], not to be influenced at all [22,25,27,29,32,33] or the glass transition disappeared totally [27,34–36].”
Permittivity and tan delta characteristics of epoxy nanocomposites in the frequency range of 1 MHz-1 GHz (2008, background): “An increase in Tg [37, 43] has been observed in few cases whereas few other reports cite a reduction in Tg when nanofillers are added to polymers [44], but most of the proposed theories are still inconclusive.”