K. Khezri, H. Mahdavi
Jul 1, 2016
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Microporous and Mesoporous Materials
Abstract
Abstract Hexamethyldisilazane (HMDS) was employed to surface modification of hydrophilic silica aerogel nanoparticles. Then, the resultant modified nanoparticles were used for in situ polymerization of styrene by simultaneous reverse and normal initiation technique for atom transfer radical polymerization (SRN however, polydispersity index (PDI) values increases from 1.15 to 1.46. Appropriate agreement between theoretical and experimental molecular weight in combination with low PDI values demonstrate the living nature of the polymerization. Thermal stability of the neat polystyrene and its different nanocomposites are studied by TGA. Differential scanning calorimetry shows a decrease in glass transition temperature from 94.8 to 83.5 °C by adding 3 wt% of hydrophobic silica aerogel nanoparticles.