Spherical mesoporous silica nanoparticles/tailor-made polystyrene nanocomposites by in situ reverse atom transfer radical polymerization
作者： Khezrollah Khezri , Hossein Roghani-Mamaqani , Mohammadreza Sarsabili , Masoud Sobani , Seyed-Ataollah Mirshafiei-Langari
DOI: 10.1134/S1560090414660026
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摘要: Spherical mesoporous silica nanoparticles (MCM-41)/tailor-made polystyrene nanocomposites were synthesized by in situ reverse atom transfer radical polymerization. Characteristics of spherical MCM-41 evaluated nitrogen adsorption/desorption isotherm and X-ray diffraction. Morphological studies also performed scanning transmission electron microscopy. Conversion molecular weight evaluations carried out using gas size exclusion chromatography respectively. Addition 3 wt% results a decrease conversion from 89 to 53%. Similar reduction behavior is observed for the nanocomposites. However, polydispersity indices (PDI) values increase 1.42 2.07 only addition nanoparticles. A peak around 4.1 ppm which originates hydrogen terminal units polymer chains 1H NMR spectra combination with low PDI can appropriately demonstrate living nature Thermogravimetric analysis shows that thermal stability higher than neat increases increasing content. Glass transition temperature decreases loading as revealed differential calorimetry results.
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