Polystyrene–organoclay nanocomposites produced by in situ activators regenerated by electron transfer for atom transfer radical polymerization
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Khezrollah Khezri
,
Hossein Roghani-Mamaqani
Abstract
A newly developed initiation system, activators regenerated by electron transfer (ARGET), was employed to synthesize polystyrene-organoclay nanocomposites via atom transfer radical polymerization (ATRP). ARGET ATRP was applied since it is carried out at significantly low concentrations of the catalyst and environmentally acceptable reducing agents. Conversion and molecular weight evaluations were performed using gravimetry and size exclusion chromatography (SEC), respectively. According to the findings, addition of clay content resulted in a decrease in conversion and molecular weight of nanocomposites. However, an increase of polydispersity index is observed by increasing nanoclay loading. The living nature of the polymerization is revealed by 1H NMR spectroscopy and extracted data from the SEC traces. X-ray diffraction (XRD) analysis shows that organoclay layers are disordered and delaminated in the polymer matrix and exfoliated morphology is obtained. Thermogravimetric analysis (TGA) shows that thermal stability of the nanocomposites is higher than the neat polystyrene. A decrease in glass transition temperature of the samples by increasing organoclay content is observed by differential scanning calorimetry (DSC). Transmission electron microscopy (TEM) reveals that clay layers are partially exfoliated in the polymer matrix containing 2 wt% of organomodified montmorillonite (PSON 2) and a dispersion of partially exfoliated clay stacks is formed.
©2012 by Walter de Gruyter Berlin Boston
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Artikel in diesem Heft
- Masthead
- Masthead
- Masthead
- Original Articles
- Evaluation of factors and kinetics study of polyacrylamide redox polymerization using statistical design modeling
- Gel filtration chromatography analysis and modeling the process of pullulan depolymerization
- Polystyrene–organoclay nanocomposites produced by in situ activators regenerated by electron transfer for atom transfer radical polymerization
- Viscoelasticity in thermoforming
- Melt extrudate swell behavior of polypropylene composites filled with hollow glass beads
- Viscosity and domain morphology in binary immiscible blends of poly(trimethylene terephthalate) and polyamide6,10
- Effect of poly (methyl methacrylate)-grafted-talc content on mechanical properties and thermal degradation of poly (vinyl chloride) composites
- Fabrication and properties of poly(L-lactide)/hydroxyapatite/chitosan fiber ternary composite scaffolds for bone tissue engineering
- Green composites based on recycled polyamide-6/recycled polypropylene kenaf composites: mechanical, thermal and morphological properties
- Effect of gamma radiation and bulk monomer on jute fabrics polyethylene/polyvinyl chloride composites
- Investigation of fracture toughness parameters of epoxy nanocomposites for different crack angles
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