Preparation of Monodisperse Polystyrene/Clay Nanocomposite Latexes via In Situ Reverse Atom Transfer Radical Polymerization in a Miniemulsion System

Document Type : Research Paper

Authors

1 Department of Chemistry, Amirkabir University of Technology

2 Department of Polymer Engineering and Color Technology, Amirkabir University of Technology

3 Department of Polymer Engineering, Sahand University of Technology

Abstract

Polystyrene latexes with dispersion of nanoclay layers were synthesized by using in situ miniemulsion reverse atom transfer radical polymerization at 90 °C. Final monomer conversion was determined by employing gravimetric method and droplet and particle size distributions were obtained by using dynamic light scattering (DLS) analysis. Also, the number- and weight- average molecular weight and polydispersity index of the nanocomposites were evaluated by using GPC. It was found out that the PDI value of the neat polystyrene is lower than that of the polystyrene chains extracted from the nanocomposites; PDI rose by increasing nanoclay content in the polymer matrix. The XRD results indicated that clay layers were dispersed in the polystyrene matrix and therefore exfoliated nanocomposites were formed. The successful formation of polystyrene chains and their living nature were demonstrated by FTIR spectra. The living nature of the polymerization was also confirmed by the HNMR results. The SEM micrograph presents the monodisperse distribution of spherical particles with sizes in the range of around 200 nm in the nanocomposite containing 1 wt% of nanoclay

Keywords

References

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Journal of Petroleum Research
Volume 22, Issue 71 - Serial Number 71
November and December 2012
Pages 14-27

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