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Preparation of polysaccharide-coated nanoparticles by emulsion polymerization of styrene

Preparation of polysaccharide-coated nanoparticles by emulsion polymerization of styrene It is the aim of this paper to describe the preparation of polysaccharide-coated nanoparticles by direct emulsion polymerization of styrene in the presence of native dextran. In spite of the lack of surface-active properties of native dextran, stable latexes with very low amount of coagulate were obtained. Particle size decreased with dextran concentration and molecular weight. The amount of permanently adsorbed dextran was determined by direct titration of the polysaccharide present on the surface of the nanoparticles. A maximum value of 2.5 mg m−2 was found. Zeta-potential measurements allowed us to estimate the thickness of the hydrophilic layer, which regularly increased with dextran aqueous concentration. The dextran-coated polystyrene nanoparticles were stable in concentrated NaCl solutions and could be redispersed after freeze-drying. The mechanism of chemical modification of dextran was studied by nuclear magnetic resonance and matrix-assisted laser desorption/ionization-time of flight spectrometry studies. Graft copolymers are supposed to be formed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Colloid Polymer Science Springer Journals

Preparation of polysaccharide-coated nanoparticles by emulsion polymerization of styrene

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References (52)

Publisher
Springer Journals
Copyright
Copyright © 2007 by Springer-Verlag
Subject
Chemistry; Polymer Sciences; Soft and Granular Matter, Complex Fluids and Microfluidics; Characterization and Evaluation of Materials; Physical Chemistry; Food Science; Nanotechnology and Microengineering
ISSN
0303-402X
eISSN
1435-1536
DOI
10.1007/s00396-006-1579-3
Publisher site
See Article on Publisher Site

Abstract

It is the aim of this paper to describe the preparation of polysaccharide-coated nanoparticles by direct emulsion polymerization of styrene in the presence of native dextran. In spite of the lack of surface-active properties of native dextran, stable latexes with very low amount of coagulate were obtained. Particle size decreased with dextran concentration and molecular weight. The amount of permanently adsorbed dextran was determined by direct titration of the polysaccharide present on the surface of the nanoparticles. A maximum value of 2.5 mg m−2 was found. Zeta-potential measurements allowed us to estimate the thickness of the hydrophilic layer, which regularly increased with dextran aqueous concentration. The dextran-coated polystyrene nanoparticles were stable in concentrated NaCl solutions and could be redispersed after freeze-drying. The mechanism of chemical modification of dextran was studied by nuclear magnetic resonance and matrix-assisted laser desorption/ionization-time of flight spectrometry studies. Graft copolymers are supposed to be formed.

Journal

Colloid Polymer ScienceSpringer Journals

Published: Jan 19, 2007

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