COLL 362 |
| Syuji Fujii1, David Randall2, Javier I. Amalvy1, and Steven P. Armes1. (1) Department of Chemistry, School of Life Sciences, University of Sussex, Falmer, BN1 9QJ, Brighton, United Kingdom, (2) Department of Biology, School of Life Sciences, University of Sussex, Falmer, BN1 9QJ, Brighton |
| Stimulus-sensitive polymer particles are considered to have many potential applications in medicine, biotechnology and environmental remediation. Recently we showed that submicrometer-sized, sterically-stabilised polystyrene (PS) latex particles can act as pH-responsive particulate emulsifiers for the stabilization of oil-in-water emulsions (J. I. Amalvy et al. Chem. Commun., 2003). The PS particles were produced by dispersion polymerisation in a methanol/water mixture in the presence of a poly[2-(dimethylamino)ethyl methacrylate-block-methyl methacrylate] diblock copolymer, which was prepared by group transfer polymerisation. In the present study, submicrometer-sized, near-monodisperse PS/poly[2-(dimethylamino)ethyl methacrylate-stat-ethylene glycol dimethacrylate] [PS/P(DMA-EGDMA)] core/shell latexes were synthesized by free radical emulsion polymerisation using PS seed particles. Using these PS/P(DMA-EGDM) latexes as Pickering-type particulate emulsifiers, n-dodecane-in-water emulsions were readily prepared at pH 8. These emulsions were characterised in terms of their particle size using a Malvern Mastersizer and optical microscopy. Lowering the solution pH leads to rapid demulsification, which demonstrates the stimulus-responsive nature of these new latex-based emulsifiers. |
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“Smart” Polymers on Surfaces and Colloids
2:00 PM-5:20 PM, Tuesday, March 30, 2004 Marriott -- Grand Ballroom J, Oral
Division of Colloid and Surface Chemistry |