Miniemulsion polymerization templates: A systematic comparison between low energy emulsification (Near-PIT) and ultrasound emulsification methods

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TitreMiniemulsion polymerization templates: A systematic comparison between low energy emulsification (Near-PIT) and ultrasound emulsification methods
Type de publicationJournal Article
Nouvelles publications2011
AuteursGalindo-Alvarez J, Boyd D, Marchal P, Tribet C, Perrin P, Marie-Begue E, Durand A, Sadtler V
JournalColloids and Surfaces a-Physicochemical and Engineering Aspects
Volume374
Pagination134-141
Résumé

Poly(ethylene oxide)-covered polystyrene nanoparticles were prepared by free radical miniemulsion polymerization after using an original low energy emulsification procedure called Near-PIT method. This procedure consisted in heating the initial monomer emulsion up to a temperature close to the phase inversion temperature (PIT) but lower. The surfactants used were commercial Brij (R) 78 and Brij (R) 700 and mixtures of both. The Near-PIT method was showed to allow the preparation of nanoparticle suspensions with average diameters lower than 100 nm and solid contents higher than 20 wt% while avoiding heating the initial monomer emulsion above PIT like in usual low energy methods. The influences of various formulation and operating parameters were investigated. Finally, the Near-PIT method was compared to other well-known procedures for nanoparticle preparation, miniemulsion polymerization after ultrasound emulsification and macroemulsion polymerization under mechanical agitation. The performances of Near-PIT procedure were comparable to ultrasound emulsification. (C) 2010 Elsevier B.V. All rights reserved.

Unité de rattachement: 
UMR 8640