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Semi-batch synthesis of colloidal spheres with fluorinated cores and varying grafts of poly(ethylene glycol)

Journal article
Authors Kristin Jonsson
Jeanette Ulama
Malin Johansson
Malin Zackrisson Oskolkova
Johan Bergenholtz
Published in Colloid and Polymer Science
Volume 295
Issue 10
Pages 1983-1991
ISSN 0303-402X
Publication year 2017
Published at Department of Chemistry and Molecular Biology
Pages 1983-1991
Language en
Links dx.doi.org/10.1007/s00396-017-4172-...
https://link.springer.com/article/1...
https://gup.ub.gu.se/file/207045
Keywords Crosslinking, Emulsion polymerization, Fluorinated colloids, Monodisperse spheres, PEG, SAXS
Subject categories Physical Chemistry, Polymer Chemistry, Materials Chemistry, Surface and colloid chemistry

Abstract

Fluorinated spheres with grafted poly(ethyleneglycol) (PEG) have been synthesized using a semi-batch emulsion polymerization in which the initiator is fed slowly to the reaction. In this way, PEG-grafted colloidal spherescan be fabricated with varying PEG chain length, different cores and varying degrees of crosslinking. The resulting batches have been characterized using disc centrifuge photo-sedimentometry and small-angle X-ray scattering. The size distribution is shown to be a sensitive function of the molar ratio of the reactive PEG macromonomer to fluorinated monomer, and with some optimization latices of very low polydispersity can be obtained with this simple synthesis method. For short PEG grafts too high a molar ratio results in a build up of smaller size particles and a broadening of the size distribution, whereas for longer grafts the mean particle size increases with decreasing molar ratio.

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