Synthesis and morphology of an iron oxide/polystyrene/ poly(isopropylacrylamide-co-methacrylic acid) thermosensitive magnetic composite latex with potassium persulfate as the initiator
Journal
Journal of Polymer Science, Part A: Polymer Chemistry
Journal Volume
45
Journal Issue
14
Pages
3062-3072
Date Issued
2007
Author(s)
Abstract
In this work, an iron oxide (Fe3O4)/polystyrene (PS)/poly(N-isopropylacrylamide-co-methacrylic acid) [P(NIPAAM-MAA)] thermosensitive magnetic composite latex was synthesized by the method of two-stage emulsion polymerization. The Fe3O4 particles were prepared by a traditional coprecipitation method and then surface-treated with either a PAA oligomer or lauric acid to form a stable ferrofluid. The first stage for the synthesis of the thermosensitive magnetic composite latex was to synthesize PS in the presence of a ferrofluid by emulsion polymerization to form Fe3O4/PS composite latex particles. Following the first stage of reaction, the second stage of polymerization was carried out with N-isopropylacryl amide and methacrylic acid as monomers and with Fe 3O4/PS latex as seeds. The Fe3O 4/PS/[P(NIPAAM-MAA)] thermosensitive magnetic particles were thus obtained. The effects of the ferrofluids on the reaction kinetics, morphology, and particle size of the latex were discussed. A reaction mechanism was proposed in accordance with the morphology observation of the latex particles. The thermosensitive property of the thermosensitive magnetic composite latex was also studied. © 2007 Wiley Periodicals, Inc.
Type
journal article