Synthesis and morphology of Fe3O4/polystyrene/ poly(isopropylacrylamide-co-methyl acrylate acid) magnetic composite latex - 2,2′-azobis (2-methylpropionamidine) dihydrochloride as initiator
Journal
Journal of Polymer Science, Part A: Polymer Chemistry
Journal Volume
45
Journal Issue
17
Pages
3912-3921
Date Issued
2007
Author(s)
Abstract
Abstract In this work, Fe 3 O 4 /polystyrene/poly( N ‐isopropylacryl amide‐ co ‐methylacrylate acid) (Fe 3 O 4 /PS/P(NIPAAM‐ co ‐MAA)) magnetic composite latex was synthesized by the method of two stage emulsion polymerization. In this reaction system, 2,2′‐azobis(2‐methyl propionamidine) dihydrochloride (AIBA) was used as initiator to initiate the first stage reaction and second stage reaction. The Fe 3 O 4 particles were prepared by a traditional coprecipitation method. Fe 3 O 4 particles were surface treated by either PAA oligomer or lauric acid to form the stable ferrofluid. The first stage for the synthesis of magnetic composite latex was to synthesize PS in the presence of ferrofluid by soapless emulsion polymerization to form the Fe 3 O 4 /PS composite latex particles. Following the first stage of reaction, the second stage of polymerization was carried out by the method of soapless emulsion polymerization with NIPAAM and MAA as monomers and Fe 3 O 4 /PS latex as seeds. The magnetic composite particles, Fe 3 O 4 /PS/P(NIPAAM‐ co ‐MAA), were thus obtained. The mechanism of the first stage reaction and second stage reaction were investigated. Moreover, the effects of PAA and lauric acid on the reaction kinetics, morphology, and particle size distribution were studied. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 3912–3921, 2007
Type
journal article