Synthesis and rheological characterization of latexes stabilized by methacrylic acid containing macromonomers

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Synthesis and rheological characterization of latexes stabilized by methacrylic acid containing macromonomers
Title:
Synthesis and rheological characterization of latexes stabilized by methacrylic acid containing macromonomers
Journal Title:
Industrial & Engineering Chemistry Research
Keywords:
Publication Date:
26 August 2019
Citation:
Schreur-Piet, I.; Herk, A. M. V.; Laven, J.; Heuts, J. P. A., Synthesis and rheological characterization of latexes stabilized by methacrylic acid containing macromonomers. Industrial & Engineering Chemistry Research 2019, 58 (46), 21105-21117.
Abstract:
A range of copolymers of methacrylic acid (MAA) macromonomers prepared by cobalt-catalyzed chain transfer and methyl methacrylate (MMA) and/or butyl acrylate (BA) was synthesized and used as a stabilizer in the emulsion polymerization of MMA. Although clear differences were observed in polymerization rates using the different MAAx-MMAy stabilizers, these differences were not as clearly reflected in the particle sizes nor in the rates per particle. However, a clear difference between these systems and those stabilized by MAAx-BAy was observed. The latter systems were all characterized by much smaller particle sizes and corresponding higher rates of polymerization. In addition, the molar masses in the latter systems were all significantly larger than those obtained in the MAAx-MMAy stabilized system, in which the stabilizers act as “sulfur-free” RAFT agents. Interestingly, the prepared latexes showed a range of appearances varying from “milky” to “gel-like” depending on the used stabilizer. The MAAx-BAy stabilized latexes had, in general, a lower viscosity and a significantly smaller (if any) yield stress than the MAAx-MMAy stabilized latexes, and in the latter case the rheological behavior was found to depend on the block lengths in and concentration of the stabilizer.
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Funding Info:
This work was partially funded by the Stichting Emulsion Polymerization.
Description:
This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in Industrial & Engineering Chemistry Research, copyright© American Chemical Society after peer review. To access the final edited and published work see https://doi.org/10.1021/acs.iecr.9b02794.
ISSN:
0888-5885
1520-5045
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