Synthesis of styrene–butadiene rubber latex via miniemulsion copolymerization |
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Authors: | Maria-Verena Kohnle Ulrich Ziener Katharina Landfester |
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Institution: | (1) Institute of Organic Chemistry III—Macromolecular Chemistry and Organic Materials, University of Ulm, Albert-Einstein-Allee 11, 89075 Ulm, Germany |
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Abstract: | High-butadiene-level styrene–butadiene rubber latexes up to high solid-contents are synthesized using the miniemulsion process.
It is shown that the miniemulsion polymerization approach offers an efficient heterophase route synthesizing styrene–butadiene
copolymer latexes with flexible copolymer composition and narrow size distribution of the resulting latex particles. Secondary
nucleation was successfully prevented by using a hydrophobic initiator. Due to the nanoreactor situation, even at high conversions,
a low crosslinking degree and, therefore, low gel contents are obtained. The microstructure of the polymers obtained in miniemulsion
is independent of the synthesis parameters, especially the temperature. The molecular weight can be easily adjusted by the
application of transfer agents while the insoluble gel content is substantially reduced. An up-scaling of the procedure is
easily possible. |
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Keywords: | Miniemulsion Butadiene Copolymers Latex |
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