Silica gel supported co(acac)2 catalyst in the controlled radical polymerization of vinyl acetate: an easy and practical method to make crystallized poly(vinyl acetate) in a one step process

Silica gel supported co(acac)2 catalyst in the controlled radical polymerization of vinyl... Cobalt-mediated radical polymerization (CMRP) of vinyl acetate (VAc) has been suggested as one of the major methods to reduced some of the problems in the synthesis of Poly(vinyl acetate) (PVAc), but the color impurities have been the major disadvantage of this method. An easy and practical method to make a crystallized PVAc in a one step process is to use silica gel particles. The particles have been used as a catalyst support of cobalt(II) acetylacetonate (Co(acac)2). It was found that using silica gel supported-Co(acac)2 in VAc polymerization yields polymers with controlled molecular weight, narrow molecular weight distribution, and high purity. For the silica gel supported CMRP (SS-CMRP) changing the polymerization mechanism resulted in a 2.5 times increase in polymerization rate (kapp) and a drop in the induction time while maintaining the control of the VAc polymerization. In addition PVAc synthesized through SS-CMRP method compared to the one synthesized using unsupported-CMRP has a higher crystallinity. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Polymer Research Springer Journals

Silica gel supported co(acac)2 catalyst in the controlled radical polymerization of vinyl acetate: an easy and practical method to make crystallized poly(vinyl acetate) in a one step process

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Publisher
Springer Journals
Copyright
Copyright © 2017 by Springer Science+Business Media B.V.
Subject
Chemistry; Polymer Sciences; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials
ISSN
1022-9760
eISSN
1572-8935
D.O.I.
10.1007/s10965-017-1328-y
Publisher site
See Article on Publisher Site

Abstract

Cobalt-mediated radical polymerization (CMRP) of vinyl acetate (VAc) has been suggested as one of the major methods to reduced some of the problems in the synthesis of Poly(vinyl acetate) (PVAc), but the color impurities have been the major disadvantage of this method. An easy and practical method to make a crystallized PVAc in a one step process is to use silica gel particles. The particles have been used as a catalyst support of cobalt(II) acetylacetonate (Co(acac)2). It was found that using silica gel supported-Co(acac)2 in VAc polymerization yields polymers with controlled molecular weight, narrow molecular weight distribution, and high purity. For the silica gel supported CMRP (SS-CMRP) changing the polymerization mechanism resulted in a 2.5 times increase in polymerization rate (kapp) and a drop in the induction time while maintaining the control of the VAc polymerization. In addition PVAc synthesized through SS-CMRP method compared to the one synthesized using unsupported-CMRP has a higher crystallinity.

Journal

Journal of Polymer ResearchSpringer Journals

Published: Oct 3, 2017

References

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