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Highly effective organometallic‐mediated radical polymerization of vinyl acetate using alumina‐supported C o(acac) 2 catalyst: A case study of adsorption and polymerization
Author(s) -
Semsarzadeh Mohammad Ali,
Sabzevari Alireza
Publication year - 2018
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.46057
Subject(s) - polymerization , radical polymerization , polymer chemistry , vinyl acetate , cobalt mediated radical polymerization , chain transfer , chemistry , living free radical polymerization , catalytic chain transfer , living polymerization , polymer , solution polymerization , catalysis , copolymer , organic chemistry
ABSTRACT An alumina support system for cobalt (II) acetylacetonate (Co(acac) 2 ) catalyst was studied for the cobalt‐mediated radical polymerization (CMRP) of vinyl acetate (VAc). We report a simple but efficient technique to produce this supported catalysts through the adsorption of Co(acac) 2 on the surface of alumina particles. Moreover, kinetic and thermodynamic study of Co(acac) 2 adsorption on the alumina support were conducted and the influence of effective parameters were investigated. It was found that using alumina‐supported Co(acac) 2 for radical polymerization of VAc yields polymers with controlled molecular weight, narrow molecular weight distribution, and high purity. For the alumina‐supported CMRP, changing the polymerization mechanism and domination of termination pathway compared to degenerate transfer pathway resulted in a 2.5 times increase in polymerization rate ( k ap ) and a drop in induction time while maintaining a good control of the VAc polymerization. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46057.