Supported cobalt mediated radical polymerization (SCMRP) of vinyl acetate and recycling of the cobalt complex

Abstract

Cobalt complexes supported on silica and Merrifield resin are effective mediators for the controlled radical polymerization of vinyl acetate.

Asymmetric zinc(ii) complexes as functional and structural models for phosphoesterases

“…The immobilisation of complexes on inorganic or organic supports has been extensively explored and modified silica, organic resins such as Tentagel or Merrifield resin and other polymers have served previously as supports. 19,20 Merrifield resin attached complexes have been reported useful for various applications such as Ni(II) catalysed cross coupling reactions, 21 the oxidative DNA cleavage catalysed by an immobilised cyclen Cu(II), 20 Pd(II) catalysed Suzuki-Miyaura cross-coupling reactions, 19 salen Mn(II) complexes for epoxidation reactions, 22 and the Co(II) catalysed polymerisation of vinyl acetate, 23 to list a few examples. The advantage of the immobilised system is that the complex can be easily separated from the reaction mixture and the loaded resin recycled.…”

Immobilization of GpdQ and Related Models for Bioremedial Applications

“…Modified silica, organic resins such as Tentagel or Merrifield resin and other polymers have served as supports. Merrifield resinattached complexes have been reported to be useful for various applications such as Ni(II) catalyzed cross coupling reactions [15], the oxidative DNA cleavage catalyzed by an immobilized cyclen Cu(II) [16], Pd(II) catalyzed Suzuki-Miyaura cross-coupling reactions [17], salen Mn(II) complexes for epoxidation reactions [18] or the Co(II) catalyzed polymerization of vinyl acetate [19]. The advantage is that the complex can be easily separated from the reaction mixture and the complex loaded resin can be recycled.…”

Selective and Quantitative Oxidation of Xanthate End-Groups of RAFT Poly(n-butyl acrylate) Latexes by Ozonolysis

“…Indeed, not only can traces of metal catalysts be an obstacle for many fields of application, but also the chemical, thermal, and sometimes photo‐instability of the polymer end‐group can lead to the formation and release of low molar mass, potentially hazardous organic volatile compounds during the lifetime of the polymer. What is true for the transition metal complex and halide end‐group in ATRP is also valid for the organocobalt end‐group in cobalt‐mediated radical polymerization (CMRP), telluride compounds in organotellurium‐mediated radical polymerization (TERP), iodine in iodine transfer polymerization (ITP), and thiocarbonylthio terminal group in polymers produced by reversible addition‐fragmentation chain transfer (RAFT) polymerization . Although various efficient strategies for the removal/transformation of chain ends of RDRP polymers have been proposed for polymers in solution, there is to date no report of efficient treatment for polymer dispersions to the best of our knowledge.…”

“…What is true for the transition metal complex and halide end‐group in ATRP is also valid for the organocobalt end‐group in cobalt‐mediated radical polymerization (CMRP), telluride compounds in organotellurium‐mediated radical polymerization (TERP), iodine in iodine transfer polymerization (ITP), and thiocarbonylthio terminal group in polymers produced by reversible addition‐fragmentation chain transfer (RAFT) polymerization . Although various efficient strategies for the removal/transformation of chain ends of RDRP polymers have been proposed for polymers in solution, there is to date no report of efficient treatment for polymer dispersions to the best of our knowledge. This missing link between RDRP technologies and the latex industry is a worthy target, bearing in mind the numerous fields of applications for aqueous polymer dispersions such as paints and coatings, adhesives, construction materials, and biomedicine.…”