Suspension Polymerization Redox Initiators

Ferrocene/ferrocenium redox shuttling: Peroxide decomposition catalysis applied to vinyl monomers polymerization under suspension conditions

“…This has been studied and applied for several decades and usually involves the use of redox systems to react with peroxide, in addition to the thermal decomposition. In most cases, organic or inorganic reductants are added in stoichiometric amounts vs. the peroxide [5], some example being ascorbic acid (AA) and its esters derivatives. As early examples, the use of AA in combination with tert-butyl perbenzoate has been described, which allows the homogeneous polymerization of vinyl acetate in alcoholic medium [6] or that of 6-O-palmitoyl-L-ascorbic acid (PAA) in bulk or suspension polymerization of vinyl chloride with methyl ethyl ketone peroxide [7] or t-butyl peroxyoctoate [8].…”