Vinyl Polymerization. CDVII. Polymerization of Methyl Methacrylate Initiated by Diphenyldisulfide and Cu(II) Ion

Abstract

ABSTRACT:Radical polymerization of methyl methacrylate (MMA) initiated by diphenyldisulfide (DPDS) and CuC12 was carried out in a mixed solvent of 1,4-dioxane and water. Formerly, we reported 1 that lysozyme having four S-S linkages in a molecule could initiated the polymerization of methyl methacrylate (MMA) in an aqueous solution of CuC1 2 , and concluded that the initiation was consisted of three reactions, that is, (i) a normal "uncatalyzed polymerization" which is a reaction of polypeptide portion of lysozyme with Cu(II) ion, water and MMA, (ii) a generation of free radicals by the reaction of S-S bond with Cu(II) ion, and (iii) a thermal polymerization in MMA phase.The extent of our research indicates that the generation of free radicals by the reaction of S-S bond with Cu(II) ion in the dark is not known. Accordingly, it is necessary to ascertain whether a simple compound having S-S bond can initiate a radical polymerization of MMA in the dark and in the presence of Cu(II) ion. The present paper deals with this kind of polymerization. As a simple disulfide model, diphenyldisulfide (DPDS) was used.

Comparative investigation on radical polymerization of methyl and ethyl methacrylate under multi-site phase-transfer catalytic conditions

“…The comparison of Ea value for different alkyl methacrylate under phase-transfer catalytic polymerization was reported [20,28,29]. The overall activation energy of 72.80 kJ/mol was reported for the polymerization of MMA using diphenyldisulphide and Cu (II) ion system [33].…”

“…The vinyl monomers such as MMA, EMA, n-BMA, styrene and acrylonitrile were polymerized using DPDS and Cu (II) system [33]. Among these monomers, EMA was polymerized easily compared to other monomers.…”