Artículos de revistas
Modification Of Natural Rubber: A Study By 1h Nmr To Assess The Degree Of Graftization Of Polydmaema Or Polymma Onto Rubber Particles Under Latex Form In The Presence Of A Redox Couple Initiator
Registro en:
European Polymer Journal. , v. 41, n. 8, p. 1883 - 1892, 2005.
143057
10.1016/j.eurpolymj.2005.02.030
2-s2.0-20344388277
Autor
Carlos De Oliveira P.
Marim De Oliveira A.
Garcia A.
Carlos De Souza Barboza J.
Amelia De Carvalho Zavaglia C.
Martins Dos Santos A.
Institución
Resumen
On the basis of the proposal that cumene hydroperoxide (CHP) in the presence of the base tetraethylenepentamine (TEPA) can form radicals by the abstraction reaction over addition to allylic double bonds, the efficiency of grafting monomers of methyl methacrylate (MMA) and dimethylaminoethylmethacrylate (DMAEMA) on to natural rubber (NR) has been studied. Seeded emulsion polymerization was used to graft such monomers. Different concentrations of each monomer have been examined. The effects of the concentrations of the monomers were evaluated by 1H NMR spectroscopy and Transmission Electron Microscopy (TEM). There is good evidence for the formation of graft copolymers of modified NR under the core-shell morphology as well as satisfactory efficiency of grafting in the presence of high concentrations of both monomers. At lower concentrations the grafting were not significant. 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