Electroinitiated polymerisation of methyl methacrylate mediated by titanium(III)-hydroxylamine redox system : a kinetic study

Methyl methacrylate was polymerized in an aqueous sulphuric acid-methanol medium in a divided cell by an electrolytically generated mediator species titanium(III). Titanium(III)-hydroxylamine sulphate was used as the initiator redox system. The reaction was confined to the cathode compartment and wa...

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Bibliographic Details
Published inPolymer (Guilford) Vol. 41; no. 20; pp. 7381 - 7389
Main Authors YASHODA, M. P, SHERIGARA, B. S, VENKATESWARAN, G
Format Journal Article
LanguageEnglish
Published Oxford Elsevier 01.09.2000
Subjects
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
Solvent effect
Hydroxylamine
Redox polymerization
Priming activity
Reaction mechanism
Kinetics
Experimental study
Reaction rate
Activation energy
Titanium III
Redox catalyst
Solution polymerization
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Summary:Methyl methacrylate was polymerized in an aqueous sulphuric acid-methanol medium in a divided cell by an electrolytically generated mediator species titanium(III). Titanium(III)-hydroxylamine sulphate was used as the initiator redox system. The reaction was confined to the cathode compartment and was found to proceed via a free radical mechanism. Kinetics of polymerization were investigated for different initial monomer concentrations, acid concentrations, electrical currents, dielectric constants of the solvent and electrode materials. Chain termination of the polymer was due to coupling of growing macroradicals, also a fraction of the termination took place by chain transfer mechanisms involving the organic solvent molecules. A suitable mechanism for titanium(III)-hydroxylamine sulphate mediated indirect electropolymerization of methyl methacrylate has been proposed. (Original abstract)
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0032-3861
1873-2291
DOI:10.1016/S0032-3861(00)00101-4