Electroinitiated polymerisation of methyl methacrylate mediated by titanium(III)-hydroxylamine redox system

A kinetic study

M. P. Yashoda, B. S. Sherigara, G. Venkateswaran

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Methyl methacrylate was polymerised 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 polymerisation 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 mechanism involving the organic solvent molecules. A suitable mechanism for titanium(III)-hydroxylamine sulphate mediated indirect electropolymerisation of methyl methacrylate has been proposed. (C) 2000 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)7381-7389
Number of pages9
JournalPolymer
Volume41
Issue number20
DOIs
Publication statusPublished - 09-2000

Fingerprint

Hydroxylamine
Methacrylates
Titanium
Polymerization
Sulfates
Kinetics
Acids
Electropolymerization
Free radicals
Organic solvents
Free Radicals
Methanol
Polymers
Cathodes
Permittivity
Monomers
Electrodes
Molecules
Oxidation-Reduction

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry

Cite this

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abstract = "Methyl methacrylate was polymerised 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 polymerisation 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 mechanism involving the organic solvent molecules. A suitable mechanism for titanium(III)-hydroxylamine sulphate mediated indirect electropolymerisation of methyl methacrylate has been proposed. (C) 2000 Elsevier Science Ltd. All rights reserved.",
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Electroinitiated polymerisation of methyl methacrylate mediated by titanium(III)-hydroxylamine redox system : A kinetic study. / Yashoda, M. P.; Sherigara, B. S.; Venkateswaran, G.

In: Polymer, Vol. 41, No. 20, 09.2000, p. 7381-7389.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Electroinitiated polymerisation of methyl methacrylate mediated by titanium(III)-hydroxylamine redox system

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AU - Yashoda, M. P.

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AB - Methyl methacrylate was polymerised 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 polymerisation 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 mechanism involving the organic solvent molecules. A suitable mechanism for titanium(III)-hydroxylamine sulphate mediated indirect electropolymerisation of methyl methacrylate has been proposed. (C) 2000 Elsevier Science Ltd. All rights reserved.

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