Effect of transfer agent, temperature and initial monomer concentration on branching in poly(acrylic acid): A study by ¹³C NMR spectroscopy and capillary electrophoresis

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dc.contributor.authorLena JB
dc.contributor.authorGoroncy AK
dc.contributor.authorThevarajah JJ
dc.contributor.authorManiego AR
dc.contributor.authorRussell GT
dc.contributor.authorCastignolles P
dc.contributor.authorGaborieau M
dc.date.accessioned2017-08-07T00:05:17Z
dc.date.available2017-08-07T00:05:17Z
dc.date.issued2017en
dc.date.updated2017-07-04T02:17:56Z
dc.description.abstractBranching has been investigated in poly(acrylic acid) synthesized by conventional radical polymerization with and without chain transfer agent (CTA) at different temperatures and initial monomer concentrations. The average number of branches per monomer unit (i.e. degree of branching) was quantified by solution-state ¹³C NMR spectroscopy. The heterogeneity of branching (dispersity of the electrophoretic mobility distributions) was measured by capillary electrophoresis in the critical conditions (CE-CC). The degree of branching (DB) increases with the reaction temperature due to a rise in the frequency of reactions leading to branches, while the heterogeneity of branching remains steady. DB is lower in polymer synthesized with CTA. This decrease is due to either the CTA quenching the mid-chain radicals or a reduction of the rate of chain transfer to polymer relative to (chain-end) propagation. No influence of initial monomer concentration on DB and on the heterogeneity of branching was observed.en
dc.identifier.citationLena JB, Goroncy AK, Thevarajah JJ, Maniego AR, Russell GT, Castignolles P, Gaborieau M (2017). Effect of transfer agent, temperature and initial monomer concentration on branching in poly(acrylic acid): A study by ¹³C NMR spectroscopy and capillary electrophoresis. Polymer (United Kingdom). 114. 209-220.en
dc.identifier.doihttps://doi.org/10.1016/j.polymer.2017.01.030
dc.identifier.issn0032-3861
dc.identifier.issn1873-2291
dc.identifier.urihttp://hdl.handle.net/10092/13775
dc.language.isoen
dc.rightsCreative Commons Attribution Non-Commercial No Derivatives Licenseen
dc.subjectCapillary electrophoresisen
dc.subjectSolution-state NMR spectroscopyen
dc.subjectBranchingen
dc.subject.anzsrcFields of Research::34 - Chemical sciences::3401 - Analytical chemistry::340101 - Analytical spectrometryen
dc.subject.anzsrcFields of Research::34 - Chemical sciences::3401 - Analytical chemistry::340103 - Electroanalytical chemistryen
dc.subject.anzsrcFields of Research::34 - Chemical sciences::3403 - Macromolecular and materials chemistry::340306 - Polymerisation mechanismsen
dc.titleEffect of transfer agent, temperature and initial monomer concentration on branching in poly(acrylic acid): A study by ¹³C NMR spectroscopy and capillary electrophoresisen
dc.typeJournal Articleen
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