Determination of the Mode of Radical Termination from Pulsed Laser Polymerization Experiments in the Presence of Retardation and Chain Transfer to Agent. Issue 23 (5th September 2013)

• Record Type: Journal Article
• Authors: Nikitin, Anatoly N.; Hutchinson, Robin A.; Hesse, Pascal
• Is Part Of: Macromolecular chemistry and physics. Volume 214:Issue 23(2013:Dec.)
• Page Start: 2670
• Page End: 2682
• Publication Date: 2013-09-05
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201300411
• Languages: English
• ISSNs: 1022-1352

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>The pulsed laser polymerization–high termination rate limit–size‐exclusion chromatography (PLP–HTRL–SEC) technique is used to estimate the mode of termination (<italic>δ</italic>) for <italic>n</italic>‐butyl methacrylate (<italic>n</italic>‐BMA) polymerization at 30 °C. It is found that molecular mass distributions measured in these experiments are influenced by an unknown side reaction such as retardation or chain transfer that results in a marked decrease of intensity of the PLP peak. A new approach is developed to evaluate <italic>δ</italic>, with numerical experiments used to demonstrate the robustness of the methodology in the presence of retardation or chain transfer to agent. Application to the experimental <italic>n‐</italic>BMA polymerization at 30 °C leads to an estimate for <italic>δ</italic> of 0.60 ± 0.03. <boxed-text content-type="graphic" position="anchor" orientation="portrait"><graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pgg3z8rt48w" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></boxed-text></p> </abstract>