Identification and Count of the Active Sites in Olefin Polymerization Catalysis by Oxygen Quench. Issue 18 (1st July 2014)

• Record Type: Journal Article
• Authors: Cipullo, Roberta; Mellino, Simona; Busico, Vincenzo; Sun, Wen‐Hua
• Is Part Of: Macromolecular chemistry and physics. Volume 215:Issue 18(2014:Sep.)
• Page Start: 1728
• Page End: 1734
• Publication Date: 2014-07-01
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201400156
• Languages: English
• ISSNs: 1022-1352

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>A simple method for the counting and structural elucidation of the different active sites in an olefin polymerization catalyst system is introduced, based on a reaction quench by O₂ under controlled kinetics, followed by NMR analysis of the OH‐labeled chain end‐groups formed upon acidic work‐up of the polymer. The method is successfully benchmarked using a molecular bis(phenoxyamino)Zr(IV)‐based catalyst characterized by a comparatively long‐lasting controlled kinetic transient at room temperature. <boxed-text content-type="graphic" position="anchor" orientation="portrait"><graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pgh1f9sm42g" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></boxed-text></p> </abstract>