| Title: | Selective and Quantitative Oxidation of Xanthate End-Groups of RAFT Poly(n-butyl acrylate) Latexes by Ozonolysis |
| Author(s): | Matioszek D; Dufils PE; Vinas J; Destarac M; |
| Address: | "LHFA, UMR CNRS 5069, Universite Paul Sabatier Toulouse III, 118 route de Narbonne, F-31062, Toulouse, Cedex 9, France. High Barrier Polymers, SOLVAY, Avenue de la Republique, F-39500, Tavaux, France. High Barrier Polymers, SOLVAY, Rue de Ransbeek 310, B-1120, Brussels, Belgium. IMRCP, UMR CNRS 5623, Universite Paul Sabatier Toulouse III, 118 route de Narbonne, F-31062, Toulouse, Cedex 9, France" |
| ISSN/ISBN: | 1521-3927 (Electronic) 1022-1336 (Linking) |
| Abstract: | "Although various successful strategies have been reported in the past for the postpolymerization modification of the reversible addition-fragmentation chain transfer (RAFT) terminal group in homogeneous media, no solution is proposed for the tedious case of aqueous polymer dispersions where most of the thiocarbonylthio terminal group is buried into the core of the polymer particle. In this work, ozone is proposed to tackle this important academic and industrial challenge. After preliminary model ozonolysis reactions performed on a xanthate RAFT agent and a derived low molar mass poly(n-butyl acrylate) (PBA) in dichloromethane solution, it is shown that the hydrophobic nature and strong oxidant properties of ozone are responsible for its efficient diffusion in aqueous PBA latex particles obtained by RAFT and selective and complete transformation of the xanthate terminal group into a thiocarbonate end-group. In addition to the beneficial total discoloration of the final product, this chemical treatment does not generate any volatile organic compound and leaves the colloidal stability of the polymer particles unaffected, provided that a PBA latex with a sufficiently high Mn of 5000 g mol(-1) is selected" |
| Keywords: | "Acrylates/*chemistry Free Radicals/chemistry Latex/*chemistry Magnetic Resonance Spectroscopy Oxidation-Reduction Ozone/*chemistry Particle Size Polymers/*chemistry Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization controlled/living radical;" |
| Notes: | "MedlineMatioszek, Dimitri Dufils, Pierre-Emmanuel Vinas, Jerome Destarac, Mathias eng Research Support, Non-U.S. Gov't Germany 2015/05/12 Macromol Rapid Commun. 2015 Jul; 36(14):1354-61. doi: 10.1002/marc.201500115. Epub 2015 May 8" |
