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Controlled Radical Ab Initio Emulsion Polymerization of n ‐Butyl Acrylate by Reverse Iodine Transfer Polymerization (RITP): Effect of the Hydrolytic Disproportionation of Iodine
Author(s) -
Tonnar Jeff,
LacroixDesmazes Patrick,
Boutevin Bernard
Publication year - 2006
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200600474
Subject(s) - dispersity , emulsion polymerization , polymerization , iodide , polymer chemistry , chemistry , ab initio , acrylate , molar mass distribution , iodine , disproportionation , materials science , organic chemistry , copolymer , polymer , catalysis
Summary: Controlled radical polymerization of n ‐butyl acrylate by reverse iodine transfer polymerization (RITP) was achieved in ab initio emulsion polymerization to yield a stable and uncolored latex (particle diameter d p = 106 nm). Hydrolysis of iodine, I 2 , was responsible for an upward deviation from the targeted molecular weight $\overline M _{{\rm n},{\rm targeted}}$ = 10 400 g · mol −1 . The iodide concentration [I − ] was followed by an iodide selective electrode and the amount of efficient iodine (33%) was successfully correlated with the experimental molecular weight $\overline M _{{\rm n},{\rm exp}}$ = 31 000 g · mol −1 . Finally, a simplified mechanism of RITP in ab initio emulsion polymerization taking into account the iodine hydrolysis was proposed.Evolution of molecular weight and polydispersity index in RITP of BuA in ab initio emulsion.