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The cationic polymerization of 2, 4, 6‐trimethylstyrene: from “truly living” to “controlled” polymers?
Author(s) -
Vairon J.P.,
Moreau M.,
Charleux B.,
Cretol A.,
Faust R.
Publication year - 2002
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200207)183:1<43::aid-masy43>3.0.co;2-s
Subject(s) - cationic polymerization , polymerization , dichloromethane , dispersity , polymer , polymer chemistry , ionization , chemistry , chloride , ion , organic chemistry , solvent
The cationic polymerization of 2,4,6‐trimethylstyrene in dichloromethane was initiated by the corresponding chloride with GaCl 3 and BCl 3 as Lewis acids. With GaCl 3 , the initiator, as well as the propagating ends, are fully ionized. The resulting cation appears stable from −70 to −30°C, leading to “truly living” polymers. With BCl 3 , the ionization is very low and the ionization constant Ki was determined (2.9 10 −3 L. mol −1 at −70°C). In this case the polymerization appears perfectly “controlled”, with a good agreement between Mn th and Mn exp (up to 80000 mol.g −1 ) and a very narrow polydispersity. A propagation rate constant kp app = 8500 mol. L. mol −1 .s −1 was estimated at −70°C.