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Synthesis of Narrowly Distributed ω ‐Telechelic Hyperbranched Polyethylenes by Efficient End‐Capping of Pd‐Diimine‐Catalyzed Ethylene “Living” Polymerization with Styrene Derivatives
Author(s) -
Li Shiyun,
Ye Zhibin
Publication year - 2010
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201000196
Subject(s) - diimine , cationic polymerization , polymer chemistry , styrene , polymerization , polyethylene , ethylene , chemistry , copolymer , living polymerization , catalysis , quenching (fluorescence) , organic chemistry , polymer , radical polymerization , physics , quantum mechanics , fluorescence
We report herein a quantitative end‐capping chemistry for the efficient synthesis of monotelechelic hyperbranched polyethylenes containing various ω‐end functionalities by quenching Pd‐diimine catalyzed ethylene “living” polymerization with styrene derivatives. This chemistry utilizes the unique reaction of styrene derivatives with cationic Pd‐diimine species to form stable π‐benzyl intermediate complexes, which are inactive for ethylene polymerization. In the synthesis, “living” hyperbranched polyethylene chains were grown with a Pd‐diimine catalyst. Subsequent end‐quenching of the “living” chains with three styrene derivatives renders narrowly distributed telechelic hyperbranched polyethylenes containing different functional ω ‐terminal groups.