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Polyester Obtained by Anionic Polymerization of Ethylketene
Author(s) -
Hayki Najib,
Desilles Nicolas,
Burel Fabrice
Publication year - 2011
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.201000688
Subject(s) - polymer chemistry , polymerization , monomer , copolymer , polyester , anionic addition polymerization , chemistry , polymer , thermal stability , living polymerization , chain transfer , radical polymerization , organic chemistry
Aldoketenes are well known to undergo fast dimerization and trimerization even at low temperatures but have never been polymerized so far. For the first time, ethylketene, synthesized following the Staudinger procedure modified by McCarney, was polymerized anionically in THF with various initiators, at different temperatures (–40 and –78 °C), and with several monomer/initiator ratios. The resulting polymer was composed exclusively of polyester units, and the initiator did not affect the stereoregularity. Molecular weights up to 24 000 g · mol −1 were obtained with lithium‐based initiators. Transfer reactions and the failure to make block copolymers highlighted a non‐living polymerization. T g values around –18 °C and thermal stability up to 160 °C were measured.