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Controlled synthesis and solution behavior of macrocyclic poly[(styrene)‐ b ‐(ethylene oxide)] copolymers
Author(s) -
Cramail Sylvie,
Schappacher Michel,
Deffieux Alain
Publication year - 2000
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 - 10.1002/1521-3935(20001101)201:17<2328::aid-macp2328>3.0.co;2-r
Subject(s) - copolymer , ethylene oxide , polymer chemistry , styrene , ethylene , chemistry , amphiphile , oxide , yield (engineering) , styrene oxide , materials science , organic chemistry , catalysis , polymer , metallurgy
A series of cyclic poly[(styrene)‐ b ‐(ethylene oxide)] diblock copolymers 4 (1.5 kg/mol < M n < 1.1 kg/mol) with narrow molecular weight distributions (I ≤ 1.12) have been synthesized. They were obtained by intramolecular cyclization of linear α ‐diethyl acetal‐ ω ‐styrenyl poly(styrene ethylene oxide) 3 , under high dilution conditions. The use of well‐defined linear precursors in association with a cyclization process based on an unimolecular end‐to‐end coupling reaction allows the formation of macrocyclic diblocks in high yield (more than 90%). The structural characterization and the solution behavior of both the linear and cyclic amphipathic diblock copolymers have been investigated by means of NMR, size exclusion chromatography, and viscosimetry.