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Block Copolymers by high temperature oligomer‐coupling reactions: Bis(5‐oxazolinone)/OH reaction
Author(s) -
Lefébvre Hervé,
Fradet Alain
Publication year - 1997
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/masy.19971220106
Subject(s) - oligomer , copolymer , polymer chemistry , molar mass , polyester , polyamide , catalysis , coupling reaction , polymer , materials science , telechelic polymer , chemistry , organic chemistry , end group
High temperature chain‐coupling reactions in the bulk between amino‐, hydroxy‐ or carboxy‐terminated polymers and various coupling agents have been studied and applied to the synthesis of copolymers with aliphatic polyester, polyether or polyamide blocks. Thus, carboxy‐terminated oligomers can be coupled by bisoxazolines or bisimidazolines, while 4‐substituted and 4, 4‐disubstituted bis(5‐oxazolinones) are efficient coupling agents for amino‐ or hydroxy‐terminated oligomers. In the latter case, the use of a catalyst is necessary. The reaction has been optimized using a series of bisoxazolinones deriving from α‐amino‐acids and 1‐dodecanol and α, ω‐dihydroxy‐poly(ϵ‐caprolactone) as model compounds. High molar mass poly‐ϵ‐caprolactone containing α‐aminoacid moieties has been obtained in the presence of tetrabutoxytitanium as a catalyst.