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Living bimetallic initiators for the preparation of triblock copolymers
Author(s) -
Novak Bruce M.,
Deming Timothy J.
Publication year - 1994
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.19940770142
Subject(s) - copolymer , polybutadiene , polymer chemistry , materials science , monomer , polymerization , differential scanning calorimetry , gel permeation chromatography , polymer , living polymerization , bimetallic strip , catalysis , chemistry , radical polymerization , organic chemistry , physics , composite material , thermodynamics
The compound [(η‐C 3 H 5 )Ni(OC(O)CF 3 )] 2 ( I ), which has been used extensively as a butadiene polymerization catalyst and more recently as an isocyanide polymerization catalyst, has been successfully used in the preparation of polyisocyanide ‐ polybutadiene block copolymers. Since both monomer polymerizations are living, this block copolymer synthesis is highly versatile with respect to polymer segment chain lengths and the types of monomers used. Because non‐reciprocal end‐group activities prevent the preparation of triblock copolymers of the type polyisocyanide‐butadiene‐polyisocyanide, bimetallic initiators possessing two allylnickel moieties linked through a central core have been prepared and used to synthesize these desirable triblock copolymers. These materials have been characterized by using gel‐permeation chromatography, differential scanning calorimetry, 13 C NMR and scanning electron microscopy.