Abstract
AbstractThe compound [(η‐C3H5)Ni(OC(O)CF3)]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, 13C NMR and scanning electron microscopy.
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