Well-Defined Synthesis of Crosslinkable Polyester by Living Anionic Alternating Copolymerization of Ethylphenylketene with 4-Allyloxybenzaldehyde

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A Living anionic alternating copolymerization of ethylphenylketene (EPK) with 4-Allyloxybenzaldehide (ABA) was achieved. When n-butyllithium was added to a mixture of EPK and ABA in tetrahydrofuran at-40°C in the presence of excess amount of lithium chloride, the copolymerization of these monomers proceeded via complete 1 : 1 alternating manner to afford the polyester with a narrow polydispersity. A linear relationship was observed between the molecular weight and the monomer/initiator ratio keeping a narrow polydispersity. These observations along with the successful results in two-stage polymerization indicated that the present copolymerization proceeded through a living mechanism. The incorporated allyl group could be oxidized to afford the polyester having epoxy side chain.
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