A New Type of Block Copolymerization with One-Shot Feeding of Two Monomers

摘要

This paper describes a new type of block copolymerization in which a block copolymer is produced with a "one-shot" feeding of monomers. The new block copolymerization is possible when the following prerequisites are met: (ⅰ) polymerization of two monomers proceeds via a living polymerization mechanism with a common initiator, (ⅱ) the reactivities of the two monomers differ significantly from each other, and (ⅲ) the propagating species of the monomer with higher reactivity is able to initiate the polymerization of the other monomer with lower reactivity. This new type of block copolymerization has been achieved by the combination of two monomers which were deliberately selected from among cyclic imino ethers. In addition, utilization of an oxazoline having a cyclic amine substituent at the 2-position as one component in the copolymerization has revealed another interesting phenomenon of this one-shot block copolymerization process, one involving "double isomerization polymerization". The new block copolymerization has conveniently been utilized in the preparation of surface-active agents having excellent performance.