NOVEL ABA TRIBLOCK AND DIBLOCK COPOLYMERS AND METHODS OF PREPARING THE SAME

摘要

The invention discloses a method for preparing a triblock copolymer of formula (I) comprising: (a) contacting a cycloalkene with a chain transfer agent of the formula: Z-Y=Y-Z in the presence of a metal carbene metathesis catalyst to form a telechelic polymer; and (d) contacting the telechelic polymer with an alkene of formula (II) in the presence of an ATRP organometallic catalyst wherein n and m are integers; Z is an ATRP initiator and -Y=Y- is an alkenyl group; and, R' is selected from the group consisting of aryl, nitrile and C1-C20 carboxylate, wherein R' is substituted or unsubstituted. The invention also discloses a method for preparing a diblock copolymer. In addition, the invention encompasses a triblock copolymer having no 1,2-PBD structure in the PBD portion of the copolymer.