Abstract
Poly(α-methylstyrene-b-isobutylene-b-α-methylstyrene) (PaMeSt-PIB-PaMePSt) triblock copolymers have been prepared via coupling of living diblock copolymers in a one pot procedure. The PaMeSt-PIB diblock copolymers were synthesized by living sequential cationic polymerization in methylcyclohexane (MeChx)/methylchloride (MeCl) solvent mixtures at -80 °C using BCl 3 for aMeSt polymerization and TiCl 4 for IB polymerization as coinitiators. The crossover efficiency, however, was only ∼57 %, due to intermolecular alkylation (indanyl ring formation) after the addition of TiCl 4 . By modifying the PaMeSt end with a short segment of p-chloro-a-methylstyrene before IB addition the crossover efficiency was increased to 90 %. Coupling of the living block copolymers with 2,2-bis[4-(1-phenylethenyl)phenyl]propane (BDPEP) was rapid and gave - 90 % efficiency.
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