Recent decades, multi-arms polymers have received great
attention due to their impressive viscoelastic behavior, mechanical
properties, and compatibilities with other polymeric materials. Yshaped
hydrophilic block copolymers were synthesized via
functional atom transfer radical polymerization (ATRP) macroinitiators
[1,2]. Milktoarm and homoarm star copolymers were
synthesized by arm-first method as a simple and general method
following living free radical principle [3]. The functionalized
asymmetric star polymers containing conductive polyacetylene
segments were built by living anionic polymerization [4]. Takaho
et al. [5] reported that quantitative synthesis of star-shaped
poly(vinyl ether)s with a narrow molecular weight distribution
were synthesized by living cationic polymerization. By ‘‘core-first’’
strategy, three-arm star polyethylene was formed via ethylene
living polymerization promoted with a trinuclear Pd diimine
catalyst following the coordination polymerization mechanism [6].