Well-Defined Comb,Star-Comb,and Comb-on-Comb Polybutadienes by Anionic Polymerization and the Macromonomer Strategy

摘要

Stryrenic macromonomers of polybutadienes(sMMB)were synthesized by selective reaction of living polybutadienes with the silyl chloride group of 4-(chlorodimethylsilyl)styrene.Anionic copolym-erization of sMMBs with butadiene,in the presence of a randomizer(potassium 2,3-dimethyl-3-pentoxide randomizer),led to living random comb polybutadienes(PBCs).Taking advantage of the living character of the PBCs,a number of well-defined comb,star-comb,and comb-on-comb polybutadienes were synthesized by using high-vacuum techniques.All samples prepared were characterized by size exclusion chromatography(SEC)with DRI detector and SEC with two-angle laser light scattering detector(SEC-TALLS).