New polymethylene-based AB(2) star copolymers synthesized via a combination of polyhomologation of ylides and atom transfer radical polymerization

摘要

New polymethylene-based AB(2) star polymers with well-defined architecture and various components were synthesized using a combination of polyhomologation of ylides and atomic transfer radical polymerization (ATRP). The chain structures of polymethylene-b-(polystyrene)(2) (PM-b-(PS)(2)) and polymethylene-b-( poly(methyl methacrylate))(2) (PM-b-(PMMA)(2)) were characterized through H-1 NMR, GPC and FT-IR. The porous films of such star copolymers were fabricated via a static breath-figure (BF) process. The influence of polymer molecular weight, solution concentration and environmental temperature on the morphology of such block copolymer films was investigated. The porous surface of such a film presents hydrophobic behaviour with a static water-droplet contact angle of ca. 108 degrees. The electrospinning of PM-b-(PS)(2) was performed using CHCl3 as a solvent and the wrinkle-like polymer particles with nanopores on their surface were obtained.