Synthesis of multiarm star block copolymers via simplified electrochemically mediated ATRP

摘要

Star-shaped polymers were received using beta-cyclodextrin (beta-CD) as core, and methyl methacrylate (MMA) arms via a simplified electrochemically mediated ATRP (seATRP). To demonstrate the living nature of the seATRP, star multiblock copolymers were successfully prepared by chain extension of the x-functional PMMA arms with a tert-butyl acrylate (tBA), and respectively, n-butyl acrylate (BA). Novelty of this work is that the beta-CDPMMA-beta-PtBA-beta-PBA multiarm star block copolymers were synthesized for the first time via seATRP procedure, utilizing 4 x 10(-6) mol% of Cu-II complex. The results from H-1 NMR spectral studies support the formation of 21-arm star (co)polymers. Furthermore, the GPC traces of the arms detached from synthesized star-like (co) polymers confirms the absence of star-star coupling reactions during seATRP. It was shown as an advantage over other ATRP methods-low catalyst concentrations and narrow molecular mass distributions, while maintaining well-defined composition.