Synthesis of ABC type miktoarm star copolymers by triple click chemistry


ISKIN B., YILMAZ G., Yagci Y.

POLYMER CHEMISTRY, vol.2, no.12, pp.2865-2871, 2011 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 2 Issue: 12
  • Publication Date: 2011
  • Doi Number: 10.1039/c1py00352f
  • Title of Journal : POLYMER CHEMISTRY
  • Page Numbers: pp.2865-2871

Abstract

An ABC type miktoarm star copolymer possessing polystyrene (PS), poly(epsilon-caprolactone) (PCL) and poly(ethylene glycol) (PEG) arms was synthesized by combining existing triple click chemistries, namely thiol-ene, copper catalyzed azide-alkyne cycloaddition (CuAAC) and Diels-Alder (DA) reactions. For this purpose, a core (1-(allyloxy)-3-azidopropan-2-yl (anthracen-9-ylmethyl) succinate) with allyl, azide and anthracene functionalities was synthesized in two steps with high yields. Then, polymers with corresponding clickable sites, namely omega-thiol polystyrene (PS-SH), alpha-alkyne poly(epsilon-caprolactone) (alkyne-PCL) and omega-maleimide poly(ethylene glycol) (Me-PEG-MI), were independently prepared. As the first step of the grafting onto process, PS-SH was thiol-ene clicked onto the core to yield PS-N-3-Ant. Finally, alkyne-PCL and Me-PEG-MI were bonded to PS-N-3-Ant either in a sequential or a one-pot in situ manner using CuAAC and DA click reactions. All intermediates, related polymers at different stages and final PS-PCL-PEG miktoarm star copolymer were characterized by H-1 NMR, FT-IR, and GPC analyses.