Synthesis of A(3)B(3)-type polystyrene-poly(methyl methacrylate) miktoarm star polymers via combination of stable free radical and atom transfer radical polymerization routes


Durmaz H., Aras S., Hizal G., Tunca U.

DESIGNED MONOMERS AND POLYMERS, vol.8, no.3, pp.203-210, 2005 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 8 Issue: 3
  • Publication Date: 2005
  • Doi Number: 10.1163/1568555053993970
  • Title of Journal : DESIGNED MONOMERS AND POLYMERS
  • Page Numbers: pp.203-210

Abstract

An A(3)B(3)-type miktoarm star polymer was prepared utilizing a "core-out" method via combination of stable free radical polymerization (SFRP) and atom transfer radical polymerization (ATRP). First, SFRP of styrene was carried out by using a miktofunctional initiator, benzene- 1,3,5-tricarboxylic acid tris{3-(2-bromo-2-methyl-propionyloxy)-2-methyl-2-[2-phenyl2-(2,2,6,6-tetramethylpiperidin- 1-yloxy)ethoxy-carbonyl]propyl) ester, at 125 degrees C. Second, previously obtained polystyrene (A(3)-type PSt) precursor with three bromine functionallities in the core was used as a macroinitiator for ATRP of methyl methacrylate (MMA) in the presence of Cu(I)CI and pentamethyldiethylenetriamine at 90 degrees C in order to give an A(3)B(3)-type miktoarm star polymer, (PSt)3(PMMA)3, with controlled molecular weight and moderate polydispersity (M-w/M-n < 1.41), The obtained polymers were characterized by gel-permeation chromatography and H-1-NMR.