Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 44, Issue 1, Pages 499-509Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/pola.21160
Keywords
anthracene; atom transfer radical polymerization; Diels-Alder reaction; maleimide; miktoarm star polymer; stable free-radical polymerization
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The ABC type miktoarm star terpolymer was prepared utilizing core-in and core-out methods via combination of Diels-Alder reaction (DA), stable free radical polymerization (SFRP), and atom transfer radical polymerization (ATRP). First, in DA reaction, poly(ethylene glycol)-maleimide (PEG-maleimide) precursor was reacted with succinic acid anthracen-9-ylmethyl ester 3-(2-bromo-2-methyl-propionyloxy)-2-methyl-2-[2-phenyl-2-(2,2,6,6-tetramethyl-piperidin-1-yloxy)-ethoxy-carbonyll- propyl ester, 8, to give DA adduct, 9, which has appropriate functional groups for SFRP and ATRP Second, a previously obtained 9 was used as a macroinitiator for SFRP of styrene at 125 degrees C. As a third step, this PEG-polystyrene (PEG-PSt) precursor with a bromine functionality in the core was employed as a macroinitiator for ATRP of tert-butylacrylate (tBA) in the presence of Cu(I)Br and pentamethyldiethylenetriamine at 80 degrees C to give ABC type miktoarm star terpolymer (PEG-PSt-PtBA) with controlled molecular weight and low polydispersity (M(w)/M(n) < 1.27). The obtained polymers were characterized by gel permeation chromatography and (1)H NMR. (c) 2005 Wiley Periodicals, Inc.
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