Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 46, Issue 14, Pages 4830-4842Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/pola.22816
Keywords
anionic; atom transfer radical polymerization (ATRP); block copolymers; micelles; thermosensitive; vesicles
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Thermosensitive anionic block copolymers of sodium 2-acrylamido-2-methylpropanesulfonate (AMPS) and N-isopropylacrylamide (NIPAAM) with different block lengths were prepared by atom transfer radical polymerization (ATRP). Controlled polymerization was achieved by using ethyl 2-chloropropionate (ECP) as initiator and CuCl/CuCl2/tris(2-dimethylaminoethyl)amine (Me6TREN) catalytic system in DMF:water 50:50 (v/v) mixtures at 20 degrees C. Blocks lengths ranging from 36 to 98 repeating units were obtained. The association properties in aqueous solutions at different NaCl ionic strengths were studied as a function of temperature and polymer concentration by dynamic light scattering, fluorescence spectroscopy, and energy-filtered transmission electron microscopy. The block copolymers with a higher pNIPAAM/pAMPS ratio formed spherical core-shell type micelles independently of the ionic strength. The block copolymers with lower pNIPAAM/pAMPS ratio formed core-shell type micelles at high ionic strength. Larger particles were observed at low ionic strength, which could be due to the formation of vesicles or compound micelles/micellar clusters. (C) 2008 Wiley Periodicals, Inc.
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