8312 Macromolecules, Vol. 43, No. 19, 2010
Park et al.
macroinitiator is described. A dried Schlenk flask was charged
with CuCl (8.02 mg, 0.0810 mmol), CuCl2 (2.18 mg, 0.0162
mmol), 2,20-bipyridine (30.4 mg, 0.194 mmol), MEO2MA (915
mg, 4.86 mmol), and OEGMA (257 mg, 0.540 mmol) under dry
nitrogen atmosphere. After degassed anisole solution of C5-Br
(43 mg, 0.00899 mmol) was added to the flask via gastight
syringe, three cycles of “freeze-pump-thaw” were performed
to remove any oxygen from the polymerization mixture. Then,
the flask was heated at 90 °C. The reaction mixture was carefully
extracted via gastight syringe under dry nitrogen atmosphere at
a certain time interval to investigate the polymerization kinetics.
Conversion of the monomer was determined from the 1H NMR
spectra of the reaction mixture by comparing integration of
protons next to the estereal oxygen at 4.3 ppm corresponding to
both monomers and 4.0 ppm corresponding to the polymer,
respectively. At a proper monomer conversion around 60%, the
polymerization mixture was quenched by cooling in dry ice/
acetone bath and diluted with ethanol. The solution was passed
through a small column of alumina, filtered through a 0.2 μm
syringe filter, and evaporated. The crude product was purified
by dialysis in deionized water for 2 days (Spectra/Por 3 Dialysis
Membrane, cutoff: 3500 g/mol). The purified polymer was
obtained in a form of yellowish oil after azeotropic distillation
of water with ethanol (0.391 g, 52%). Mn 2.88 ꢀ 104 g/mol. PDI:
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Acknowledgment. The authors acknowledge Prof. Sung-Chul
Kim for use of UV/vis equipments and Prof. David G. Churchill
for a spectrofluorophotometer. This work was supported by the
National Research Foundation (NRF) through NRL (R0A-
2008-000-20121-0) program, the Ministry of Environment through
Contract No. 20090192091001-B0-0-001-0-0-2009, and Funda-
mental R&D program for Core Technology of Materials funded
by the Ministry of Knowledge Economy, Republic of Korea.
Supporting Information Available: Figures showing 1H
NMR spectra of the polymers used in the determination of
molecular weights of the polymers, 1H NMR spectra of C5-S83
in protic solvents, and size distributions of the polymer aqueous
solutions on loading of various dyes, and a table giving incor-
poration ratios of OEGMA to MEO2MA. This material is
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