Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 10, pp. 1594−1599.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © L.V. Vinogradova, Gy. Török, V.T. Lebedev, 2012, published in Zhurnal Prikladnoi Khimii, 2012, Vol. 85, No. 10, pp. 1662−1667.
AND POLYMERIC MATERIALS
Amphiphilic Star-Shaped Polymer with Fullerene (С
Branching Center and Its Micelle-Forming Properties
L. V. Vinogradova
, Gy. Török
, and V. T. Lebedev
Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg, Russia
Research Institute for Solid State Physics and Optics, Budapest, Hungary
Konstantinov Petersburg Institute of Nuclear Physics, National Research Center Kurchatov Institute, Gatchina,
Leningrad oblast, Russia
Received July 5, 2012
Abstract—A star-shaped amphiphilic polymer with arms of polystyrene and sodium salt of polymethacrylic
acid on the common fullerene (C
) branching center was prepared by hydrolysis of polar chains in a heteroarm
star-shaped fullerene (С
)-containing polymer. The micelle-forming properties of the amphiphilic polymer were
examined by small-angle neutron scattering. Structure of solutions of the polymer in D
O is discussed.
Amphiphilic polymers are of much interest due to
their capability to form aggregated nanostructures in
solutions and in the solid phase via nonvalent intermo-
lecular interactions. By varying the chemical structure of
the macromolecules being synthesized, it is possible to
control the molecular assembling and obtain nanosystems
of different structures, promising for pharmaceutical
chemistry, chromatography, emulsion polymerization,
cosmetology, biotechnology, and biochemistry. Owing
to spontaneous intermolecular organization in solutions,
amphiphilic polymers, in particular, biopolymers, form
micelles that are more stable than surfactant micelles and
are formed at lower concentrations.
Star-shaped amphiphilic polymers combining hydro-
phobic and hydrophilic arms at a common branching
center exhibit not only micelle-forming properties [1–5]
but also properties of smart polymers [6–10]; they can act
as nanoreactors for preparing noble metal nanoparticles
[11, 12] used, in particular, in medicine for diagnostics.
Amphiphilic star-shaped polymers can be used for prepar-
ing Langmuir–Blodgett ﬁ lms  and materials promis-
ing for such ﬁ elds as transport of hydrophobic cosmetics
and drugs, tissue engineering scaffolds, fabrication of
anatomic barriers, and cell encapsulation used in tissue
transplantation for preventing the transplanted cells from
In the context of high scientiﬁ c and practical inter-
est in amphiphilic star-shaped polymers, it is topical to
develop new star-shaped structures with preset diphilic
properties by varying the nature not only of arms, but
also of the branching center.
In this study, we prepared a star-shaped polymer with
hydrophobic polystyrene (PS) arms and hydrophilic poly-
electrolytic arms of sodium salt of polymethacrylic acid,
with both kinds of arms bonded to a common hydropho-
bic branching center, fullerene С
molecule. To examine
the micelle-forming properties of the amphiphilic poly-
mer, we used a highly sensitive and informative method,
small-angle neutron scattering, allowing efﬁ cient study of
an object on a nanoscopic level using isotope contrasting
technique, not perturbing the sample structure.
The heteroarm star-shaped precursor polymer con-
taining arms of poly(tert-butyl methacrylate) (PTBMA)
and polystyrene on a common fullerene(С
center was prepared by multistep synthesis using anionic