Third Day Poster Session, 17 June 2010 - NanoTR-VI
Third Day Poster Session, 17 June 2010 - NanoTR-VI
Third Day Poster Session, 17 June 2010 - NanoTR-VI
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<strong>Poster</strong> <strong>Session</strong>, Thursday, <strong>June</strong> <strong>17</strong><br />
Theme F686 - N1123<br />
Investigation of Reverse Micellar System of Polystyrene-block-polyacrylic acid in Toluene<br />
Burçin Acar*, Leyla Budama, Önder Topel, Numan Hoda<br />
Akdeniz University Department of Chemistry, Antalya-Turkey<br />
Abstract- Reverse micellization of polystyrene-block-polyacrylic acid copolymer in toluene was investigated by dynamic light scattering<br />
and transmission electron microscope. Micelles were found to be spherical and their hydrodynamic diameter was 79.9 nm.<br />
Amphiphilic block copolymers, consist of a hydrophilic<br />
block and a hydrophobic block, are known to form into<br />
micellar structures by self-assembling in nonpolar organic<br />
solvents. Micelles formed from block copolymers have<br />
many applications in scientific and technical fields, such as<br />
drug-delivery system, synthesis of functional<br />
nanoparticles, detergency, oil recovery and catalysis [1-7].<br />
Previous studies have demonstrated that polystyreneblock-polyacrylic<br />
acid (PS-b-PAA) forms reverse micelles<br />
in some organic solvents [8]. The polyacrylic acid<br />
constitutes the core of the micelle and the polystyrene<br />
constitutes the corona of the micelle.<br />
In this study, we have investigated micellization<br />
behaviour of PS 10912 -b-PAA 10269 copolymer in toluene by<br />
dynamic light scattering (DLS) and transmission electron<br />
microscopy (TEM). Polystyrene-block-poly(tertbutylacrylate)<br />
was first synthesized by ATRP and then<br />
converted into PS-b-PAA by hydrolysis. Micelles were<br />
prepared just dissolving copolymer in toluene and heating<br />
to 135°C then cooling to room temperature. DLS was used<br />
to measure the hydrodynamic diameter of micelles (D h ),<br />
and TEM was used to characterize the morphology of the<br />
micelles. According to DLS measurements D h of the<br />
micelles is 79.9 nm (Fig. 1) and to TEM image, micelles<br />
are spherical (Fig. 2).<br />
Figure 2. TEM image of PS 10912 -b-PAA 10269 in toluene<br />
This work was supported by TÜBTAK under the Grant<br />
No. TBAG-108T806.<br />
*Corresponding Author: burcinacar@akdeniz.edu.tr<br />
[1] D. Myers, Surfaces, Interfaces, and Colloids. Principles and<br />
Applications; VCH Publishers: New York (1991)<br />
[2] D. Langevin, In Reverse Micelles Biological and<br />
Technological Relevance of Amphiphilic Structures in Apolar<br />
Media; Luisi, P. L.; Straub, B. E., Eds.; Plenum Press: New<br />
York, p 287 (1982)<br />
[3] (a) K. Petrak, Brit. Polym. J. 22, 213 (1990) (b) K. Kataoka,<br />
G. S. Kwon, M. Yokoyama, T. Okano, Y. Sakurai, J. Controlled<br />
Release, 24, 119 (1993)<br />
[4] (a) Fendler, J. H.; Fendler, E. J. Catalysis in Micellar and<br />
Macromolecular Systems; Academic Press: New York, (1975)<br />
[5] G. Riess, Colloids Surf A 153:99 (1999)<br />
[6] G. S. Kwon, K. Kataoka Adv Drug Deliv Rev 16:295 (1995)<br />
[7] M. Moffitt, A. Eisenberg, Macromolecules 30:4363 (1997)<br />
[8] Karine Khougaz,† Xing Fu Zhong,‡ and Adi Eisenberg<br />
Aggregation and Critical Micelle Concentrations of Polystyreneb-poly(sodium<br />
acrylate) and Polystyrene-b-poly(acrylic acid)<br />
Micelles in Organic Media Macromolecules 29, 3937-3949 (19)<br />
Figure 1. DLS of PS 10912 -b-PAA 10269 micelles in toluene<br />
6th Nanoscience and Nanotechnology Conference, zmir, <strong>2010</strong> 676
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