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Anomalous Small-Angle X-ray Scattering Study of Structure of Polymer Micelles Having Bromines in Hydrophobic Core

Reference Type:Journal Article
Author:Akiba, Isamu;Takechi, Atsuro;Sakou, Megumi;Handa, Masashi;Shinohara, Yuya;Amemiya, Yoshiyuki;Yagi, Naoto;Sakurai, Kazuo
Author Addresses:Department of Chemistry and Biochemistry, The University of Kitakyushu, 1-1 Hibikino, Kitakyushu 808-0135, Japan.Department of Advanced Materials Science School of Frontier Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), 1-1-1 Kouto, Sayo 679-5198, Japan.
Title:Anomalous Small-Angle X-ray Scattering Study of Structure of Polymer Micelles Having Bromines in Hydrophobic Core
Secondary Title:Macromolecules
Periodical Title:Macromolecules
Pages:6150-6157
Volume:45
Number:15
Year:2012
Publishing Date: 14.8.2012
ISBN:0024-9297
Related URLs:http://dx.doi.org/10.1021/ma300461d

Anomalous small-angle X-ray scattering (ASAXS) near the absorption edge of bromine has been used to investigate the internal structure of polymer micelles comprising poly(4-bromostyrene)-block-poly(ethylene glycol)-block-poly(4-bromostyrene) (PBrS-b-PEG-b-PBrS) in aqueous solution. The ASAXS analysis revealed that the hydrophobic core composed of PBrS can be regarded as a homogeneous sphere with a radius of 10.2 nm and a decaying electron density at the surface. The aggregation number of micelle directly estimated on the basis of ASAXS analysis well agreed with that determined by field-flow fractionation coupled with multiangle light scattering, confirming the reliability of ASAXS analysis. The small-angle X-ray scattering (SAXS) profile from whole PBrS-b-PEG-b-PBrS micelle was further analyzed by using the result of ASAXS analysis. The micelles could be well described by a core–corona model in which the monomer concentration of PEG in the shell decreased as R

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