Anomalous Small-Angle X-ray Scattering Study of Structure of Polymer Micelles Having Bromines in Hydrophobic Core
| Autor: | Masashi Handa, Atsuro Takechi, Megumi Sakou, Kazuo Sakurai, Isamu Akiba, Yoshiyuki Amemiya, Yuya Shinohara, Naoto Yagi |
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| Rok vydání: | 2012 |
| Předmět: |
chemistry.chemical_classification
Materials science Aggregation number Polymers and Plastics Scattering Small-angle X-ray scattering Organic Chemistry Multiangle light scattering Analytical chemistry Polymer Micelle Inorganic Chemistry chemistry.chemical_compound Monomer chemistry Absorption edge Materials Chemistry |
| Zdroj: | Macromolecules. 45:6150-6157 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma300461d |
| Popis: | 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–4.2/3, where R is the distance from the cente... |
| Databáze: | OpenAIRE |
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