Synthesis and characterization of polystyrene chains on the surface of silica nanoparticles: comparison of SANS, SAXS, and DLS results
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- 作者：Chang J. Kim (1)
Katrin Sondergeld (2)
Markus Mazurowski (2)
Markus Gallei (2)
Matthias Rehahn (2)
Tinka Spehr (1)
Henrich Frielinghaus (3)
Bernd Stühn (1) - 关键词：Small angle scattering ; Light scattering ; Nanoparticle ; Grafting ; Polymer conformation
- 刊名：Colloid & Polymer Science
- 出版年：2013
- 出版时间：September 2013
- 年：2013
- 卷：291
- 期：9
- 页码：2087-2099
- 全文大小：744KB
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Katrin Sondergeld (2)
Markus Mazurowski (2)
Markus Gallei (2)
Matthias Rehahn (2)
Tinka Spehr (1)
Henrich Frielinghaus (3)
Bernd Stühn (1)
1. Institut für Festk?rperphysik, Technische Universit?t Darmstadt, Hochschulstrasse 6, 64289, Darmstadt, Germany
2. Ernst-Berl-Institut für Technische und Makromolekulare Chemie, Technische Universit?t Darmstadt, Petersenstrasse 22, 64287, Darmstadt, Germany
3. Jülich Centre for Neutron Science, Lichtenbergstrasse 1, 85747, Garching, Germany
文摘
An extensive characterization of well-defined polystyrene (PS)-grafted silica nanoparticles is reported. Bare SiO2 particles (diameter 50 nm) were functionalized with a suitable initiator for the surface-initiated anionic polymerization of styrene. Both grafted and free PS chains were characterized and compared by size-exclusion chromatography (SEC). PS-grafted particles were characterized by transmission electron microscopy (TEM), thermogravimetric analysis (TGA), small-angle x-ray scattering (SAXS), small-angle neutron scattering (SANS), and dynamic light scattering (DLS). The thickness of the grafted PS chains was obtained by SANS and DLS and scaled with $M_{\mathrm {w}}^{0.6}$ displaying similar behavior with free PS chains in the same solvent used, tetrahydrofuran (THF). Grafting densities obtained from SANS data and TGA were found to be small, and the thickness of the grafted PS chains determined by SANS was found to be similar to $2R_{\mathrm {g}}$ of free PS chains in THF. Both results are consistent with a “coil-like-conformation of the grafted PS chains.