期刊
COLLOID AND POLYMER SCIENCE
卷 291, 期 9, 页码 2087-2099出版社
SPRINGER
DOI: 10.1007/s00396-013-2923-z
关键词
Small angle scattering; Light scattering; Nanoparticle; Grafting; Polymer conformation
资金
- Deutsche Forschungsgemeinschaft [DFG SPP-1369]
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 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 of free PS chains in THF. Both results are consistent with a coil-like conformation of the grafted PS chains.
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