Synthesis and characterization of polystyrene chains on the surface of silica nanoparticles: comparison of SANS, SAXS, and DLS results

Kim, Chang J.; Sondergeld, Katrin; Mazurowski, Markus; Gallei, Markus; Rehahn, Matthias; Spehr, Tinka Luise; Frielinghaus, Henrich; Stühn, Bernd

doi:10.1007/s00396-013-2923-z

Cited by 24 publications

(31 citation statements)

References 46 publications

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“…The chain ends of the living polymer brushes with lithium counterion were successfully functionalized with hydroxyl group by adding ethylene oxide and further used for the polymerization of ethylene oxide in the presence of potassium counterion. In a very recent study, Kim and coworkers applied a similar strategy to functionalize silica nanoparticles using (3-chloropropyl)triethoxysilane [32]. They used metal-halogen exchange reaction to graft PS via anionic polymerization in toluene.…”

Section: Anionic Polymerization From Silicon Oxide Particles and Subsmentioning

confidence: 97%

Surface-Initiated Anionic Polymerization from Nanomaterials

Baskaran

2015

Anionic Polymerization

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Surface-initiated anionic polymerization is one of the many techniques used for the modification of organic and inorganic nanomaterials. Surface modification of nanomaterials using polymers is a unique way to reduce interface incompatibility of nanomaterials for applications in new technologies. The properties of nanomaterials strongly depend on their compatibility with organic phases either in bulk or in solution. This chapter focuses on surface grafting of polymers using living anionic polymerization from various nanomaterials and provides accounts on the developments in this area.

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Section: Anionic Polymerization From Silicon Oxide Particles and Subsmentioning

confidence: 97%

Surface-Initiated Anionic Polymerization from Nanomaterials

Baskaran

2015

Anionic Polymerization

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“…For PS grafted dPS particles we consider a linear variation of scattering length density from the dPS core to the solvent as the simplest model accounting for the radial variation of polymer density in the shell (8). This density profile is a more phenomenological approach compared to models stated in other reports (7,12).…”

Section: Small Angle Neutron Scatteringmentioning

confidence: 98%

“…Incoherent background was subtracted from the data. For details we refer to our previous report (8).…”

Section: Instrumentationmentioning

confidence: 99%

“…Thus, single particle scattering is expected and interparticle interferences were neglected. For some samples aggregation of particles occurred which we describe by an additional intensity term Cq −α (8). The intensity is provided by:…”

Section: Small Angle Neutron Scatteringmentioning

confidence: 99%

“…The stretching state in turn is mainly controlled by two system parameters, the grafting density of polymer chains on the nanoparticle surface and the molecular weight of the polymer chains. Experimentally, the grafting density is determined by either thermo-gravimetric analysis (7) (TGA) or by small angle neutron scattering (SANS) experiments (8). Here, we report on scattering experiments to get insight into the influence of the character of the nanoparticle (inorganic or organic) on the interaction with the grafted polymer chains.…”

Section: Introductionmentioning

confidence: 99%

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Polymer Chain Conformation on Deuterated Polystyrene Nanoparticles Investigated by SANS

et al. 2014

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We previously reported that grafted polystyrene (PS) chains on silica nanoparticles at a low grafting density show similar conformations to free PS chains in the same solvent, THF (diameter ∼50 nm, Colloid.poly.Sci. (2013), 291, 9, 2087-2099. As an extension of our previous study we choose an organic nanoparticle (deuterated polystyrene, dPS) instead of inorganic nanoparticle to see the impact of the substrate material on chain conformation. Additionally, a wider range of molecular weights were prepared to investigate the conformation feature of grafted PS chains more in detail. Small angle neutron scattering (SANS) experiments were performed to characterize PS grafted dPS particles in good solvent condition, with deuterated toluene and deuterated THF as solvent. To get insight into the conformation of the grafted PS layer we apply a scaling law describing the dimension of free PS polymer in good solvent condition to the obtained thickness of the grafted PS layer. We find an overall agreement with the scaling law where the thickness of the grafted PS layer is slightly larger than 2R g of the free polymer chains in the respective solvent giving hint for semi dilute polymer brush (SDPB) situation.

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