Inhaltszusammenfassung

We describe here a straightforward strategy towards the high yield preparation of raspberry-like allorganic particles. Poly(acrylic acid)-b-poly(butyl acrylate) core-shell nanoparticles (D similar to 80 nm) and larger poly(ethylene oxide)-b-poly(butyl acrylate) core-shell (D similar to 230 nm), synthesized by RAFT emulsion polymerization, were mixed at high solids content (23 wt%) at room temperature without any particular precaution (no dropwise addition, no pH adjustment). Raspberry-like pa...We describe here a straightforward strategy towards the high yield preparation of raspberry-like allorganic particles. Poly(acrylic acid)-b-poly(butyl acrylate) core-shell nanoparticles (D similar to 80 nm) and larger poly(ethylene oxide)-b-poly(butyl acrylate) core-shell (D similar to 230 nm), synthesized by RAFT emulsion polymerization, were mixed at high solids content (23 wt%) at room temperature without any particular precaution (no dropwise addition, no pH adjustment). Raspberry-like particles constituted of one central PEO-b-PBA particle surrounded by about thirty PAA-b-PBA particles were successfully obtained, with no coagulum formation. The heteroaggregation process is probably driven by the hydrogenbond interactions between the PAA and the PEO shells of the particles. The raspberry-like particles were characterized using electron microscopy (TEM and cryo-TEM), dynamic light scattering (DLS), chromatography (HDC) and calorimetry (ITC), demonstrating the selectivity of the process. (C) 2014 Elsevier Ltd. All rights reserved. » weiterlesen» einklappen

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