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Authors
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Huang, X. ; Appelhans, D. ; Formanek, P. ; Simon, F. ; Voit, B.
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Title
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Synthesis of well-defined photo-cross-linked polymeric nanocapsules by surface-initiated RAFT polymerization
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Date
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02.11.2011
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Number
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30182
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Abstract
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Narrowly distributed hollow polymeric nanocapsules (PtBMA-co-PDMIPM-b-PHPMA), with the size of 450 or 900 nm, were first synthesized by surface-initiated reversible addition–fragmentation chain transfer (RAFT) polymerization exploiting silica nanoparticles as sacrificial templates and 2,3-dimethylmaleic imidopropyl methacrylate (DMIPM) as a photo-cross-linker. First, silica nanoparticles were amino functionalized by aminosilane agents, and then the dithiocarbonate chain transfer agent (CTA) was anchored via activated R-groups to the amino-functionalized surface of silica nanoparticles. This surface layer of CTA groups was then used to grow linear copolymers and block copolymers by RAFT polymerization leading to a core–shell morphology. TEM and GPC results indicated that the thickness of the shell can be well governed by simply controlling the molecular weight of the grafted copolymer. Finally, after photo-cross-linking and etching the silica core with NH4F/HF buffer, hollow nanocapsules were obtained, of which the morphology and composition were confirmed by employing a range of techniques, such as TEM, cryo-TEM, DLS, SEM, XPS, TGA, FTIR, GPC, and UV–vis spectroscopy. Thus, robust and narrowly distributed polymeric nanocapsules with size of 450 nm and a wall thickness 10 nm based on the grafted block copolymer PtBMA-co-PDMIPM-b-PHPMA having Mn = 19·500 g/mol (GPC) could be prepared.
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Publisher
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Macromolecules
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Wikidata
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Q57777459
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Citation
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Macromolecules 44 (2011) 8351-8360
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DOI
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https://doi.org/10.1021/MA201982F
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Tags
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transfer radical polymerization chain transfer polymerization mixed homopolymer brushes silica nanoparticles click chemistry nanostructured materials hollow nanoparticles carbon nanotubes block-copolymers drug carriers
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