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Ultrasound‒Mediated Synthesis of High‒Molecular Weight Polystyrene‒Grafted Silver Nanoparticles by Facile Ligand Exchange Reactions in Suspension

Authors

  • Holger Pletsch,

    1. Universität Bayreuth, Macromolecular Chemistry II and Bayreuth, Center for Colloids and Interfaces, Universitätsstraße 30, 95440, Bayreuth, Germany
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  • Ling Peng,

    1. Universität Bayreuth, Macromolecular Chemistry II and Bayreuth, Center for Colloids and Interfaces, Universitätsstraße 30, 95440, Bayreuth, Germany
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  • Fabian Mitschang,

    1. Universität Bayreuth, Macromolecular Chemistry II and Bayreuth, Center for Colloids and Interfaces, Universitätsstraße 30, 95440, Bayreuth, Germany
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  • Andreas Schaper,

    1. Zentrum für Materialwissenschaften, Philipps‒Universität Marburg, Hans‒Meerwein‒Straße, 35032, Marburg, Germany
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  • Michael Hellwig,

    1. Zentrum für Materialwissenschaften, Philipps‒Universität Marburg, Hans‒Meerwein‒Straße, 35032, Marburg, Germany
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  • David Nette,

    1. Fachbereich Chemie, Philipps‒Universität Marburg, Hans‒Meerwein‒Straße, 35032, Marburg, Germany
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  • Andreas Seubert,

    1. Fachbereich Chemie, Philipps‒Universität Marburg, Hans‒Meerwein‒Straße, 35032, Marburg, Germany
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  • Andreas Greiner,

    Corresponding author
    1. Universität Bayreuth, Macromolecular Chemistry II and Bayreuth, Center for Colloids and Interfaces, Universitätsstraße 30, 95440, Bayreuth, Germany
    • Universität Bayreuth, Macromolecular Chemistry II and Bayreuth, Center for Colloids and Interfaces, Universitätsstraße 30, 95440, Bayreuth, Germany.

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  • Seema Agarwal

    Corresponding author
    1. Universität Bayreuth, Macromolecular Chemistry II and Bayreuth, Center for Colloids and Interfaces, Universitätsstraße 30, 95440, Bayreuth, Germany
    • Universität Bayreuth, Macromolecular Chemistry II and Bayreuth, Center for Colloids and Interfaces, Universitätsstraße 30, 95440, Bayreuth, Germany.

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Abstract

Ultrasound mediated facile ligand exchange method in suspension for the formation of polystyrene‒grafted silver nanoparticles is reported. Amazingly, this method allows even grafting of very high molecular weight polystyrenes (up to 217 200 g mol−1) having a single terminal thiol group at the chain end. Detailed studies are carried out to gain insights in the role of molecular weight of the ligands and the mechanism of the ligand exchange reactions. Key factors are determined to be the droplet formation by ultrasonification and low silver content, which enhances the availability of the terminal thiol end group significantly. The extraordinary compatibility of the ligand exchange method in particular regarding high molecular weights is attributed to hydrophilic orientation of the terminal thiol groups at the liquid‒liquid interphase. This is proved conclusively by using an in situ method as a reference approach in which agglomeration occurs at considerably lower molecular weights due to the absence of preferred end group orientation within the polymer coil. In homogeneous phase only the chain length is found to be the crucial factor in stabilization of silver nanoparticles.

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