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High-density polystyrene-grafted silver nanoparticles and their use in the preparation of nanocomposites with antibacterial properties

High-density polystyrene-grafted silver nanoparticles and their use in the preparation of nanocomposites with antibacterial properties

Journal of Colloid and Interface Science 498: 9-21

ISSN/ISBN: 0021-9797

PMID: 28315584

DOI: 10.1016/j.jcis.2017.03.041

The achievement of uniform nanoparticles distribution in polymer matrix is still a major challenge in the design and fabrication of polymer nanocomposites with desired properties. In this paper we propose a novel approach for the preparation of homogeneous polystyrene/silver nanocomposites utilizing Nitroxide Mediated Radical Polymerization (NMRP). In the first step of the developed procedure, the polystyrene grafted silver nanoparticles ([email protected]) with well-defined core-shell structure and exceptionally high grafting density (from 2 chains/nm2 to 5.9 chains/nm2) have been synthesized through late injection of nitroxide-coated silver nanoparticles (N-AgNPs) into a TEMPOL mediated styrene polymerization system. Afterwards, the synthesized [email protected] have been used for the preparation of nanocomposites (PS/[email protected]) by mixing them with narrow-dispersity polystyrenes and thermoforming at 140°C. Due to the high flexibility of polymer chains attached to silver surface through nitroxide linker, free volume effect enables interpenetration of polystyrene molecules that provides excellent mutual miscibility of [email protected] with polymer matrix. The synthesized nanohybrids ([email protected]) and their nanocomposites (PS/[email protected]) exhibit effective antibacterial activity with respect to pathogenic bacteria: Pseudomonas aeruginosa (Gram-negative representative) and Staphylococcus aureus (Gram-positive representative).

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Accession: 059797305

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