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    Tethered Nanoparticle–Polymer Composites: Phase Stability and Curvature

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    Type
    Article
    Authors
    Srivastava, Samanvaya
    Agarwal, Praveen
    Archer, Lynden A. cc
    KAUST Grant Number
    KUS-C1-018-02
    Date
    2012-04-03
    Online Publication Date
    2012-04-03
    Print Publication Date
    2012-04-17
    Permanent link to this record
    http://hdl.handle.net/10754/599870
    
    Metadata
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    Abstract
    Phase behavior of poly(ethylene glycol) (PEG) tethered silica nanoparticles dispersed in PEG hosts is investigated using small-angle X-ray scattering. Phase separation in dispersions of densely grafted nanoparticles is found to display strikingly different small-angle X-ray scattering signatures in comparison to phase-separated composites comprised of bare or sparsely grafted nanoparticles. A general diagram for the dispersion state and phase stability of polymer tethered nanoparticle-polymer composites incorporating results from this as well as various other contemporary studies is presented. We show that in the range of moderate to high grafting densities the dispersion state of nanoparticles in composites is largely insensitive to the grafting density of the tethered chains and chemistry of the polymer host. Instead, the ratio of the particle diameter to the size of the tethered chain and the ratio of the molecular weights of the host and tethered polymer chains (P/N) are shown to play a dominant role. Additionally, we find that well-functionalized nanoparticles form stable dispersions in their polymer host beyond the P/N limit that demarcates the wetting/dewetting transition in polymer brushes on flat substrates interacting with polymer melts. A general strategy for achieving uniform nanoparticle dispersion in polymers is proposed. © 2012 American Chemical Society.
    Citation
    Srivastava S, Agarwal P, Archer LA (2012) Tethered Nanoparticle–Polymer Composites: Phase Stability and Curvature. Langmuir 28: 6276–6281. Available: http://dx.doi.org/10.1021/la2049234.
    Sponsors
    This publication was based on work supported in part by Award KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST) and by the National Science Foundation, Award DMR-1006323. Facilities available through the Cornell Center for Materials Research (CCMR) were used for this study.
    Publisher
    American Chemical Society (ACS)
    Journal
    Langmuir
    DOI
    10.1021/la2049234
    PubMed ID
    22439646
    ae974a485f413a2113503eed53cd6c53
    10.1021/la2049234
    Scopus Count
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