Preparation of nanocomposites by reversible addition-fragmentation chain transfer polymerization from the surface of quantum dots in miniemulsion

A.C. Carvalho Esteves, de, P. Hodge, T. Trindade, A.M.M.V. Barros-Timmons

    Research output: Contribution to journalArticleAcademicpeer-review

    19 Citations (Scopus)

    Abstract

    Herein, we report the synthesis of quantum dots (QDs)/polymer nanocomposites by reversible addition-fragmentation chain transfer (RAFT) polymerization in miniemulsions using a grafting from approach. First, the surfaces of CdS and CdSe QDs were functionalized using a chain transfer agent, a trisalkylphosphine oxide incorporating 4-cyano-4-(thiobenzoylsulfanyl)pentanoic acid moieties. Using a free radical initiator (AIBN) to activate the RAFT process, a polystyrene (PS) block was grafted from the surface of the QDs. Quantum confinement effects were identified for the nanocomposite obtained, so attesting to the integrity of the QDs after the polymerization. Free PS chains were also present in the final nanocomposite, indicating that the RAFT polymerization from the surface of the QDs was accompanied by conventional free radical polymerization. After isolating the nanocomposite particles, a second poly(n-butyl acrylate) block was tentatively grown from the initial PS block. The first results indicated a successful polymerization of the second polymer and show the potential of the current strategy to prepare block copolymers from the surface of the RAFT-modified QDs.
    LanguageEnglish
    Pages5367-5377
    JournalJournal of Polymer Science, Part A: Polymer Chemistry
    Volume47
    Issue number20
    DOIs
    StatePublished - 2009

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    Semiconductor quantum dots
    Nanocomposites
    Polymerization
    Polystyrenes
    Polymers
    Pentanoic Acids
    Quantum confinement
    Free radical polymerization
    Free radicals
    Oxides
    Block copolymers
    Free Radicals
    Acids

    Cite this

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    title = "Preparation of nanocomposites by reversible addition-fragmentation chain transfer polymerization from the surface of quantum dots in miniemulsion",
    abstract = "Herein, we report the synthesis of quantum dots (QDs)/polymer nanocomposites by reversible addition-fragmentation chain transfer (RAFT) polymerization in miniemulsions using a grafting from approach. First, the surfaces of CdS and CdSe QDs were functionalized using a chain transfer agent, a trisalkylphosphine oxide incorporating 4-cyano-4-(thiobenzoylsulfanyl)pentanoic acid moieties. Using a free radical initiator (AIBN) to activate the RAFT process, a polystyrene (PS) block was grafted from the surface of the QDs. Quantum confinement effects were identified for the nanocomposite obtained, so attesting to the integrity of the QDs after the polymerization. Free PS chains were also present in the final nanocomposite, indicating that the RAFT polymerization from the surface of the QDs was accompanied by conventional free radical polymerization. After isolating the nanocomposite particles, a second poly(n-butyl acrylate) block was tentatively grown from the initial PS block. The first results indicated a successful polymerization of the second polymer and show the potential of the current strategy to prepare block copolymers from the surface of the RAFT-modified QDs.",
    author = "{Carvalho Esteves, de}, A.C. and P. Hodge and T. Trindade and A.M.M.V. Barros-Timmons",
    year = "2009",
    doi = "10.1002/pola.23586",
    language = "English",
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    journal = "Journal of Polymer Science, Part A: Polymer Chemistry",
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    Preparation of nanocomposites by reversible addition-fragmentation chain transfer polymerization from the surface of quantum dots in miniemulsion. / Carvalho Esteves, de, A.C.; Hodge, P.; Trindade, T.; Barros-Timmons, A.M.M.V.

    In: Journal of Polymer Science, Part A: Polymer Chemistry, Vol. 47, No. 20, 2009, p. 5367-5377.

    Research output: Contribution to journalArticleAcademicpeer-review

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    T1 - Preparation of nanocomposites by reversible addition-fragmentation chain transfer polymerization from the surface of quantum dots in miniemulsion

    AU - Carvalho Esteves, de,A.C.

    AU - Hodge,P.

    AU - Trindade,T.

    AU - Barros-Timmons,A.M.M.V.

    PY - 2009

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    AB - Herein, we report the synthesis of quantum dots (QDs)/polymer nanocomposites by reversible addition-fragmentation chain transfer (RAFT) polymerization in miniemulsions using a grafting from approach. First, the surfaces of CdS and CdSe QDs were functionalized using a chain transfer agent, a trisalkylphosphine oxide incorporating 4-cyano-4-(thiobenzoylsulfanyl)pentanoic acid moieties. Using a free radical initiator (AIBN) to activate the RAFT process, a polystyrene (PS) block was grafted from the surface of the QDs. Quantum confinement effects were identified for the nanocomposite obtained, so attesting to the integrity of the QDs after the polymerization. Free PS chains were also present in the final nanocomposite, indicating that the RAFT polymerization from the surface of the QDs was accompanied by conventional free radical polymerization. After isolating the nanocomposite particles, a second poly(n-butyl acrylate) block was tentatively grown from the initial PS block. The first results indicated a successful polymerization of the second polymer and show the potential of the current strategy to prepare block copolymers from the surface of the RAFT-modified QDs.

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