Isotactic poly(1-hexene sulfone)s by stereoselective anionic ring-opening polymerisation

John F. Callan, Allan H. Fawcett

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    BACKGROUND: Poly(olefin sulfone)s have been shown to form helical regions and to display main-chain liquid-crystalline behaviour in the bulk when they possess long side-chains. It is believed that increasing the tacticity of the backbone could enhance their liquid-crystalline behaviour. This study aims to produce tactic poly(olefin sulfone)s by stereospecific ring-opening polymerisation. RESULTS: Tactic polythiranes were successfully obtained from a racemic mixture of thirane monomers using a series of chiral catalyst systems. The isotactic placement (P-i) was determined using C-13 NMR analysis of carbons in or near the backbone. The polysulfides were oxidised by peracetic acid to their corresponding polysulfones. Powder X-ray diffraction studies showed that the isotactic polysulfones formed more ordered structures than their atactic analogues, an effect attributed to a tightening of the helical pitch. CONCLUSIONS: Tactic poly(1-hexene sulfone)s have been prepared for the first time by stereoselective ringopening polymerisation. (C) 2007 Society of Chemical Industry.
    LanguageEnglish
    Pages240-246
    JournalPolymer International
    Volume57
    Issue number2
    DOIs
    Publication statusPublished - Feb 2008

    Fingerprint

    Sulfones
    Anionic polymerization
    Ring opening polymerization
    Alkenes
    Peracetic Acid
    Crystalline materials
    Liquids
    X ray powder diffraction
    Carbon
    Monomers
    Polymerization
    Nuclear magnetic resonance
    Catalysts
    1-hexene
    polysulfone P 1700

    Cite this

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    title = "Isotactic poly(1-hexene sulfone)s by stereoselective anionic ring-opening polymerisation",
    abstract = "BACKGROUND: Poly(olefin sulfone)s have been shown to form helical regions and to display main-chain liquid-crystalline behaviour in the bulk when they possess long side-chains. It is believed that increasing the tacticity of the backbone could enhance their liquid-crystalline behaviour. This study aims to produce tactic poly(olefin sulfone)s by stereospecific ring-opening polymerisation. RESULTS: Tactic polythiranes were successfully obtained from a racemic mixture of thirane monomers using a series of chiral catalyst systems. The isotactic placement (P-i) was determined using C-13 NMR analysis of carbons in or near the backbone. The polysulfides were oxidised by peracetic acid to their corresponding polysulfones. Powder X-ray diffraction studies showed that the isotactic polysulfones formed more ordered structures than their atactic analogues, an effect attributed to a tightening of the helical pitch. CONCLUSIONS: Tactic poly(1-hexene sulfone)s have been prepared for the first time by stereoselective ringopening polymerisation. (C) 2007 Society of Chemical Industry.",
    author = "Callan, {John F.} and Fawcett, {Allan H.}",
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    doi = "10.1002/pi.2330",
    language = "English",
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    Isotactic poly(1-hexene sulfone)s by stereoselective anionic ring-opening polymerisation. / Callan, John F.; Fawcett, Allan H.

    In: Polymer International, Vol. 57, No. 2, 02.2008, p. 240-246.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Isotactic poly(1-hexene sulfone)s by stereoselective anionic ring-opening polymerisation

    AU - Callan, John F.

    AU - Fawcett, Allan H.

    PY - 2008/2

    Y1 - 2008/2

    N2 - BACKGROUND: Poly(olefin sulfone)s have been shown to form helical regions and to display main-chain liquid-crystalline behaviour in the bulk when they possess long side-chains. It is believed that increasing the tacticity of the backbone could enhance their liquid-crystalline behaviour. This study aims to produce tactic poly(olefin sulfone)s by stereospecific ring-opening polymerisation. RESULTS: Tactic polythiranes were successfully obtained from a racemic mixture of thirane monomers using a series of chiral catalyst systems. The isotactic placement (P-i) was determined using C-13 NMR analysis of carbons in or near the backbone. The polysulfides were oxidised by peracetic acid to their corresponding polysulfones. Powder X-ray diffraction studies showed that the isotactic polysulfones formed more ordered structures than their atactic analogues, an effect attributed to a tightening of the helical pitch. CONCLUSIONS: Tactic poly(1-hexene sulfone)s have been prepared for the first time by stereoselective ringopening polymerisation. (C) 2007 Society of Chemical Industry.

    AB - BACKGROUND: Poly(olefin sulfone)s have been shown to form helical regions and to display main-chain liquid-crystalline behaviour in the bulk when they possess long side-chains. It is believed that increasing the tacticity of the backbone could enhance their liquid-crystalline behaviour. This study aims to produce tactic poly(olefin sulfone)s by stereospecific ring-opening polymerisation. RESULTS: Tactic polythiranes were successfully obtained from a racemic mixture of thirane monomers using a series of chiral catalyst systems. The isotactic placement (P-i) was determined using C-13 NMR analysis of carbons in or near the backbone. The polysulfides were oxidised by peracetic acid to their corresponding polysulfones. Powder X-ray diffraction studies showed that the isotactic polysulfones formed more ordered structures than their atactic analogues, an effect attributed to a tightening of the helical pitch. CONCLUSIONS: Tactic poly(1-hexene sulfone)s have been prepared for the first time by stereoselective ringopening polymerisation. (C) 2007 Society of Chemical Industry.

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    EP - 246

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    JF - Polymer International

    SN - 0959-8103

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