The effect of tacticity on the conformational properties of poly(1-olefin sulfone)s

John F. Callan, Allan H. Fawcett, Robert K. Malcolm

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    The effect of tacticity on the conformational properties of poly(olefin sulfone)s was studied. Tactic polymers, prepared from racemic thiirane monomers using chiral inititators were compared with atactic polymers prepared by free radical co-polymerisation of the 1-olefin with sulfur dioxide. Analysis of the XRD patterns showed that the tactic polymers formed more ordered structures in the bulk with longer layer spacings, consistent with a model in which their side chains meet at the tips in contrast with the atactic polymers whose side chains interdigitate. C-13 MAS NMR experiments suggest that as tacticity increases so too does the proportion of C-S bonds in the gauche conformation, however the proportion of S-C bonds in the trans conformation falls, in contrast to a reported molecular mechanics study. Finally, DSC measurements on the polymers with longer side chains showed the presence of two endotherms on heating, illustrating definite liquid crystalline behaviour.
    LanguageEnglish
    Pages107-113
    JournalJournal of Polymer Research
    Volume15
    Issue number2
    DOIs
    Publication statusPublished - Apr 2008

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    Sulfones
    Alkenes
    Polymers
    Conformations
    Sulfur Dioxide
    Molecular mechanics
    Chemical bonds
    Copolymerization
    Free Radicals
    Monomers
    Nuclear magnetic resonance
    Crystalline materials
    Heating
    Liquids
    Experiments

    Cite this

    Callan, John F. ; Fawcett, Allan H. ; Malcolm, Robert K. / The effect of tacticity on the conformational properties of poly(1-olefin sulfone)s. In: Journal of Polymer Research. 2008 ; Vol. 15, No. 2. pp. 107-113.
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    The effect of tacticity on the conformational properties of poly(1-olefin sulfone)s. / Callan, John F.; Fawcett, Allan H.; Malcolm, Robert K.

    In: Journal of Polymer Research, Vol. 15, No. 2, 04.2008, p. 107-113.

    Research output: Contribution to journalArticle

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    AB - The effect of tacticity on the conformational properties of poly(olefin sulfone)s was studied. Tactic polymers, prepared from racemic thiirane monomers using chiral inititators were compared with atactic polymers prepared by free radical co-polymerisation of the 1-olefin with sulfur dioxide. Analysis of the XRD patterns showed that the tactic polymers formed more ordered structures in the bulk with longer layer spacings, consistent with a model in which their side chains meet at the tips in contrast with the atactic polymers whose side chains interdigitate. C-13 MAS NMR experiments suggest that as tacticity increases so too does the proportion of C-S bonds in the gauche conformation, however the proportion of S-C bonds in the trans conformation falls, in contrast to a reported molecular mechanics study. Finally, DSC measurements on the polymers with longer side chains showed the presence of two endotherms on heating, illustrating definite liquid crystalline behaviour.

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