Journal of Polymer Research

, Volume 15, Issue 2, pp 107–113

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

  • John F. Callan
  • Allan H. Fawcett
  • Robert K. Malcolm
Article

DOI: 10.1007/s10965-007-9149-z

Cite this article as:
Callan, J.F., Fawcett, A.H. & Malcolm, R.K. J Polym Res (2008) 15: 107. doi:10.1007/s10965-007-9149-z
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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. 13C 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.

Keywords

Poly(olefin sulfone)sCPMAS NMRXRDDSCPolarizing microscopy

Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • John F. Callan
    • 1
    • 3
  • Allan H. Fawcett
    • 1
  • Robert K. Malcolm
    • 2
  1. 1.School of ChemistryQueen’s University of BelfastBelfastUK
  2. 2.School of PharmacyQueen’s University of BelfastBelfastUK
  3. 3.School of PharmacyThe Robert Gordon UniversityAberdeenUK