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

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Callan, John F., Fawcett, Allan H. and Malcolm, Robert K. (2008) The effect of tacticity on the conformational properties of poly(1-olefin sulfone)s. JOURNAL OF POLYMER RESEARCH, 15 (2). pp. 107-113. [Journal article]

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DOI: 10.1007/s10965-007-9149-z

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.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences
Faculty of Life and Health Sciences > School of Pharmacy and Pharmaceutical Science
Research Institutes and Groups:Biomedical Sciences Research Institute
Biomedical Sciences Research Institute > Pharmaceutical Science and Practice
ID Code:4067
Deposited By:Professor John Callan
Deposited On:05 Jan 2010 11:48
Last Modified:19 Nov 2012 15:24

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