Callan, John F. and Fawcett, Allan H. (2008) Isotactic poly(1-hexene sulfone)s by stereoselective anionic ring-opening polymerisation. POLYMER INTERNATIONAL, 57 (2). pp. 240-246. [Journal article]
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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.
|Item Type:||Journal article|
|Faculties and Schools:||Faculty of Life and Health Sciences > School of Pharmacy and Pharmaceutical Science|
Faculty of Life and Health Sciences
|Research Institutes and Groups:||Biomedical Sciences Research Institute|
Biomedical Sciences Research Institute > Pharmaceutical Science and Practice
|Deposited By:||Professor John Callan|
|Deposited On:||05 Jan 2010 14:13|
|Last Modified:||19 Nov 2012 15:23|
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