Abstract
| Language | English |
|---|---|
| Pages | 240-246 |
| Journal | Polymer International |
| Volume | 57 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Feb 2008 |
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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 journal › Article
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.
U2 - 10.1002/pi.2330
DO - 10.1002/pi.2330
M3 - Article
VL - 57
SP - 240
EP - 246
JO - Polymer International
T2 - Polymer International
JF - Polymer International
SN - 0959-8103
IS - 2
ER -