Accessibility navigation


Controlled variation of monomer sequence-distribution in the synthesis of aromatic poly(ether ketone)s

Lim, K. J. C., Cross, P., Mills, P. and Colquhoun, H. M. (2016) Controlled variation of monomer sequence-distribution in the synthesis of aromatic poly(ether ketone)s. High Performance Polymers, 28 (8). pp. 984-992. ISSN 1361-6412

[img]
Preview
Text (Open Acess) - Published Version
· Available under License Creative Commons Attribution.
· Please see our End User Agreement before downloading.

552kB
[img]
Preview
Text - Accepted Version
· Please see our End User Agreement before downloading.

566kB

It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing.

To link to this item DOI: 10.1177/0954008315612140

Abstract/Summary

The effects of varying the alkali metal cation in the high-temperature nucleophilic synthesis of a semi-crystalline, aromatic poly(ether ketone) have been systematically investigated, and striking variations in the sequence-distributions and thermal characteristics of the resulting polymers were found. Polycondensation of 4,4'-dihydroxybenzophenone with 1,3-bis(4-fluorobenzoyl)benzene in diphenylsulfone as solvent, in the presence of an alkali metal carbonate M2CO3 (M= Li, Na, K, or Rb) as base, affords a range of different polymers that vary in the distribution pattern of 2-ring and 3-ring monomer units along the chain. Lithium carbonate gives an essentially alternating and highly crystalline polymer, but the degree of sequence-randomisation increases progressively as the alkali metal series is descended, with rubidium carbonate giving a fully random and non-thermally-crystallisable polymer. Randomisation during polycondensation is shown to result from reversible cleavage of the ether linkages in the polymer by fluoride ions, and an isolated sample of alternating-sequence polymer is thus converted to a fully randomised material on heating with rubidium fluoride.

Item Type:Article
Refereed:Yes
Divisions:Interdisciplinary centres and themes > Chemical Analysis Facility (CAF)
Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) > NMR (CAF)
Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) > Thermal (CAF)
Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) > Xray (CAF)
ID Code:43742
Publisher:Sage

Downloads

Downloads per month over past year

University Staff: Request a correction | Centaur Editors: Update this record

Page navigation