The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Locating sulfonic acid groups on various side chains to poly(arylene ether sulfone)s: effects on the ionic clustering and properties of proton-exchange membranes

På svenska

Author

Summary, in English

Poly(arylene ether sulfone)s carrying various aromatic mono-, di-, and trisulfonated side´chains have been investigated with respect to their nanoscale structure and key membrane properties. Sulfobenzoyl, sulfonaphthoxybenzoyl, disulfonaphthoxybenzoyl, and trisulfopyrenoxybenzoyl side chains were attached to the poly(arylene ether sulfone) main chain by employing different combinations of metallation and nucleophilic aromatic substitution reactions. The nature of the sulfonated side chains was found to either promote or suppress the formation of ionic clusters, in relation to the ionic clustering occurring in corresponding polymers carrying sulfonic acid groups directly on the main chain. Analysis by small angle X-ray scattering (SAXS) of solvent cast membranes showed that the ionic clustering was promoted by placing the sulfonic acid groups on relatively long sulfonated naphthoxybenzoyl or pyrenoxybenzoyl side chains. This resulted in SAXS profiles that indicated larger characteristic separation lengths and narrower ionomer peaks, as compared with corresponding main-chain sulfonated polymers. On the other hand, the ionic clustering was almost completely suppressed in membranes based on polymers functionalized with short 2-sulfobenzoyl side chains. Proton conductivity measurements at low or moderate water contents showed a trend of increasing conductivities with the length and the sulfonic acid functionality of the side chain. The

structure of the side chain also influenced the thermal stability and glass transition temperature of the membranes.

Publishing year

2010

Language

English

Pages

87-95

Publication/Series

Journal of Membrane Science

Volume

351

Issue

1-2

Document type

Journal article

Publisher

Elsevier

Topic

  • Chemical Sciences

Keywords

  • ionomers
  • polyelectrolytes
  • proton exchange membrane fuel cells
  • x-ray scattering
  • polymer electrolytes

Status

Published

ISBN/ISSN/Other

  • ISSN: 0376-7388