Surface orientation of hydrophilic groups in sulfonated poly(ether ether ketone) membranes

Download
  1. (PDF, 1 MB)
  2. Get@NRC: Surface orientation of hydrophilic groups in sulfonated poly(ether ether ketone) membranes (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1016/j.jcis.2013.06.063
AuthorSearch for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleJournal of Colloid and Interface Science
ISSN0021-9797
Volume409
Pages193203; # of pages: 11
SubjectSurface molecular reorientation; Wetting; PEM; Sulfonated poly(ether ether ketone); SPEEK
AbstractSulfonated poly(ether ether ketone) copolymers (SPEEK) with a range of sulfonate contents (SC 77–51%) were synthesized via nucleophilic substitution polycondensation from hydroquinone and sulfonated hydroquinone. Membranes obtained by solvent casting from dimethylacetamide onto glass surfaces were analyzed for surface behavior. The surfaces of a membrane were hydrophobic in air, but hydrophilic in water. This surface behavior was corroborated by water contact angle vs. time, using sessile drop measurements. Hydrophilic sulfonic group aggregates on SPEEK chain and various media contacting with the top or bottom surfaces of the membrane during the fabrication process caused differences in surface behavior. Angle-dependent XPS showed that there was a higher atomic S/C ratio of the bottom surface than on the corresponding top surface. The hydrophilic sulfonic groups were in higher concentration within the membrane, with the concentration gradually decreasing towards the surface for SPEEK-HQ-80 and SPEEK-HQ-70 membranes. Acidification with strong acid and higher temperature induced a more hydrophilic surface on a membrane than a milder acidification process. The depth profile at the membrane surface was examined by a combination of contact angle, XPS and ATR-FTIR.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationEnergy, Mining and Environment; National Research Council Canada
Peer reviewedYes
NRC numberNRC-EME-53207
NPARC number21268956
Export citationExport as RIS
Report a correctionReport a correction
Record identifierad32046a-069b-4a1c-9e74-56ec4962d765
Record created2013-11-27
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)