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SUMMARY:Polymer brushes: conformation and adhesion - Dr Mark Geoghegan\, U
 niversity of Sheffield
DTSTART:20051107T160000Z
DTEND:20051107T170000Z
UID:TALK4539@talks.cam.ac.uk
CONTACT:Chris McNeill
DESCRIPTION:Polymers attached to surfaces (brushes) present a useful means
  of compatibilisation between organic and inorganic surfaces. However the 
 conformation of polymer brushes represent an interesting problem in polyme
 r physics and is not wholly understood. Older work on the structure of pol
 ystyrene grafted onto a silicon surface interdigitating into a polystyrene
  network matrix will be used to introduce the subject\, before moving onto
  the more complex problem of polyelectrolyte brushes in an aqueous environ
 ment. The polyelectrolyte brushes are synthesised by atom transfer radical
  polymerization\, which enables the creation of rather dense brush layers.
  Despite being dense\, it is observed that polybase brushes of poly[(dieth
 yl amino)ethyl methacrylate] form an unexpected 'mushroom' conformation in
  acid solution. The interaction of polyelectrolyte brushes with polyelectr
 olyte networks is an interesting combination as it creates the possibility
  of reversible adhesion\, and early results to this end will be presented.
LOCATION:IRC Superconductivity Seminar Room\, Cavendish Laboratory\, Depar
 tment of Physics
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