2434
Macromolecules 1992,25, 2434-2441
Role of Block Size Asymmetry on the Adsorbed Amount of Polystyrene-b-poly(ethy1eneoxide) on Mica Surfaces from To1uene D.A. Guzonas, D.Boils, C.P.Tripp, and M. L. Hair* Xerox Research Centre of Canada, 2660 Speakman Drive, Mississauga, Ontario, Canada L5K 2L1 Received September 20, 1991;Revised Manuscript Received December 13, 1991 ABSTRACT Surface force and IR data on polystyrene-b-poly(ethy1eneoxide) block copolymers adsorbed on mica from toluene are presented. The copolymers were selected to have a wide range of asymmetry radius / ~ a s by Marques and Joanny. The extended length L of the block copolymers ratio (j3 = R ~ & R ~ p m ) ~ defied for moderately has been measured with the surface force apparatus and shown to scale as L NpgNp~o~I~ asymmetric copolymers (1
