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Phase Separation of Polystyrene and Bromo-Polystyrene Mixtures in Equilibrium Structures in Thin Films
 

Summary: Phase Separation of Polystyrene and Bromo-Polystyrene
Mixtures in Equilibrium Structures in Thin Films
D. Slep,, J. Asselta, M. H. Rafailovich,*, J. Sokolov,*, D. A. Winesett,
A. P. Smith, H. Ade, Y. Strzhemechny,| S. A. Schwarz,| and B. B. Sauer
Hilord Chemical Corp., Hauppauge, New York 11788, Department of Material Science,
State University of New York at Stony Brook, Stony Brook, New York 11974, Department of
Physics, North Carolina State University, Raleigh, North Carolina 27695,
Physics Department, Queens College, Flushing, New York 11367, and E. I. Dupont de
Nemours and Company Inc., Experimental Station, Wilmington, DE 19880
Received April 10, 1998. In Final Form: June 17, 1998
ScanningtransmissionX-raymicroscopy(STXM), atomic force microscopy (AFM), and dynamic secondary
ion mass spectrometry (DSIMS) were used to obtain the true three-dimensional concentration profiles of
polystyrene (PS) and bromo-polystyrene (PBrx)0.79S where x ) fraction of monomers brominated) blend
films as a function of PBrx)0.79S concentration. Upon annealing, it is found that the PBrS becomes
encapsulated by the PS. The encapsulation provides for a continuous PS phase for all blend compositions
andexplainstheobservedstructuresthatareformedfordifferentPBrSvolumefractions. Theencapsulation
allows us to estimate the dispersive contribution of the PBrS surface energy to be less than 20.6 dyn/cm.
1. Introduction
PolystyrenePSandpoly(p-bromo)styrene(PBrxS)phase
separation has been studied previously by Strobl et al.1

  

Source: Ade, Harald W.- Department of Physics, North Carolina State University

 

Collections: Physics