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Changes in Thermodynamic Interactions at Highly Immiscible Polymer/Polymer Interfaces due to Deuterium Labeling
 

Summary: Changes in Thermodynamic Interactions at Highly Immiscible Polymer/Polymer Interfaces
due to Deuterium Labeling
Shane E. Harton, Frederick A. Stevie, Zhengmao Zhu, and Harald Ade*,
Department of Materials Science & Engineering, Analytical Instrumentation Facility, and Department of
Physics, North Carolina State UniVersity, Raleigh, North Carolina 27695
ReceiVed: March 23, 2006; In Final Form: April 30, 2006
Deuterium labeling has been shown previously to affect thermodynamic interactions at polymer surfaces,
polymer/polymer heterogeneous interfaces, and in bulk (away from a surface or interface). However, the
changes in polymer-polymer interactions due to deuterium labeling have not been thoroughly investigated
for highly immiscible systems. It is shown here that deuterium labeling can influence polymer-polymer
interactions at heterogeneous interfaces with highly immiscible systems, namely, polystyrene/poly(2-
vinylpyridine) (PS/P2VP), polystyrene/poly(4-vinylpyridine) (PS/P4VP), and polystyrene/poly(methyl meth-
acrylate) (PS/PMMA). Using secondary ion mass spectrometry, segregation of deuterium labeled polystyrene
(dPS) in a dPS + unlabeled PS (dPS:hPS) blend layer was observed at the dPS:hPS/hP2VP, dPS:hPS/hP4VP,
and dPS:hPS/hPMMA heterogeneous interfaces. However, a reference system involving PS on a PS brush
shows no segregation of dPS to the interface.
Polymer blend phase behavior can often be described in terms
of a mean-field interaction parameter ( ).1 For values of e 0,
a binary blend is completely miscible, and weak to moderate
incompatibility will occur for 0.001-0.01, where miscibility

  

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

 

Collections: Physics