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Investigation of Blend Miscibility of a Ternary PS/PCHMA/PMMA System Using SIMS and Mean-Field Theory
 

Summary: Investigation of Blend Miscibility of a Ternary PS/PCHMA/PMMA
System Using SIMS and Mean-Field Theory
Shane E. Harton, Tadanori Koga, Frederick A. Stevie, Tohru Araki, and
Harald Ade*,
Department of Materials Science & Engineering, North Carolina State University, Raleigh,
North Carolina 27695; Department of Materials Science & Engineering, Stony Brook University,
Stony Brook, New York 11794; Analytical Instrumentation Facility, North Carolina State University,
Raleigh, North Carolina 27695; and Department of Physics, North Carolina State University, Raleigh,
North Carolina 27695
Received July 21, 2005; Revised Manuscript Received October 11, 2005
ABSTRACT: Poly(cyclohexyl methacrylate) (PCHMA) and polystyrene (PS) are miscible with each other,
but each is highly immiscible with PMMA. Identifiable by the asymmetries in the binary mean-field
interaction parameters , PS preferentially segregates to the PCHMA/PMMA interface. Secondary ion
mass spectrometry was used to provide real-space depth profiles of deuterated PS (dPS) in a miscible
blend with PCHMA. The initial dPS concentration was varied from 5 to 20% (v/v), and the blend film
was annealed at 150 C on a film of PMMA for 42 h. X-ray reflectometry was used to determine the
interfacial width between PCHMA and PMMA at 150 C. Using self-consistent mean-field theory, good
agreement was found between the experimental and theoretical interfacial excess Z* of dPS at each
concentration. Because of their similar glass transition temperatures (100 C for PS and PCHMA) and
the ability of PS and PCHMA to be controllably synthesized with low polydispersities, we anticipate this

  

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

 

Collections: Physics