Phase transition in the surface structure in copolymer films of vinylidene fluoride (70%) with trifluoroethylene (30%)

Journal Article · Tue Feb 15 00:00:00 EST 2000 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.61.5760· OSTI ID:20215518

Choi, Jaewu ^[1]; Borca, C N ^[1]; Dowben, P A ^[1]; Bune, A ^[1]; Poulsen, M ^[1]; Pebley, Shawn ^[1]; Adenwalla, S ^[1]; Ducharme, Stephen ^[1]; Robertson, Lee ^[2]; Fridkin, V M ^[3]

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1. Department of Physics and Astronomy, Behlen Laboratory of Physics, Center for Materials Research and Analysis, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0111 (United States)
2. High Flux Isotope Reactor (HFIR), Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
3. Institute of Crystallography, The Russian Academy of Science, 117333 Moscow, Russia (Russian Federation)

Surface structures and a surface structure phase transition are identified that are distinct from the known bulk ferroelectric-paraelectric phase transition of crystalline copolymer films of vinylidene fluoride (70%) with trifluoroethylene (30%). The temperature-dependent changes in the surface structure are accompanied by the physical rotation of the polar group (CH{sub 2}-CF{sub 2}). These changes in the surface structure are compared to the bulk phase transition. We show that the bulk structural transition, while distinct from the surface, is qualitatively similar in both thick and thin Langmuir-Blodgett-grown films. (c) 2000 The American Physical Society.

• OSTI ID: 20215518
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 61, Issue 8; Other Information: PBD: 15 Feb 2000; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPOLYMERS
THIN FILMS
PHASE TRANSFORMATIONS
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE DEPENDENCE
SURFACES
FERROELECTRIC MATERIALS
EXPERIMENTAL DATA