Surface-induced ordering in graft copolymer thin films

Shouren Ge, Lantao Guo, Miriam H. Rafailovich, Jonathan Sokolov, Dennis G. Peiffer, Steven A. Schwarz, Ralph H. Colby, William D. Dozier

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The surface-induced ordering of deuterated poly(ethyl acrylate)-polystyrene (dPEA-PS) graft copolymers with different average number x of graft chains per copolymer chain (dPEA-g-xPS,x = 1,3,5) was investigated using neutron reflection, secondary ion mass spectrometry, and atomic force microscopy. The ordering starts only at the vacuum surface and decays through the bulk of the film to the silicon surface. The dPEA-g-3PS thin films (f, fraction of styrene monomers = 0.28) appear to have dPEA-PS lamellar structures and a nearly pure dPEA layer next to the vacuum surface. The dPEA-g-5PS thin films (f = 0.48) are found to be cylindrical except for the top layer, adjacent to the vacuum surface, which is lamellar. On comparison with diblock copolymers, graft copolymers show a phase diagram shift and smaller micelle spacing. We find that long-range order in graft copolymers only occurs within approx. 15 lamellar spacings of the vacuum surface. Linear viscoelasticity of bulk samples reveals that none of the shear-history and low-frequency terminal response complications observed for diblock copolymers are observed for graft copolymers, owing to their lack of long-range order.

Original languageEnglish (US)
Pages (from-to)2911-2915
Number of pages5
JournalLangmuir
Volume15
Issue number8
DOIs
StatePublished - Apr 13 1999

Fingerprint

Graft copolymers
copolymers
Thin films
thin films
Vacuum
Polystyrenes
vacuum
Block copolymers
acrylates
Neutron reflection
polystyrene
spacing
Styrene
Lamellar structures
Viscoelasticity
Micelles
Silicon
Secondary ion mass spectrometry
Grafts
viscoelasticity

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Ge, S., Guo, L., Rafailovich, M. H., Sokolov, J., Peiffer, D. G., Schwarz, S. A., ... Dozier, W. D. (1999). Surface-induced ordering in graft copolymer thin films. Langmuir, 15(8), 2911-2915. https://doi.org/10.1021/la980556o
Ge, Shouren ; Guo, Lantao ; Rafailovich, Miriam H. ; Sokolov, Jonathan ; Peiffer, Dennis G. ; Schwarz, Steven A. ; Colby, Ralph H. ; Dozier, William D. / Surface-induced ordering in graft copolymer thin films. In: Langmuir. 1999 ; Vol. 15, No. 8. pp. 2911-2915.
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Ge, S, Guo, L, Rafailovich, MH, Sokolov, J, Peiffer, DG, Schwarz, SA, Colby, RH & Dozier, WD 1999, 'Surface-induced ordering in graft copolymer thin films', Langmuir, vol. 15, no. 8, pp. 2911-2915. https://doi.org/10.1021/la980556o

Surface-induced ordering in graft copolymer thin films. / Ge, Shouren; Guo, Lantao; Rafailovich, Miriam H.; Sokolov, Jonathan; Peiffer, Dennis G.; Schwarz, Steven A.; Colby, Ralph H.; Dozier, William D.

In: Langmuir, Vol. 15, No. 8, 13.04.1999, p. 2911-2915.

Research output: Contribution to journalArticle

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AU - Ge, Shouren

AU - Guo, Lantao

AU - Rafailovich, Miriam H.

AU - Sokolov, Jonathan

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AU - Schwarz, Steven A.

AU - Colby, Ralph H.

AU - Dozier, William D.

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Ge S, Guo L, Rafailovich MH, Sokolov J, Peiffer DG, Schwarz SA et al. Surface-induced ordering in graft copolymer thin films. Langmuir. 1999 Apr 13;15(8):2911-2915. https://doi.org/10.1021/la980556o