Adsorption of Poly(2-vinylpyridine)-Poly(styrene) Block Copolymers from Toluene Solutions

Edward Parsonage, Matthew Tirrell, Hiroshi Watanabe, Ralph G. Nuzzo

Research output: Contribution to journalArticlepeer-review

Abstract

We have studied the adsorption of diblock copolymers of poly(2-vinylpyridine) (PVP)-poly-(styrene) (PS) from toluene solutions onto oxidized silicon and mica substrates. Adsorbed amounts for copolymers of various molecular weight and composition were measured by scintillation counting from tritium-labeled adsorbed layers and by X-ray photoemission spectroscopy. We find a dimensionless surface density σ$* to be a unique function of a copolymer block size asymmetry ratio. Within this correlation, we see two regimes of behavior. For copolymers of moderate asymmetry, the surface density σ is influenced more strongly by the molecular weight of the adsorbing PVP block. These results agree well with a model by Marques et al. For copolymers with large PS blocks (high asymmetry), the surface density is determined primarily by the molecular weight of the PS block. Angle-resolved XPS measurements on dry adsorbed layers indicate a layered structure with PS segments preferentially located at the top surface. These results are supported by contact angle measurements on the dry adsorbed layers.

Original languageEnglish (US)
Pages (from-to)1987-1995
Number of pages9
JournalMacromolecules
Volume24
Issue number8
DOIs
StatePublished - Apr 1 1991

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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