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Investigation by Combined Solid-State NMR and SAXS Methods of the Morphology and Domain Size in Polystyrene-b-Polyethylene Oxide-b-Polystyrene Triblock Copolymers

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Author

  • Fábio A. Bonk
  • Stefano Caldarelli
  • Trang Phan
  • Denis Bertin
  • Eduardo de Azevedo
  • Gerson L. Mantovani
  • Tito J. Bonagamba
  • Tomás Plivelic
  • Iris C. Torriani

Summary, in English

The microphase structure of a series of polystyrene-b-polyethylene oxide-b-polystyrene (SEOS) triblock copolymers with different compositions and molecular weights has been studied by solid-state NMR, DSC, wide and small angle X-ray scattering (WAXS and SAXS). WAXS and DSC measurements were used to detect the presence of crystalline domains of polyethylene-oxide (PEO) blocks at room temperature as a function of the copolymer chemical composition. Furthermore, DSC experiments allowed the determination of the melting temperatures of the crystalline part of the PEO blocks. SAXS measurements, performed above and below the melting temperature of the PEO blocks, revealed the formation of periodic structures, but the absence or the weakness of high order reflections peaks did not allow a clear assessment of the morphological structure of the copolymers. This information was inferred by combining the results obtained by SAXS and 1H NMR spin diffusion experiments, which also provided an estimation of the size of the dispersed phases of the nanostructured copolymers.

Department/s

Publishing year

2010

Language

English

Pages

55-64

Publication/Series

Journal of Polymer Science. Part B, Polymer Physics

Volume

48

Issue

1

Document type

Journal article

Publisher

John Wiley & Sons Inc.

Topic

  • Physical Sciences
  • Natural Sciences

Keywords

  • SAXS
  • NMR
  • ABA triblock copolymers
  • block copolymers

Status

Published

Research group

  • Department of Synchrotron Radiation Instrumentation

ISBN/ISSN/Other

  • ISSN: 0887-6266