Nanoporous materials from stable and metastable structures of 1,2-PB-b-PDMS block copolymers

Lars Schulte, Anne Grydgaard, Mathilde R. Jakobsen, Piotr Przemyslaw Szewczykowski, Fengxiao Guo, Martin Etchells Vigild, Rolf Henrik Berg, Sokol Ndoni

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Experimental procedures used at the preparation and characterization stages of nanoporous materials (NPM) from 1,2-polybutadiene-b-polydimethylsiloxane (1,2-PB-b-PDMS) block copolymers are presented. The NPM were obtained from self-assembled block copolymers after firstly cross-linking 1,2-PB (the matrix component) and secondly degrading PDMS (the expendable component). Depending on the temperature of the cross-linking reaction different morphologies can be ‘frozen’ from the same block copolymer. Starting with a block copolymer precursor of lamellar morphology at room temperature, the gyroid structure or a metastable structure showing hexagonal symmetry (probably HPL) were permanently captured by cross-linking the precursor at 140 °C or at 85 °C, respectively. PDMS was degraded by reaction with tetrabutylamonium fluoride; considerations on the mechanism of cleaving reaction are presented. The characterization of the materials at different stages of preparation includes gravimetry, infrared spectroscopy, small angle x-ray scattering, electron microscopy and isothermal nitrogen adsorption experiments.
Original languageEnglish
JournalPolymer
Volume52
Issue number2
Pages (from-to)422-429
ISSN0032-3861
DOIs
Publication statusPublished - 2011

Keywords

  • 1,2-Polybutadiene
  • Block copolymer
  • Nanoporous

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