Comparison of new periodic, mesoporous, hexylene-bridged polysilsesquioxanes with Pm3n symmetry versus sol-gel polymerized, hexylene-bridged gels

Derong Lin, Lijiang Hu, Hong You, Stephanie H. Tolbert, Douglas A. Loy

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Hexylene-bridged polysilsesquioxanes were synthesized from 1,6-bis(triethoxysilyl)hexane (BESH) by acid- and base-catalyzed, sol-gel polymerizations and surfactant templating in order to compare, for the first time for any bridged polysilsesquioxane, the structures and porosities created by the different methods of preparation. Surfactant templating with Brij 56 under acidic conditions and N-(3-trimethyl-ammoniumpropyl)hexadecylammonium dibromide under basic conditions gave rise to the first periodic mesoporous hexylene-bridged polysilsesquioxanes ever reported. Both exhibited cubic Pm3n mesostructures with narrow pore size distributions (2.2 and 3.82 nm, respectively) and the highest surface areas ever reported for hexylene-bridged polysilsesquioxanes. Hexylene-bridged polysilsesquioxanes prepared under acidic, sol-gel conditions became non-porous during drying, but base-catalyzed sol-gel polymerizations of BESH afforded high surface area xerogels with pore size distributions comparable to periodic mesoporous organosilicas.

Original languageEnglish (US)
Pages (from-to)139-143
Number of pages5
JournalJournal of Non-Crystalline Solids
Volume406
DOIs
StatePublished - Dec 15 2014

Keywords

  • Hexylene bridged polysilsesquioxanes
  • Mesoporous cubic phase
  • Sol-gel polymerized
  • Surfactant templated

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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