Collapse of porosity during drying of alkylene-bridged polysilsesquioxane gels. Influence of the bridging group length

Douglas A. Loy, James H. Small, Kimberly A. DeFriend, Kennard V. Wilson, Mckenzie Minke, Brigitta M. Baugher, Colleen R. Baugher, Duane A. Schneider, Kenneth J. Shea

Research output: Contribution to journalConference article

1 Scopus citations

Abstract

The introduction of organic substituants into sol-gel materials can often result in networks that collapse during drying to afford non-porous xerogels. This can prove useful if non-porous coatings or membranes are the ultimate objectives. Collapse of porosity is also manifested in bridged polysilsesquioxanes with flexible bridging groups. Alkylene-bridged polysilsesquioxanes are hybrid xerogels whose organic bridging group is an integral constituent of the network polymer that can be systematically varied to probe the influence of its length on the xerogels' porosity and morphology. Our previous studies have shown that hexylene-bridged polysilsesquioxane xerogels prepared from 1,6-bis(triethoxysilyl)hexane under acidic conditions are nonporous while the pentylene-bridged polysilsesquioxanes prepared under the same conditions are porous. We also discovered that the more reactive 1,6-bis(trimethoxysilyl)hexane monomer could polymerize under acidic conditions to afford porous xerogels. Here, we have extended our study of bis(trimethoxysilyl)alkanes to include the heptylene (C7), octylene (C8), nonylene(C9) and decylene (C10) bridges so as to ascertain at what bridging group length the porosity collapses. The morphology of the resulting xerogels was characterized by nitrogen sorption porosimetry and electron microscopy. Solid state NMR was used to structurally characterize the materials.

Original languageEnglish (US)
Article numberEE9.9
Pages (from-to)165-170
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume847
StatePublished - Dec 19 2005
Externally publishedYes
Event2004 Materials Research Society Fall Meeting - Boston, MA, United States
Duration: Nov 30 2004Dec 3 2004

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Loy, D. A., Small, J. H., DeFriend, K. A., Wilson, K. V., Minke, M., Baugher, B. M., Baugher, C. R., Schneider, D. A., & Shea, K. J. (2005). Collapse of porosity during drying of alkylene-bridged polysilsesquioxane gels. Influence of the bridging group length. Materials Research Society Symposium Proceedings, 847, 165-170. [EE9.9].