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COLLAPSE OF POROSITY DURING DRYING OF ALKYLENE-BRIDGED POLYSILSESQUIOXANE GELS. INFLUENCE OF THE BRIDGING GROUP LENGTH

Published online by Cambridge University Press:  01 February 2011

Douglas A. Loy ,
James H. Small ,
Kimberly A. DeFriend ,
Kennard V. Wilson Jr ,
McKenzie Minke ,
Brigitta M. Baugher ,
Colleen R. Baugher ,
Duane A. Schneider  and
Kenneth J. Shea
Douglas A. Loy
Affiliation:
Polymers and Coatings Department, Los Alamos National Laboratories, PO Box 1662, MS E549, Los Alamos, NM 87545, U.S.A.
James H. Small
Affiliation:
Polymers and Coatings Department, Los Alamos National Laboratories, PO Box 1662, MS E549, Los Alamos, NM 87545, U.S.A.
Kimberly A. DeFriend
Affiliation:
Polymers and Coatings Department, Los Alamos National Laboratories, PO Box 1662, MS E549, Los Alamos, NM 87545, U.S.A.
Kennard V. Wilson Jr
Affiliation:
Polymers and Coatings Department, Los Alamos National Laboratories, PO Box 1662, MS E549, Los Alamos, NM 87545, U.S.A.
McKenzie Minke
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185, U.S.A.
Brigitta M. Baugher
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185, U.S.A.
Colleen R. Baugher
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185, U.S.A.
Duane A. Schneider
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185, U.S.A.
Kenneth J. Shea
Affiliation:
Department of Chemistry, University of California Irvine, U.S.A.
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Abstract

The introduction of organic substituents 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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 847: Symposium EE – Organic/Inorganic Hybrid Materials , 2004 , EE9.9
Copyright
Copyright © Materials Research Society 2005

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References

REFERENCES

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