Porosity in Polysilsesquioxane Xerolgels

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Polymerization of organotrialkoxysilanes is a convenient method for introducing organic functionality into hybrid organic-inorganic materials. However, not much is known about the effects of the organic substituent on the porosity of the resulting xerogels. In this study, we prepared a series of polysilsesquioxane xerogels from organotrialkoxysilanes, RSi(OR{sup 1}){sub 3}, with different organic groups (R = H, Me, Et dodecyl, hexadecyl, octadecyl, vinyl, chloromethyl, (p-chloromethyl) phenyl, cyanoethyl). Polymerizations of the monomers were carried out under a variety of conditions, varying monomer concentration, type of catalyst, and alkoxide substituent. The effect of the organic substituent on the sol-gel process was often dramatic. ... continued below

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6 p.

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Baugher, B.M.; Loy, D.A. & Rahimian, K. August 17, 1999.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Polymerization of organotrialkoxysilanes is a convenient method for introducing organic functionality into hybrid organic-inorganic materials. However, not much is known about the effects of the organic substituent on the porosity of the resulting xerogels. In this study, we prepared a series of polysilsesquioxane xerogels from organotrialkoxysilanes, RSi(OR{sup 1}){sub 3}, with different organic groups (R = H, Me, Et dodecyl, hexadecyl, octadecyl, vinyl, chloromethyl, (p-chloromethyl) phenyl, cyanoethyl). Polymerizations of the monomers were carried out under a variety of conditions, varying monomer concentration, type of catalyst, and alkoxide substituent. The effect of the organic substituent on the sol-gel process was often dramatic. In many cases, gels were formed only at very high monomer concentration and/or with only one type of catalyst. All of the gels were processed as xerogels and characterized by scanning electron microscopy and nitrogen sorption porosimetry to evaluate their pore structure.

Physical Description

6 p.

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OSTI as DE00014104

Medium: P; Size: 6 pages

Source

  • MRS Proceedings, San Francisco, CA (US), 04/05/1999--04/09/1999

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  • Report No.: SAND99-2751C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 14104
  • Archival Resource Key: ark:/67531/metadc622137

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  • August 17, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 11, 2017, 1:25 p.m.

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Baugher, B.M.; Loy, D.A. & Rahimian, K. Porosity in Polysilsesquioxane Xerolgels, article, August 17, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc622137/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.