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Title: Porosity in polysilsesquioxane xerogels

Abstract

Polysilsesquioxanes, [RSiO{sub 1.5}]{sub n} are a class of hybrid organic-inorganic materials in which silicon atoms are linked with up to three siloxane bonds to other monomer units in the polymer and the organic group is a pendent functionality. Polysilsesquioxanes are prepared by the hydrolysis and condensation of organotrialkoxysilanes (Scheme l). Organotrialkoxysilanes RSi(OR{prime}){sub 3}, have been extensively used as coupling agents for composites or surface treatments for materials. Polysilsesquioxanes have become increasingly popular for generating specialty coatings such as low k dielectric materials for microelectronic applications. While there is extensive information on the formation of polysilsesquioxanes, there has not been a survey of the ability of organotrialkoxysilanes to form gels until recently. The formation of polysilsesquioxanes gels has been shown to be very sensitive to the nature of the organic group. Many monomers will only form soluble oligomers or polymers upon hydrolysis and condensation, even when the reaction is conducted solvent-free with neat monomer and aqueous catalyst. Furthermore, there is little information concerning the influence of the organic group, R, on the porosity of the polysilsesquioxanes gels that are formed. In this paper the authors describe the preparation of polysilsesquioxane gels where R = H, methyl, ethyl, cyanoethyl, vinyl, dodecyl, hexadecyl,more » octadecyl, chloromethyl, and chloromethylphenyl, and the characterization of the porosity of the respective xerogels. Gels were prepared from the hydrolysis and condensation of organotrimethoxysilanes, RSi(OEt){sub 3}, and organotriethoxy-silanes, RSi(OEt){sub 3}.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
756100
Report Number(s):
SAND2000-1155C
TRN: AH200021%%122
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Polymer Preprints/American Chemical Society National Meeting, San Francisco, CA (US), 03/26/2000--03/31/2000; Other Information: PBD: 9 May 2000
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ORGANIC POLYMERS; ORGANIC SILICON COMPOUNDS; SILANES; HYDROLYSIS; DEHYDROCYCLIZATION; GELS; POROSITY

Citation Formats

LOY,DOUGLAS A., SCHNEIDER,DUANE A., BAUGHER,BRIGITTA M., and RAHIMIAN,KAMYAR. Porosity in polysilsesquioxane xerogels. United States: N. p., 2000. Web.
LOY,DOUGLAS A., SCHNEIDER,DUANE A., BAUGHER,BRIGITTA M., & RAHIMIAN,KAMYAR. Porosity in polysilsesquioxane xerogels. United States.
LOY,DOUGLAS A., SCHNEIDER,DUANE A., BAUGHER,BRIGITTA M., and RAHIMIAN,KAMYAR. Tue . "Porosity in polysilsesquioxane xerogels". United States. https://www.osti.gov/servlets/purl/756100.
@article{osti_756100,
title = {Porosity in polysilsesquioxane xerogels},
author = {LOY,DOUGLAS A. and SCHNEIDER,DUANE A. and BAUGHER,BRIGITTA M. and RAHIMIAN,KAMYAR},
abstractNote = {Polysilsesquioxanes, [RSiO{sub 1.5}]{sub n} are a class of hybrid organic-inorganic materials in which silicon atoms are linked with up to three siloxane bonds to other monomer units in the polymer and the organic group is a pendent functionality. Polysilsesquioxanes are prepared by the hydrolysis and condensation of organotrialkoxysilanes (Scheme l). Organotrialkoxysilanes RSi(OR{prime}){sub 3}, have been extensively used as coupling agents for composites or surface treatments for materials. Polysilsesquioxanes have become increasingly popular for generating specialty coatings such as low k dielectric materials for microelectronic applications. While there is extensive information on the formation of polysilsesquioxanes, there has not been a survey of the ability of organotrialkoxysilanes to form gels until recently. The formation of polysilsesquioxanes gels has been shown to be very sensitive to the nature of the organic group. Many monomers will only form soluble oligomers or polymers upon hydrolysis and condensation, even when the reaction is conducted solvent-free with neat monomer and aqueous catalyst. Furthermore, there is little information concerning the influence of the organic group, R, on the porosity of the polysilsesquioxanes gels that are formed. In this paper the authors describe the preparation of polysilsesquioxane gels where R = H, methyl, ethyl, cyanoethyl, vinyl, dodecyl, hexadecyl, octadecyl, chloromethyl, and chloromethylphenyl, and the characterization of the porosity of the respective xerogels. Gels were prepared from the hydrolysis and condensation of organotrimethoxysilanes, RSi(OEt){sub 3}, and organotriethoxy-silanes, RSi(OEt){sub 3}.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}

Conference:
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