Substituent effects on the sol-gel chemistry of organotrialkoxysilanes

D. A. Loy, B. M. Baugher, C. R. Baugher, D. A. Schneider, K. Rahimian

Research output: Contribution to journalArticle

266 Scopus citations

Abstract

Silsesquioxanes are a family of siloxane network polymers that have become important as vehicles for introducing organic functionalities into sol-gel materials. However, there has not been a systematic study of the capacity of organotrialkoxysilanes to form gels through the sol-gel process. In this study, we examined the sol-gel chemistry of organotrialkoxysilanes (RSi(OR′)3) with different organic groups (R = H, Me, Et, Pr, i-Pr, n-Bu, i-Bu, t-Bu, hexyl, octyl, decyl, dodecyl, hexadecyl, octadecyl, cyclohexyl, vinyl, phenyl, benzyl, phenethyl, chloromethyl, chloromethylphenyl, and tridecafluoro-1,1,2,2-tetrahydrooctyl) with methoxide or ethoxide substituents on silicon, at varying monomer concentrations, and under acidic, neutral, and basic conditions. Gels were obtained from the sol-gel polymerization of the monomers with R′ = Me and R = H, Me, vinyl, chloromethyl, chloromethylphenyl, hexadecyl, and octadecyl and R′ = Et and R = H, Me, Et, chloromethyl, vinyl, dodecyl, hexadecyl, and octadecyl. Formation of gels, even with these monomers, was often circumvented by phase separation phenomena, giving rise to crystalline oligomers, resinous materials, and precipitates. Gels obtained from these polymerizations were processed as xerogels and characterized by solid-state NMR, microscopy, and nitrogen sorption porosimetry.

Original languageEnglish (US)
Pages (from-to)3624-3632
Number of pages9
JournalChemistry of Materials
Volume12
Issue number12
DOIs
StatePublished - Dec 1 2000
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Substituent effects on the sol-gel chemistry of organotrialkoxysilanes'. Together they form a unique fingerprint.

  • Cite this

    Loy, D. A., Baugher, B. M., Baugher, C. R., Schneider, D. A., & Rahimian, K. (2000). Substituent effects on the sol-gel chemistry of organotrialkoxysilanes. Chemistry of Materials, 12(12), 3624-3632. https://doi.org/10.1021/cm000451i