Hydroxyl Terminated Hydrophilic Silanes

Yuya Tachibana, Xiangke Shi, Daniel Graiver, Ramani Narayan

    Research output: Research - peer-reviewArticle

    • 5 Citations

    Abstract

    Hydroxyakyl terminated silanes were prepared by reacting 3-aminopropyl alkoxysilanes with ethylene carbonate. Unlike most silanes, these hydrophilic silanes are partially hydrolyzed in water and the siloxane oligomers thus obtained remain soluble in the water. Further condensation leads to water soluble linear or branched polysiloxanes depending on the structure of the hydroxylalkyl terminated silane. The water solubility is not limited to a narrow pH range and does not require alcohols (or other additives). The preparation method of these silanes was found to proceed smoothly at RT with no need for a solvent or a catalyst. The reactions followed second order reaction kinetics irrespective of the number of alkoxy groups attached to the silicon atom. Some condensation was unavoidable even in the absence of any catalyst but the viscosity remained low (0. 10-0. 16 Pa·sec) and was primarily dependent on the density of branching and the extent of the hydrogen bonding. The structures of these silanes were confirmed by FTIR, 1H NMR and 29Si NMR.

    LanguageEnglish (US)
    Pages167-174
    Number of pages8
    JournalSilicon
    Volume4
    Issue number3
    DOIs
    StatePublished - Jul 2012

    Profile

    Silanes
    Hydroxyl Radical
    Water
    Siloxanes
    Condensation
    Nuclear magnetic resonance
    Catalysts
    Silicon
    Oligomers
    Reaction kinetics
    Hydrogen bonds
    Solubility
    Alcohols
    Viscosity
    Atoms
    ethylene carbonate
    alkoxyl radical
    Silicones
    Carbonates
    Ethylene

    Keywords

    • 3-aminopropyl alkoxysilane
    • Ethylene carbonate
    • Hydrophilic silane
    • Reaction kinetics
    • Structure characterization

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials

    Cite this

    Tachibana, Y., Shi, X., Graiver, D., & Narayan, R. (2012). Hydroxyl Terminated Hydrophilic Silanes. Silicon, 4(3), 167-174. DOI: 10.1007/s12633-012-9118-y

    Hydroxyl Terminated Hydrophilic Silanes. / Tachibana, Yuya; Shi, Xiangke; Graiver, Daniel; Narayan, Ramani.

    In: Silicon, Vol. 4, No. 3, 07.2012, p. 167-174.

    Research output: Research - peer-reviewArticle

    Tachibana, Y, Shi, X, Graiver, D & Narayan, R 2012, 'Hydroxyl Terminated Hydrophilic Silanes' Silicon, vol 4, no. 3, pp. 167-174. DOI: 10.1007/s12633-012-9118-y
    Tachibana Y, Shi X, Graiver D, Narayan R. Hydroxyl Terminated Hydrophilic Silanes. Silicon. 2012 Jul;4(3):167-174. Available from, DOI: 10.1007/s12633-012-9118-y
    Tachibana, Yuya ; Shi, Xiangke ; Graiver, Daniel ; Narayan, Ramani. / Hydroxyl Terminated Hydrophilic Silanes. In: Silicon. 2012 ; Vol. 4, No. 3. pp. 167-174
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    AU - Graiver,Daniel

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    N2 - Hydroxyakyl terminated silanes were prepared by reacting 3-aminopropyl alkoxysilanes with ethylene carbonate. Unlike most silanes, these hydrophilic silanes are partially hydrolyzed in water and the siloxane oligomers thus obtained remain soluble in the water. Further condensation leads to water soluble linear or branched polysiloxanes depending on the structure of the hydroxylalkyl terminated silane. The water solubility is not limited to a narrow pH range and does not require alcohols (or other additives). The preparation method of these silanes was found to proceed smoothly at RT with no need for a solvent or a catalyst. The reactions followed second order reaction kinetics irrespective of the number of alkoxy groups attached to the silicon atom. Some condensation was unavoidable even in the absence of any catalyst but the viscosity remained low (0. 10-0. 16 Pa·sec) and was primarily dependent on the density of branching and the extent of the hydrogen bonding. The structures of these silanes were confirmed by FTIR, 1H NMR and 29Si NMR.

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