Hydrolysis and Condensation of Hydrophilic Alkoxysilanes Under Acidic Conditions

Xiangke Shi, Daniel Graiver, Ramani Narayan

    Research output: Contribution to journalArticle

    • 11 Citations

    Abstract

    A hydrophilic silane was obtained from the reaction of ethylene carbonate and 3-aminopropyldiethoxymethylsilane. This silane undergoes rearrangement to yield an AB 2-type hyperbranched polymer under anhydrous conditions but hydrolyzes and condenses to produce linear siloxanes under acid hydrolysis. The hydrolysis and condensation reactions as a function of time, HCl concentration and water content were studied by 29Si NMR. The compositions of the silanol containing hydrolysis intermediates and the siloxanes condensation products were identified under different conditions. The instantaneous composition was found to depend on the specific combination of the acid and the water. Under certain conditions the intermediate silane-diols were stable and did not condense even under mild acidic conditions.

    Original languageEnglish (US)
    Pages (from-to)109-119
    Number of pages11
    JournalSilicon
    Volume4
    Issue number2
    DOIs
    StatePublished - Apr 2012

    Profile

    Hydrolysis
    Silanes
    Condensation
    Acids
    Chemical analysis
    African horse sickness virus
    Dye Dilution Technique
    Condensation reactions
    Water content
    Carbonates
    Ethylene
    Nuclear magnetic resonance
    Polymers
    Water
    Dyneins
    Dapsone

    Keywords

    • 3-aminopropyldiethoxymethylsilane
    • Si NMR
    • Condensation
    • Ethylene carbonate
    • Hydrolysis
    • Hyperbranched polymers

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials

    Cite this

    Hydrolysis and Condensation of Hydrophilic Alkoxysilanes Under Acidic Conditions. / Shi, Xiangke; Graiver, Daniel; Narayan, Ramani.

    In: Silicon, Vol. 4, No. 2, 04.2012, p. 109-119.

    Research output: Contribution to journalArticle

    Shi, Xiangke; Graiver, Daniel; Narayan, Ramani / Hydrolysis and Condensation of Hydrophilic Alkoxysilanes Under Acidic Conditions.

    In: Silicon, Vol. 4, No. 2, 04.2012, p. 109-119.

    Research output: Contribution to journalArticle

    @article{9a6ad3ded28741108ad2dffd4b85e575,
    title = "Hydrolysis and Condensation of Hydrophilic Alkoxysilanes Under Acidic Conditions",
    abstract = "A hydrophilic silane was obtained from the reaction of ethylene carbonate and 3-aminopropyldiethoxymethylsilane. This silane undergoes rearrangement to yield an AB 2-type hyperbranched polymer under anhydrous conditions but hydrolyzes and condenses to produce linear siloxanes under acid hydrolysis. The hydrolysis and condensation reactions as a function of time, HCl concentration and water content were studied by 29Si NMR. The compositions of the silanol containing hydrolysis intermediates and the siloxanes condensation products were identified under different conditions. The instantaneous composition was found to depend on the specific combination of the acid and the water. Under certain conditions the intermediate silane-diols were stable and did not condense even under mild acidic conditions.",
    keywords = "3-aminopropyldiethoxymethylsilane, Si NMR, Condensation, Ethylene carbonate, Hydrolysis, Hyperbranched polymers",
    author = "Xiangke Shi and Daniel Graiver and Ramani Narayan",
    year = "2012",
    month = "4",
    doi = "10.1007/s12633-012-9108-0",
    volume = "4",
    pages = "109--119",
    journal = "Silicon",
    issn = "1876-990X",
    publisher = "Springer Netherlands",
    number = "2",

    }

    TY - JOUR

    T1 - Hydrolysis and Condensation of Hydrophilic Alkoxysilanes Under Acidic Conditions

    AU - Shi,Xiangke

    AU - Graiver,Daniel

    AU - Narayan,Ramani

    PY - 2012/4

    Y1 - 2012/4

    N2 - A hydrophilic silane was obtained from the reaction of ethylene carbonate and 3-aminopropyldiethoxymethylsilane. This silane undergoes rearrangement to yield an AB 2-type hyperbranched polymer under anhydrous conditions but hydrolyzes and condenses to produce linear siloxanes under acid hydrolysis. The hydrolysis and condensation reactions as a function of time, HCl concentration and water content were studied by 29Si NMR. The compositions of the silanol containing hydrolysis intermediates and the siloxanes condensation products were identified under different conditions. The instantaneous composition was found to depend on the specific combination of the acid and the water. Under certain conditions the intermediate silane-diols were stable and did not condense even under mild acidic conditions.

    AB - A hydrophilic silane was obtained from the reaction of ethylene carbonate and 3-aminopropyldiethoxymethylsilane. This silane undergoes rearrangement to yield an AB 2-type hyperbranched polymer under anhydrous conditions but hydrolyzes and condenses to produce linear siloxanes under acid hydrolysis. The hydrolysis and condensation reactions as a function of time, HCl concentration and water content were studied by 29Si NMR. The compositions of the silanol containing hydrolysis intermediates and the siloxanes condensation products were identified under different conditions. The instantaneous composition was found to depend on the specific combination of the acid and the water. Under certain conditions the intermediate silane-diols were stable and did not condense even under mild acidic conditions.

    KW - 3-aminopropyldiethoxymethylsilane

    KW - Si NMR

    KW - Condensation

    KW - Ethylene carbonate

    KW - Hydrolysis

    KW - Hyperbranched polymers

    UR - http://www.scopus.com/inward/record.url?scp=84859754777&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84859754777&partnerID=8YFLogxK

    U2 - 10.1007/s12633-012-9108-0

    DO - 10.1007/s12633-012-9108-0

    M3 - Article

    VL - 4

    SP - 109

    EP - 119

    JO - Silicon

    T2 - Silicon

    JF - Silicon

    SN - 1876-990X

    IS - 2

    ER -