Polybenzoxazine-silica (PBZ-SiO2) hybrid nanocomposites through in situ sol-gel method

S. Devaraju, M. R. Vengatesan, A. Ashok Kumar, M. Alagar

    Research output: Contribution to journalArticlepeer-review

    36 Scopus citations

    Abstract

    New type of Polybenzoxazine-silica (PBZ-SiO2) hybrid nanocomposites was prepared through in situ sol-gel method. Benzoxazine was synthesized using bisphenol-A, trans-4-aminocyclohexanol hydrochloride and formaldehyde solution through Mannich condensation reaction and was characterized by FT-IR, 1HNMR and 13CNMR spectroscopy. The methodology adopted in the present study involves to formation of hydrogen bond interaction between the benzoxazine monomer and the silica matrix, followed by the ring opening polymerization of benzoxazine monomer through thermal curing to obtain a red brown transparent PBZ-SiO2 hybrid. The formation of hybrid nanocomposites was confirmed by FT-IR. Thermal and morphological properties of the hybrid materials were investigated by the differential scanning calorimetry (DSC), thermo gravimetric analysis (TGA), scanning electron microscopy (SEM). The PBZ-SiO2 hybrids show improved thermal properties and glass transition (Tg) temperature. The nitrogen porosimetry study was carried out to confirm the nanometer level integration of polybenzoxazine in the PBZ-SiO2 hybrid nanocomposites.

    Original languageBritish English
    Pages (from-to)33-40
    Number of pages8
    JournalJournal of Sol-Gel Science and Technology
    Volume60
    Issue number1
    DOIs
    StatePublished - Oct 2011

    Keywords

    • Morphology
    • Organic-inorganic hybrid nanocomposites
    • Polybenzoxazine
    • Sol-gel process
    • Tetraethoxysilane
    • Thermal stability

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