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

  • S. Devaraju
  • M. R. Vengatesan
  • A. Ashok Kumar
  • M. Alagar
Original Paper

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.

Keywords

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

Notes

Acknowledgments

The authors thank to DST (Nanomission), SR/NM/NS-18/2010, New Delhi, Govt. of India., for the financial support and the Department of Mechanical Engineering, Anna University, for providing scanning electron microscopy analysis facility.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • S. Devaraju
    • 1
  • M. R. Vengatesan
    • 1
  • A. Ashok Kumar
    • 2
  • M. Alagar
    • 1
  1. 1.Department of Chemical EngineeringAlagappa College of Technology, Anna UniversityChennaiIndia
  2. 2.Department of ChemistryArulmigu Palaniandavar College of Arts and CulturePalaniIndia

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