A new series of polybenzoxazine-silica (PBZ-SiO2) hybrid nanocomposites were developed using hydroxyl terminal benzoxazine monomers (BZ-OH) and TEOS through the in-situ sol—gel method. The formation of hybrid nanocomposites was confirmed by FT-IR. The presence
of inter-cross linked silica networks in PBZ-SiO2 hybrids was accounted for their excellent thermal stability and better char yield than those of neat PBZs. The confinement of the mobility of the polymer chain arose from the introduction of silica particles into the polybenzoxazine
matrix increased the glass transition temperature of the hybrids. The values of dielectric constant of the nanocomposites were decreased with increased silica content. The reduction in percentage water uptake may be associated with the inherent hydrophobic nature of Si—O—Si network
present in the PBZ-SiO2 hybrid systems. The shift in both the absorption and emission wavelength revealed the successful incorporation of silica particles through thermal ring opening polymerization of benzoxazine and TEOS. The molecular level dispersion of SiO2 particles
in the polybenzoxazine matrices was evidenced from morphological studies.
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Hydroxyl Terminal Benzoxazine;
Organic-Inorganic Hybrid Nanocomposites;
Document Type: Research Article
Department of Chemistry, Valliammai Engineering College, Kattankulathur, Kancheepuram 603203, India
Department of Applied Science and Technology, Anna University, Chennai 600025, India
Publication date: August 1, 2017
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