Design and Development of Allyl Terminal Triaryl Pyridine Core Skeletal Modified Benzoxazines Based Polybenzoxazine-Silica (PBZ-SiO2) Hybrid Nanocomposites

摘要

A series of skeletal modified novel allyl terminal benzoxazines (BZ-als) have been successfully designed and developed using triaryl pyridine core diamines via conventional one-pot Mannich reaction. The polybenzoxazine-silica (PBZ-SiO2) nanocomposites were prepared by thermal ring-opening polymerization of benzoxazines with different weight percentages of 3-methacryloxypropyltrimethoxysilane through in-situ sol gel method. The formation of hybrid nanocomposites was confirmed by FT-IR. The substantial enhancement in the glass transition temperature was remarked for PBZ-SiO2 hybrids than their respective neat PBZ systems. The dielectric constant of the nanocomposites was found decreased with an increment in the silica content. The shift in the characteristic absorption/emissions corresponding to the neat PBZs toward lower wavelength ascertains the successful formation of PBZ-SiO2 nanocomposites. The discernible phase behaviour observed morphological studies reveals the molecular-level dispersion of silica particles over the organic networks.