A new class of nanotitania reinforced polybenzoxazine (nTiO2/PBZ) hybrid nanocomposites was synthesized using newly designed phthalide cardo chain extended imine skeletal linked maleimido end capped polybenzoxazine (PHM-PBZ) and nTiO2 through in-situ sol-gel method. The formation of hybrid nanocomposites was confirmed by NMR and FT-IR spectra. The structurally stable nTiO2 present in the nTiO2/PBZ hybrids accounted their exceptional thermal stability and good char yield. The restricted motion of flexible polymeric chain resulted from the inclusion of nTiO2 in the PBZ system increased the glass transition temperature ( T g) to a higher percentage than that of neat PBZ system. With the successive enhancement in the incorporation of nTiO2, the synthesized nanocomposites exhibited better thermal stability, higher flame retardancy and lesser water absorption behaviour than the of neat PBZ. The sequential increments in the loading level of nTiO2 onto the PBZ matrices caused the lower value of dielectric constant than that of neat PBZ. The homogeneity and successful dispersion of the nTiO2 fillers in the PBZ matrix were ascertained from the strong fluorescent emissions observed in the wavelength range of 300–550 nm through optical studies. Scanning electron microscope and transmission electron microscopic micrographs evidenced the successful incorporation of nTiO2 as can be seen from the different morphology at the nanoscale level in the PBZ matrix. This kind of structurally designed nTiO2/PBZ nanocomposites may find multifaceted applications in the form of adhesives, encapsulants, matrices and sealants and in the fields of automobile and microelectronics applications for better performance and longevity.
Novel polybenzoxazine-silica (nSiO2/PBZ) hybrid nanocomposites were designed and synthesized
using carbazole terminal pyrenyl pyridine core imine skeletal benzoxazine monomer (PYCBZ) and
nanosilica (nSiO2) through in situ sol-gel method. The FT-IR and Raman spectral studies ascertained
the formation of nanosilica reinforced polybenzoxazine hybrid nanocomposites. The nSiO2/PBZ hybrid
nanocomposites exhibited excellent thermal stability and higher char yield than that of neat PBZ. The
elevation in glass transition temperature of the nanocomposites was evidenced by the limited motion
of the polymeric network with the introduction of nanosilica particles in the PBZ matrices. The
hydrophobic nature of a less polar nSiO2 in the composites zipped the water uptake behaviour of
(nSiO2/PBZ) hybrid nanocomposites to low percentage. The shift in the absorption peak reveals that
the nanosilica particles were successfully incorporated through thermal ring opening polymerization
of benzoxazine. The homogeneous reinforcement of nSiO2 particles retains the fluorescent properties
of polybenzoxazine. The uniform molecular level dispersion of nano SiO2 onto polybenzoxazine
networks were confirmed from transmission electron microscope and scanning electron microscope
images.
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