Open AccessStructurally Designed Imine Skeletal Pyrenyl Pendant Pyridine Core Polybenzoxazine nSiO2/PBZ Hybrid Polymer Nanocomposites
Author(s) -
S. Gunasekaran,
L. Devaraj Stephen,
V. Arivalagan,
M. Soundarrajan
Publication year - 2021
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2021.23094
Subject(s) - nanocomposite , chemistry , thermal stability , polymerization , chemical engineering , polymer , glass transition , monomer , polymer chemistry , hybrid material , organic chemistry , engineering
Novel polybenzoxazine-silica (nSiO2/PBZ) hybrid nanocomposites were designed and synthesizedusing carbazole terminal pyrenyl pyridine core imine skeletal benzoxazine monomer (PYCBZ) andnanosilica (nSiO2) through in situ sol-gel method. The FT-IR and Raman spectral studies ascertainedthe formation of nanosilica reinforced polybenzoxazine hybrid nanocomposites. The nSiO2/PBZ hybridnanocomposites exhibited excellent thermal stability and higher char yield than that of neat PBZ. Theelevation in glass transition temperature of the nanocomposites was evidenced by the limited motionof the polymeric network with the introduction of nanosilica particles in the PBZ matrices. Thehydrophobic 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 thatthe nanosilica particles were successfully incorporated through thermal ring opening polymerizationof benzoxazine. The homogeneous reinforcement of nSiO2 particles retains the fluorescent propertiesof polybenzoxazine. The uniform molecular level dispersion of nano SiO2 onto polybenzoxazinenetworks were confirmed from transmission electron microscope and scanning electron microscopeimages.