Microwave-assisted synthesis of SiO2 nanoparticles and its application on the flame retardancy of poly styrene and poly carbonate nanocomposites

Various morphologies  of  silica  nanoparticles  were  synthesized  by  a microwave-assisted  pechini  method.  silica  nanostructures  were synthesized via  a  fast  reaction between  tetra  ethyl ortho  silicate  and ammonia at presence citric acid and other effective agents  in pechini procedure. then  for preparation of polymer-matrix  nanocomposites, sio2  nanoparticles  were  added  to  poly  carbonate  (pc)  and  poly styrene  (ps)  matrices.  nanostructures  were  characterized  by  x-ray diffraction  (xrd), scanning electron microscopy (sem) and fourier transform  infrared  (ft-ir). the  influence of sio2 nanostructures on the  flame  retardancy of  the polymeric matrix was  studied using ul-94 analysis. our results show that the sio2 nanostructure can enhance the  flame retardant property of  the poly carbonate matrix. pc shows better flame retardancy compare to poly styrene.