Sonochemical Synthesis of Spherical Silica Nanoparticles and Polymeric Nanocomposites |
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| Authors: | Maryam Masjedi-Arani Davood Ghanbari Masoud Salavati-Niasari Samira Bagheri |
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| Institution: | 1.Institute of Nano Science and Nano Technology,University of Kashan,Kashan,Islamic Republic of Iran;2.Young Researchers and Elite Club, Arak Branch,Islamic Azad University,Arak,Islamic Republic of Iran;3.Centre for Research in Nanotechnology & Catalysis (NANOCAT); Institute of Postgraduate Studies (IPS),University of Malaya,Kuala Lumpur,Malaysia |
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| Abstract: | In this work spherical SiO2 nanoparticles were synthesized by sonochemical method using a new Schiff-base as a capping agent. The silica nanoparticles were obtained by hydrolysis of tetraethyl orthosilicate in aqueous alcohol solution. The effect of different parameters such as molar concentration of Schiff-base ligands and ultrasonic irradiation on the morphology and size of the products was examined. The results demonstrated that applying the appropriate amount of Schiff-base could be effective in control of particle size. The influence of SiO2 nanostructures on the flame retardancy of the poly styrene, poly vinyl alcohol, cellulose acetate and ethyl cellulose was studied. In-situ and ex situ nanocomposites were investigated and results confirm that flame retardancy of in situ nanocomposites were better than ex situ samples. HO···Si–O–Si···OH barrier prevents reaching of flame, heat and oxygen to the polymeric nanocomposites. |
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