@article { author = {Foorginezhad, Sahar and Zerafat, Mohammad}, title = {Preparation of Highly Crystalline Octavinyl Silsesquioxane Building Blocks via Sol-Gel Technique}, journal = {Nanochemistry Research}, volume = {5}, number = {1}, pages = {14-24}, year = {2020}, publisher = {Iranian Chemical Society}, issn = {2538-4279}, eissn = {2423-818X}, doi = {10.22036/ncr.2020.01.002}, abstract = {Polyhedral oligomeric silsesquioxanes (POSSs) are a class of hybrid materials with a unique structure and properties originated from a combination of organic functional groups and inorganic silica core. Not well-defined synthesis process generally suffers from multistep, complex and especially time-consuming procedure from days to weeks and months. Consequently, in the present study, the effect of various parameters on the synthesis of octavinyl POSS (OV-POSS) nanostructure such as temperature, monomer concentration, reaction time, and rate of monomer addition are investigated. Finally, OV-POSS crystallization is produced under optimal condition through single-step hydrolytic condensation of vinyltrimethoxysilane (VTMS) with 72% yield and a high crystallinity (above 90%) during a reduced time interval of 5 h at 60 °C at a 20 μl.min-1 monomer addition rate. Morphology and size of the as-prepared samples are characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses. Also, the chemical structure is predicted using nuclear magnetic resonance (NMR), FTIR, and EDX.}, keywords = {Polyhedral Oligomeric Silsesquioxanes (POSS),Silsesquioxane,Nanostructure,Crystalline,Vinyltrimethoxysilane}, url = {http://www.nanochemres.org/article_110496.html}, eprint = {http://www.nanochemres.org/article_110496_5c6f8f96ea4ae436c2337e898bbfb6d7.pdf} }