Preparation and characterization of poss/dicyclopentadiene nanohybrids

Abstract

In this study, Octabromophenylsilsesquioxane (Br₈OPS) nanocomposite was prepared following Laine’s method. The reaction of Br₈OPS and dicyclopentadiene (DCPD) was investigated in order to produce new nanocomposites by Heck reactions. As the synthesis proceeded, high peaks depend on loading of DCPD, types of catalyst, time and temperature of reaction. Characteristic absorption bands of all condition are appearance of the important absorption band at 1000-1150 cm⁻¹, 1620-1680 cm⁻¹ and 3010-3100 cm⁻¹ due to the formation of the O-Si-O, C=C and C-H group respectively. Furthermore phenyl group is partially formed by DCPD because FTIR spectrum of all samples showed Br group at 500 cm⁻¹ wavenumber. The peaks at 5-6 ppm of NMR is approximately one group, indicating DCPD attached with phenyl ring in which there are three protons (3+1, 4 peaks) in this environment (-CH-). Finally, the alkene protons show several peaks in this area (1-3.5 ppm), as expected C=CH-, -CH2- and -CH-. From MALDI-TOF results, based on the intensity spectrum of all samples only DCPD₅OPS peak at 1779.41 m/z is higher than other peaks. The peaks at 1699, 1857, 1935 and 2173 m/z are very weak and are assigned to structures DCPD₄OPS, DCPD₆OPS, DCPD₇OPS and DCPD8OPS respectively. The products are in formable state with good thermal and mechanical stability and could be used as the starting materials for the formation of transparent nanocomposite systems.