جستجوی مقالات مرتبط با کلیدواژه « Ferrocene » در نشریات گروه « فنی و مهندسی »

 Among the burning rate catalysts (BRCs), ferrocene-based ones have shown better performance; but show volatility problem. Therefore, the use of ferrocene derivatives in order to make compatible with hydroxyl terminated polybutadiene (HTPB) prepolymer, is a novel trend which is recently interested in the related researches.

 In this research, at first, vinyl ferrocene monomer (VFM) were in-situ homopolymerized to prepare poly (vinyl ferrocene) (PVF)in the presence of hydroxyl terminated polybutadiene (HTPB) prepolymer at three different conditions(with and without BPO as initiator and different amounts of VFM).Then, blend of PVF/HTPB were characterized using FT-IR, 1HNMR and GPC analyzes. In the second part, energetic composites containing PVF/HTPB blend were prepared and thermal properties of prepared samples investigated and compared with energetic composites containing conventional catalysts using TGA.

The GPC results showed that the main peak was larger and wider due to the increase in the average molecular weight of PVF/HTPB blend. Comparison of thermal analysis showed that energetic composites based on PVF/HTPB blend catalyst perform better than common catalysts and more reduces the AP decomposition temperature. PVF/HTPB blend act as a potential BRC in energetic composites in which migration problem reduce due to in-situ blending of VFM to HTPB.

In this study a novel method has been introduced for the synthesis of 4-hydroxylbutylferrocene by the reaction of lithiated ferrocene with THF in the presence of chlorotrimethylsilane under argon atmosphere. Essential optimization on the reaction solvent, temperature and molar ratio of reactants was conducted and finally 4-hydroxybutylferrocene was obtained in the yield of 78% using this method. Reaction of this compound with phosphoros trichloride result in the formation of 4-chlorobutylferrocene as the basic fundamental precursor for the synthesis of butacene. In the following, Grignard reagents obtained from the reaction between Mg turning and 4-chlorobutylferrocene, react with chlorodimethylsilane to form [4-(dimethylsilyl)butyl]ferrocene, which this compound undergoes a hydrosilylation reaction with hydroxyl terminated polybutadiene (HTPB) in the presence of hexachloroplatinic acid as the catalyst and butacene was synthesized as burning rate accelerator catalyst containing 8% of iron. FT-IR, 1H and 13C NMR analysis supported the predicted structure of the product. Also, iron percentage of the synthesized butacene was determined using 1H NMR spectrum..