标题：Fullerene bisadduct stabilizers: The effect of different addition positions on inhibiting the autocatalytic decomposition of nitrocellulose absorbed nitroglycerin
摘要：AbstractTo explore the effect of different positions and number of pyrrolidine bound to the carbon cage on the stabilization effect of fulleropyrrolidine derivatives to nitrocellulose (NC)/nitroglycerine (NG), we synthesizedN-(4-methoxy) phenylpyrrolidine-C60and four different of bis(N-(4-methoxy) phenylpyrrolidine)-C60compounds through Prato reaction. Their structures were characterized by UV–vis,1H NMR,13C NMR, high-resolution mass spectroscopy, and single-crystal X-ray diffraction. Their stabilization effect to NC/NG were investigated using differential scanning calorimetry, methyl violet, vacuum stabilization effect, weight loss, and accelerating rate calorimeter tests. The results indicated these compounds had excellent stabilization effect to NC/NG. The stabilization effect of the fulleropyrrolidine bisadducts to NC/NG is significantly better than that of fulleropyrrolidine monoadduct and C60. Moreover, the position where pyrrolidine binds to fullerene in fulleropyrrolidine bisadducts is different, and its stabilization effect to NC is also different. The stabilization effect order of different bisadduct isomers to nitrocellulose is as follows: e-edge > trans-2> cis-2> trans-3. Electron paramagnetic resonance (EPR) and FT-IR were used to study the stabilization mechanism of fulleropyrrolidine derivatives to NC/NG. The EPR results also show that fulleropyrrolidine bisadducts with different addition sites have different abilities to absorb nitroxide, and their ability is better than that of the monoadduct and C60, which is consistent with the results of stabilization effect performance test.Graphical abstractThe figure describes the stabilization mechanism of fulleropyrrolidine derivatives as stabilizers. Fulleropyrrolidine derivatives absorbed nitrogen oxides produced by NC/NG system in time, and this process substantially weakened the autocatalytic decomposition of NC/NG. In addition, the nitroxide radicals produced by the decomposition of NC/NG were absorbed quickly by fulleropyrrolidine derivatives, thus prolonging the safe storage life of NC/NG.Display OmittedHighlights•Four bis(N-(4-methoxy) phenylpyrrolidine)-C60isomers were synthesized.•It is proved that the different addition position of group on carbon cage leads to different stability of stabilizer.•It is proved that the different addition quantity of group on carbon cage leads to different stability of stabilizer.•The results showed that fullerene pyrrolidine derivatives could inhibit the Autocatalytic Decomposition of NC/NG.
