为了改善高能太根发射药的力学性能,在高能太根发射药配方的基础上,添加少量(质量分数0.5％,1.0％,1.5％,2.0％)由湿木浆纤维素得到的纳米纤维素纤维(CNFs),制备了含CNFs的高能太根发射药.采用扫描电镜、热重分析仪和差示扫描量热仪研究了添加CNFs前后高能太根发射药的表面结构和热分解性能.采用简支梁冲击试验机和密闭爆发器试验研究了含CNFs高能太根发射药的冲击强度及能量性能.结果表明,少量添加CNFs可明显提高高能太根发射药的低温冲击强度,对热分解性能影响很小.与高能太根发射药(参比样)相比,添加0.5％ CNFs的高能太根发射药,在-40℃低温和20℃室温下,冲击强度分别提高了30.4％和8.9％.随着CN Fs含量增加,火药力逐渐降低,余容逐渐上升,燃速逐渐减小,压力指数小幅度上升.当CNFs的添加量为0.5％时,高能太根发射药的火药力为1191.91 kJ· kg-1,余容为0.870 L·kg-1,压力指数为1.06,分别较参比样减少了1.9％、增加了5.1％和增加了4.2％.%To improve the mechanical properties of high-energy TEGDN gun propellants,based on high-energy TEGDN gun propellant formulations,addinga small amount (mass fraction of 0.5％,1.0％,1.5％,2.0％) of cellulose nanofibers (CNFs) obtained from lignocellulose,high-energy TEGDN gun propellants containing CNFs were prepared.The surface structure and thermal decomposition property of high-energy TEGDN gun propellants before and after adding CNFs were studied by scanning electron microscopy,thermogravimetric analyzer and differential scanning calorimeter.The impact strength and energy performance of high-energy TEGDN gun propellants containing CNFs were studied by the Charpy impact testing machine and closed bomb vessel test.The results show that adding a small amount of CNFs can obviously improve the low-temperature impact strength of high-energy TEGDN gun propellants and very little on thermal decomposition performance.Compared with the original high-energy TEGDN gun propellant (reference sample),the impact strength of high-energy TEGDN gun propellant of adding 0.5％ CNFs increases by 30.4％ under the low temperature of-40 ℃ and increases by 8.9％ under the room temperature of 20 ℃.With increasing the content of CNFs,the powder force decreases gradually,the covolume increases gradually,the burning rate decreases gradually,and the pressure exponent increases slightly.When the dosage of CNFs is 0.5％,the powder force,covolume and pressure exponent of high-energy TEGDN gun propellant are 1191.91 kJ · kg-1,0.870 L · kg-1 and 1.06,respectively,compared with the reference sample,they have a reduce of 1.9％,an increase of 5.1％ and an increase of 4.2％.respectively
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