高能固体填充硝化纤维素材料的动态贮能模量

THE DYNAMIC STORAGE MODULUS OF ENERGETIC MATERIALS BULK OF NITROCELLULOSE FILLED BY HIGH ENERGY SOLID

用 DDV- - EA型动态粘弹谱仪对黑索金 ( RDX)和硝基胍 ( NGU)填充的硝化纤维素基含能材料的动态贮能模量进行了研究。发现动态贮能模量明显地受到温度和频率的影响 ,温度升高 ,动态贮能模量降低 ;频率升高 ,动态贮能模量增加 ,温度和频率的影响规律可以认为是由于 RDX或 NGU的加入 ,使基体硝化纤维素的变形能力或分子运动状况受到了限制。老化以后 ,两种硝化纤维素基含能材料的动态贮能模量随老化时间的增加而上升 ,但上升的规律不同。 RDX填充的硝化纤维素基含能材料的动态贮能模量随老化时间的增加呈直线规律上升 ,NGU填充的硝化纤维素基含能材料则近似以对数曲线的规律上升 ,且存在明显的临界老化时间 ,约为 40 0 h,在相同条件下 ,NGU填充的硝化纤维素基含能材料的动态贮能模量大于 RDX填充的硝化纤维素基含能材料 ,即前者的动态断裂韧性小于后者。

The dynamic storage modulus of energetic materials bulk of nitrocellulose filled by RDX and NGU was investigated. Results show that the dynamic storage modulus is influenced by temperature and frequency obviously, the dynamic storage modulus decreased when temperature increased, and raised when frequency grew, this is due to the deformed ability and molecular movement of bulk nitrocellulose are restricted by adding the RDX and NGU. The dynamic storage modulus of two kinds of energetic materials bulk of nitrocellulose, after aging, increase with the extending of aging time according to different increasing laws, the dynamic storage modulus of energetic material bulk of nitrocellulose filled by RDX rises by linear regulation, the energetic material bulk of nitrocellulose filled by NGU by logarithm regulation approximately, the latter has critical aging time, about 400 h. The dynamic storage modulus of energetic material bulk of nitrocellulose filled by NGU, at the same condition, is greater than that of filled by RDX, in other words, the dynamic fracture toughness of the former is less than that of the latter.