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为研究硝化纤维素(NC)/硝化甘油(NG)共混体系力学状态的温度依赖特性,采用动态力学性能实验和分子动力学模拟研究了温度对其宏微观力学状态的影响。结果表明,NC/NG共混体系的力学状态与NC分子链在不同温度下的运动状态密切相关,主要取决于链段运动需要的自由体积、热运动能力及其与NG分子间的作用力。NC/NG共混体系的两个力学松弛过程分别与自由体积的不连续变化和NC分子链链段运动的突然增强有关。
In order to study the temperature dependence of the mechanics state of the nitrocellulose (NC) / nitroglycerin (NG) blends, the influence of temperature on the macroscopical and microcosmic mechanical properties was investigated by dynamic mechanical behavior experiments and molecular dynamics simulations. The results show that the mechanical state of NC / NG blends is closely related to the kinematic state of NC molecular chains at different temperatures, which is mainly determined by the free volume, thermal kinetic capacity and the interaction between NG and NC molecules. The two mechanical relaxation processes of NC / NG blends are respectively related to the discontinuous change of free volume and the abrupt increase of NC molecular chain segment motion.