硝化纤维素/硝化甘油共混体系力学状态的温度依赖特性

Temperature Dependence of Mechanical State for

关键词:  物理化学  硝化纤维素  硝化甘油  力学状态  温度

Key words:  Physical chemistry  Nitrocellulose  Nitroglycerine  Mechanical state  Temperature

摘要:

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。

Abstract:

In order to study the temperature dependence of mechanical state for nitrocellulose (NC)/nitroglycerin (NG) blend，the effects of temperature on the macro and micro mechanical properties of NC/NG blend were investigated by means of dynamic mechanical analyzer and molecular dynamics simulation. It has been indicated that the mechanical states of NC/NG blend are correlated with the motion states of NC molecular chains at different temperature. The latter is basically determined by the free volume，the capacity of their thermal motion，as well as the interaction force with NG molecules. It has been found that there are two mechanical relaxation processes，which are caused by the discontinuous nature of free volume and a sudden increase of rotary motion inside NC molecules，respectively.