Thermal nonequilibrium of the shock-compressed state of polymers realized by 1 GPa shock waves
Thermal nonequilibrium of the shock-compressed state of polymers realized by 1 GPa shock waves
复制标题
1 GPa冲击波实现聚合物冲击压缩状态的热非平衡
DOI：
10.1063/1.369032
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Y. Mori
中科院分区：
文献类型：
--
作者：
K. Nagayama;Y. Mori
本文提出了一种计算聚合物在1GPa压力范围内冲击温度的热力学理论。为此，Gruneisen参数已计算的基础上可用的非线性冲击速度粒子速度Hugoniot函数的聚合物。计算得到的大参数值对应于聚合物分子集体运动中的声子频率，而不是分子内振动频率。然后，平衡冲击温度以及冷势能函数计算使用计算的Gruneisen参数和可用的非线性激波速度-粒子速度Hugoniot函数。利用平衡热力学的Gruneisen参数和比热计算了冲击温度和冷势函数。从这些计算中，得到了下列非物理结果，即这些聚合物的冷势函数在零温度下没有极小值。
A thermodynamic theory has been developed to calculate the shock temperature of polymers in the 1 GPa pressure region. For this purpose, the Gruneisen parameter has been calculated based on the available nonlinear shock velocity–particle velocity Hugoniot function for polymers. The calculated large values of the parameter correspond to that of phonon frequencies in the collective motion of polymer molecules, and not to that of the intramolecular vibration frequencies. Then, the equilibrium shock temperature as well as the cold potential energy function is calculated using the calculated Gruneisen parameter and the available nonlinear shock velocity–particle velocity Hugoniot function. Shock temperature and cold potential function have also been calculated using the equilibrium thermodynamic values of the Gruneisen parameter and the specific heat. From these calculations, the following unphysical result has been derived; that is, the cold potential function for these polymers has no minimum value at zero-t...