Full
Outline
Polymers are widely used in various fields of national defense and national economy. They are inevitably exposed to extreme conditions of high temperature and high pressure during applying. Thus, it is necessary to study their physical properties and “phase transition” under impact loading. Because of their characteristic molecular chain structure, polymers show different properties from most materials such as metals. The intercept extrapolated from Hugoniot curve at low pressure is obviously higher than their body sound velocity at atmospheric pressure. The wave profile at low pressure presents a structure with an arc shape. At 20–30 GPa, the Hugoniot line turns obviously, indicating that the material has undergone a “phase transition” under impact loading. The “phase transition” is explained as chemical decomposition or lattice structure transformation, and the kinetics of “phase transition” is studied. In addition, the modeling method of equation of state based on chemical decomposition is briefly introduced. Finally, the prospect is put forward according to the doubtful points in the study of physical properties and “phase transition” of polymers under impact loading.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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