Full
Outline
According to time-temperature superposition, it is shown that at certain frequency, the higher temperature the lower modulus. At a certain temperature, the lower frequency the lower modulus, which indicates that elevated temperature and reduced frequency has the equivalent effects. Based on this, the mechanical properties of rubber materials at wide frequency can be obtained by the data in different temperatures. For studying the basic theory of the damping properties of rubber, a modified Williams-Lendel-Ferry (WLF) equation under pressure has been proposed in this work. According to the loss factor tan δ from DMTA experiments, the shift factors under different pressures might be calculated. Then, the mast curve of loss factor versus frequency could be plotted, in which the range of frequency spanned about ten orders of magnitude. The result showed that the peak of tan δ appeared below the reference temperature. With the increasing pressure, the glass transition temperature moved towards higher frequency, and enhenced by 1.5 orders of magnitude. This method offered the theoretical basis to quantitatively characterize the damping properties of rubber materials.
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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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