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The crystallinity of chopped fibers has an important impact on the mechanical strength, thermal shrinkage resistance, toughness, and other properties of aramid paper. To investigate the influence and mechanism of chopped fibers crystallinity on the properties of meta-aramid paper, meta-aramid papers with different crystallinity of chopped fibers were prepared by controlled variable method, and their mechanical properties, electrical properties, and thermodynamic properties were tested. The results show that the electric strength of meta-aramid papers is not significantly affected by the crystallinity of chopped fibers, it is mainly determined by precipitated fibers. The tensile index of meta-aramid papers is almost not affected by the crystallinity of chopped fibers before hot-pressing, but increases with the increase of the crystallinity of chopped fibers after hot-pressing. When the crystallinity of chopped fibers increases from 27.19% to 47.91%, the tensile index of papers enhances from 46.2 N·m/g to 58.0 N·m/g. In addition, the thermal shrinkage resistance of papers is closely related to the crystallinity of chopped fibers. When the crystallinity of chopped fibers increases from 27.19% to 47.91%, the thermal shrinkage rate of papers decreases from 4.8% to 1.3%.
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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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