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An aramid 1313 fibrid was prepared by precipitation method, and its morphology structure and properties were characterized by fiber length test, thermogravimetric analysis (TGA), X-Ray diffraction (XRD), scanning electrical microscopy (SEM). The dewaterability of aramid 1313 fibrids and chopped fibers in the papermaking process was evaluated by dewatering time, and the mechanical properties and electrical insulation properties of the paper were studied. The results show that with the increase of molecular weight of aramid 1313 fibrid, the average length of fibrids increases, and the tensile strength, elongation at break, tearability, and insulating properties of the paper increase. The fibrid is non-crystalline structure. With the increase of molecular weight, it becomes to film structure, and the thermostability increases. However, the thermostability of chopped meta-aramid fiber is still higher than that of aramid 1313 fibrids.
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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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