Full
Outline
To address the application demands of aerospace engines for polyimide composite materials， the preparation and properties of polyimide-sized carbon fiber-reinforced polyimide composites are investigated. By utilizing triethylamine to saltify polyamic acid for water solubility， a water-based polyimide sizing agent is successfully developed. Carbon fiber is sized with polyimide sizing agent. A preparation process is established for waterborne polyimide-sized carbon fiber. The preparation and characterization are completed for polyimide composites reinforced with polyimide-sized carbon fiber. The composite shows good internal quality. Its interlaminar shear strength reaches 120 MPa， and the glass transition temperature is 426 ℃. The mass loss ratio is only 5.90% after thermal aging at 400 ℃ for 100 h. The composite exhibits excellent temperature resistance and interfacial performance.
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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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