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A quartz reinforced polyimide resin composite with high wave-transmitting and low thermal conductivity was prepared by the autoclave molding process using a fluorine-containing polyimide resin as resin matrix and quartz fiber cloth as reinforcement. At first, the curing behavior of fluorine-containing polyimide was preliminarily determined by DSC and viscosity-temperature curve. Then the optimal curing process parameters was determined by studying the influences of different curing process parameters on the mechanical properties of the composites. At last, the thermal conductivity, dielectric properties, and wave-transmitting properties in a wide frequency range of the composites were investigated. The results show that during the molding process of polyimide composite, the optimal molding temperature is 300℃, the molding pressure is no less than 1.0 MPa, and the curing temperature is 370-390℃. The polyimide composite prepared according to the optimal molding process parameter has 0.57 W/(m·K) of thermal conductivity in the range of 25-450℃ and excellent dielectric performance in the range of 7-18 GHz, and its transmittance is more than 83%, which meets the application requirements of wave-transmitting functional 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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