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To solve the problem of poor thermal conductivity of polyimide (PI), PI was doped with hexagonal boron nitride (h-BN) modified by a surface wetting agent (F068) through in-situ polymerization, and then a series of h-BN/PI high thermal conductivity composites were prepared. The structure of h-BN/PI composites was characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. The thermal conductivity mechanism of h-BN/PI composites was explored by introducing the Y.Agari model, and the influence of modified h-BN filler doping content on the thermal conductivity, mechanical, heat resistance, and insulating properties of the composites was analyzed. The results show that with the increase of modified h-BN doping content, the thermal conductivity and thermal stability of h-BN/PI composites increase, while their tensile strength, elongation at break, and electric strength exhibit a significant downward trend. When the doping amount of modified h-BN is less than 30%, the influence of polymer crystal size factor on the thermal conductivity of the composites is dominant. When the doping amount of modified h-BN is higher than 30%, the influence of the free factor of the thermal chain formed by thermal conductive particles on the thermal conductivity of the composites is dominant. When the doping amount of modified h-BN is 50%, the thermal conductivity of h-BN/PI composite reaches 0.83 W/(m·K), the electric strength is 198.6 kV/mm, the 5% thermal decomposition temperature is 595℃, the tensile strength is 64.8 MPa, and the elongation at break is 10.4%.
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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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