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To address the problem of poor interfacial compatibility between polyimide (PI) and poly(vinylidene fluoride) (PVDF) during blending, a fluorinated copolyimide (FPI) was synthesized by introducing -CF3 groups into the PI main chain via copolymerization, and then FPI/PVDF all-organic composite films were prepared by blending FPI with PVDF. The chemical structure, micromorphology, thermal stability, and mechanical properties of the composite films were characterized, with a particular focus on their dielectric and energy storage performance at high temperature. The results show that after introducing -CF3 groups into the PI main chain, the interfacial gap between the FPI phase and PVDF phase is reduced to below 100 nm, and the conduction loss of the composite films is significantly suppressed at high temperature. The improved compatibility between PI and PVDF remarkably reduces the dielectric loss factor of the composite films at high temperature and enhances the frequency stability and temperature stability of the dielectric constant. When the mass fraction of PVDF is 5% and the molar fraction of 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) in FPI is 30%, the FPI/PVDF composite films achieve an electric strength of 515.30 kV/mm and a maximum energy storage density of 2.96 J/cm3 at 150℃, which is 85.0% higher than that of the PI/PVDF composite film with the same PVDF content but without fluorinated interfacial modification. Furthermore, the introduction of 6FDA and PVDF contributes to an increase in both the trap density and the deep trap energy level of the composite, thereby enhancing the high-temperature energy storage performance of the composite films.
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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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