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Preparation and properties of terphenyl-bridged and solution-processable polyimide films with reduced fluorine contents and low dielectric features
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Ruixuan WANG1, Lei XU2, Jijia LANG1, Xiaohan WANG3, Duanyi LI1, Zhenzhong WANG1, Xi REN1, Jingang LIU1, 4, *
Insulating Materials | 2026, 59(6) : 113 - 122
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Insulating Materials | 2026, 59(6): 113-122
Preparation and properties of terphenyl-bridged and solution-processable polyimide films with reduced fluorine contents and low dielectric features
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Ruixuan WANG1, Lei XU2, Jijia LANG1, Xiaohan WANG3, Duanyi LI1, Zhenzhong WANG1, Xi REN1, Jingang LIU1, 4, *
Affiliations
  • 1School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China
  • 2Hefei Sinopise Materials Co., Ltd., Hefei 231600, China
  • 3College of Material Engineering, North China Institute of Aerospace Engineering, Langfang 065000, China
  • 4Disan New Materials Research & Development (Sanhe) Co., Ltd., Langfang 065200, China
Published: 2026-06-20 doi: 10.16790/j.cnki.1009-9239.im.2026.06.011
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Two fluorine-containing polyimide (PI) resins, including PI-1(6FDA-BATFB) and PI-2(6HDA-BATFB) were prepared from two aromiatic dianhydrides 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and 4,4′-(isopropylidene)diphthalic anhydride (6HDA) and an aromatic diamine 1,4-bis[(4-amino-2-trifluoromethyl)phenyl]benzene (BATFB), respectively via two-step chemical imidization procedure. For comparison, two referenced PI resins, including PI-ref1 (6FDA-DMBZ) and PI-ref2 (6HDA-TFMB) were prepared using the dianhydrides 6FDA and 6HDA and the diamines 2,2′-dimethylbenzidine (DMBZ) and 2,2′-bis(trifluoromethyl)benzidine (TFMB) as the monomers, respectively. The corresponding PI films were prepared by the solution processing procedure. The testing results show that all the PI resins have good solubility not only in the polar aprotic solvents of N-methyl-2-pyrrolidone (NMP), N,N-dimethylacetamide (DMAc), and N,N-dimethylformamide (DMF), but in the common solvents of cyclopentanone (CPA) and tetrahydrofuran (THF). The incorporation of trifluoromethyls endow the PI-1 and PI-2 films good dielectric features. The dielectric constants (Dk) of PI-1 and PI-2 at 10 GHz are 2.97 and 3.01, respectively, and the dielectric dissipation factors (Df) of PI-1 and PI-2 are 0.007 7 and 0.006 3 for PI-2, respectively, which are superior to those of the referenced PI films. As for the thermal properties, the glass transition temperatures (Tg) of the terphenyl-bridged PI-1 and PI-2 films is over 309℃, and the linear coefficient of thermal expansion (CTE) value is lower than 50.0×10-6 K-1, which are a bit inferior to those of the referenced PI films. Meanwhile, the PI-1 and PI-2 films exhibit good optical transparency with the optical transmittance higher than 75% at the wavelength of 450 nm.

polyimide  /  low dielectric  /  terphenyl  /  trifluoromethyl  /  thermal properties
Ruixuan WANG, Lei XU, Jijia LANG, Xiaohan WANG, Duanyi LI, Zhenzhong WANG, Xi REN, Jingang LIU. Preparation and properties of terphenyl-bridged and solution-processable polyimide films with reduced fluorine contents and low dielectric features[J]. Insulating Materials, 2026 , 59 (6) : 113 -122 . DOI: 10.16790/j.cnki.1009-9239.im.2026.06.011
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Year 2026 volume 59 Issue 6
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doi: 10.16790/j.cnki.1009-9239.im.2026.06.011
  • Receive Date：2025-09-19
  • Online Date：2026-09-10
  • Published：2026-06-20
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  • Received：2025-09-19
  • Revised：2025-11-01
Affiliations
    1School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China
    2Hefei Sinopise Materials Co., Ltd., Hefei 231600, China
    3College of Material Engineering, North China Institute of Aerospace Engineering, Langfang 065000, China
    4Disan New Materials Research & Development (Sanhe) Co., Ltd., Langfang 065200, China
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表12种不同金属材料的力学参数
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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