Low Dielectric Constant Polyimide Hybrid Films Prepared by in Situ Blow-Balloon Method

Abstract

Insulating materials with a low dielectric constant and a low dielectric loss are in high demand to meet requirements of the continuous miniaturization of electronic devices and high speed information transmission. We fabricated porous polyimide/reduced graphene oxide (PI/rGO) hybrid films with an ultralow dielectric constant and a low dielectric loss via a facile “blow-balloon” method. Poly­(ethylene glycol) (PEG) was used as a pore-forming agent by mixing with polyamide acid carboxylate (PAAC) and GO in water. The ternary mixture of PAAC/GO/PEG formed a hydrogel and dried naturally into a xerogel film. Porous PI/rGO films were obtained by in situ thermal pyrolysis of PEG through heating PAAC/GO/PEG hybrid films to 400 °C. The homogeneous porous structure could be regulated easily by adjusting the mass ratio of PEG to PAAC/GO. The porous structure inside the hybrid films prepared by the hydrogel method provided the PI/rGO films with an ultralow dielectric constant (κ) as low as 1.9 and a high ductility with an average elongation at break above 38%. This porous PI/rGO film with an ultralow κ value may be a promising candidate for next-generation interlayer dielectrics.

Dielectric Properties of Fluorinated Aromatic Polyimide Films with Rigid Polymer Backbones

“…It is an effective way to reduce the dielectric constant of the polymer by decreasing the molar polarizability or increasing the molar volume of the molecules. Hence, the dielectric constants of polyimides could be reduced by introducing fluorine [ 5 , 6 , 7 , 8 ], aliphatic/alicyclic structure [ 9 , 10 , 11 ], large side groups [ 12 , 13 , 14 , 15 , 16 ] or air [ 17 , 18 , 19 , 20 ] into polymer backbones. Zhi et al [ 21 ] synthesized a series of semi-aromatic polyimide sheets, which were derived from the copolymerization of an alicyclic tetrahedral dianhydride (HBPDA) and an aromatic diamine mixture containing three flexible diamines.…”

Synthesis of various functionalized 2H‐azirines: An updated library

“…The heating of the azido cinnamates (readily prepared from the corresponding 2,6‐dichloro aldehyde and ethyl azidoacetate)in boiling toluene or xylene for 2.5 h gave the stable 2 H ‐azirine (Scheme 45) [65].…”

Construction of porous poly (aryl sulfide sulfone) film with low dielectric constant and excellent mechanical property

“…Zhang obtained controllable porous materials by introducing hydroxy‐Boc‐assisted modification and thermal foaming 1 . There are many ways to form pore structure, such as pyrolysis foaming method, 1,27 chemical dissolution method, 28–30 microemulsion method, 31–34 immersion precipitation phase transformation method, 2 and so on 35–41 . Although the pore structure is introduced, the mechanical property of the film is greatly damaged.…”