期刊
ACS APPLIED POLYMER MATERIALS
卷 1, 期 8, 页码 2189-2196出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.9b00448
关键词
poly(ethylene glycol); blow-balloon method; polyimide; reduced graphene oxide; ultralow dielectric constant
资金
- Key Projects of the National Science Foundation of China [51173103]
- National Program on Key Basic Research Project [201403643605]
- Key Project of Science and Technology of Shanghai [16JC1403900]
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 degrees 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 (kappa) 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 kappa value may be a promising candidate for next-generation interlayer dielectrics.
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