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Bioinspired Hierarchically Porous Polyimide Films with Moisture-Resistant Low-κ Dielectric Performance.

Yingyi Ma1,2, Kexin Liu1, Yuhang Han1,3

  • 1School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, China.

ACS Applied Materials & Interfaces
|April 23, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method for creating porous polyimide films with low dielectric constants and excellent moisture resistance. This bioinspired approach uses water droplets and PEG to create hierarchical porosity, enhancing dielectric and mechanical properties for microelectronics.

Keywords:
bioinspired materialshierarchical porosityinterfacial polarizationlow-κ dielectricsmoisture resistancepolyimide films

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Dielectric Materials

Background:

  • Achieving polymer dielectric films with low dielectric constant, low moisture uptake, and high mechanical strength is crucial for microelectronics.
  • Existing materials often face trade-offs between these properties, limiting their application in advanced devices.

Purpose of the Study:

  • To develop a novel strategy for fabricating hierarchically porous polyimide (PI) films with enhanced dielectric and mechanical properties.
  • To create moisture-resistant, low-dielectric-constant (low-κ) films for interfacial dielectric layers.

Main Methods:

  • A bioinspired dual-template self-assembly strategy was employed.
  • Condensed water droplets served as microscale templates for honeycomb-like porous surfaces.
  • Poly(ethylene glycol) (PEG) acted as a nanoscale porogen for pore wall nanoporosity.

Main Results:

  • The optimized porous PI film achieved a low dielectric constant (κ = 2.3220) and low dielectric loss (0.00314).
  • Water uptake was significantly reduced to 0.483%, with minimal dielectric constant change (Δκ = 0.0630) under humid conditions.
  • Enhanced mechanical properties were observed, with tensile strength of 125.69 MPa and elongation at break of 64.48%.

Conclusions:

  • Hierarchically porous PI films fabricated via dual-template self-assembly offer a promising solution for moisture-stable, low-κ dielectric materials.
  • The strategy allows for tunable dielectric and mechanical properties by controlling porosity.
  • This approach provides a versatile platform for designing advanced polymer dielectrics for microelectronic and high-frequency applications.