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Polyimide Films Based on β-Cyclodextrin Polyrotaxane with Low Dielectric and Excellent Comprehensive Performance
Xuexin Zhang1, Yao Dou1,2, Liqun Liu1
1State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China.
Polymers
|April 13, 2024
Summary
Researchers developed a novel polyimide (PI) film by integrating β-cyclodextrin and trifluoromethyl groups. This fluorine-containing PI film achieves a low dielectric constant of 2.55, excellent thermal stability, and high optical transparency.
Area of Science:
- Polymer Science
- Materials Science
- Dielectric Materials
Background:
- Polyimide (PI) films are crucial for electronic applications but often require enhanced properties.
- Achieving low dielectric constants alongside excellent thermal and mechanical performance remains a challenge.
- Fluorine-containing polyimides offer potential for improved dielectric properties.
Purpose of the Study:
- To synthesize a semi-aromatic fluorine-containing polyimide ternary system incorporating β-cyclodextrin.
- To achieve a low dielectric constant (low-k) and excellent comprehensive performance in polyimide films.
- To explore potential applications in advanced electronic packaging and flexible displays.
Main Methods:
- A two-step synthesis method was employed to integrate β-cyclodextrin into the polyimide matrix.
- Trifluoromethyl groups were introduced to reduce the dielectric constant.
- Characterization of dielectric properties, thermal stability, mechanical strength, and optical transparency.
Main Results:
- The resulting polyimide film exhibited a significantly reduced dielectric constant of 2.55 at 10 MHz.
- Exceptional thermal stability with a glass transition temperature exceeding 300 °C was observed.
- High optical transparency (89% transmittance at 450 nm), a strength of 122 MPa, and a modulus of 2.2 GPa were achieved.
- The combination of colorless polyimide (CPI) transparency and stretchability contributed to the low dielectric constant.
Conclusions:
- The developed polyimide film demonstrates a promising combination of low dielectric constant, high thermal stability, mechanical robustness, and optical transparency.
- The strategic integration of β-cyclodextrin and trifluoromethyl groups offers a viable pathway for advanced electroactive polymers.
- Potential applications include flexible displays, circuit printing, and chip packaging, benefiting from the material's unique properties.
