Structural Designs of Transparent Polyimide Films with Low Dielectric Properties and Low Water Absorption: A Review

Area of Science:

• Materials Science
• Polymer Chemistry
• Electrical Engineering

Background:

• Rapid advancements in 5G and 6G communication networks necessitate materials for high-speed signal transmission.
• Existing materials often fall short of the required low dielectric constant (<2.5), low dielectric loss, and low water absorptivity.
• Polyimides (PIs) are promising due to their excellent properties and processability.

Purpose of the Study:

• To review structural designs of polyimides (PIs) for low dielectric constant (Dk) and dielectric loss (Df).
• To explore PIs with low water absorptivity and high optical transparency for communication applications.
• To establish structure-property relationships and propose modifications for optimal PI performance.

Main Methods:

• Literature review focusing on structural modifications of polyimides.
• Analysis of structure-property relationships concerning dielectric properties and water absorption.
• Characterization of various polyimide types for communication applications.

Main Results:

• Identified key structural features contributing to low dielectric constant and loss in PIs.
• Highlighted the importance of minimizing water absorption for stable dielectric performance.
• Demonstrated the potential of tailored PI structures for high-frequency signal transmission.

Conclusions:

• Specific structural designs are essential for developing advanced polyimides for next-generation communication networks.
• Optimizing PI structures can yield materials with low Dk, low Df, low water absorption, and high optical transparency.
• Further research into structure-property relationships will enable the creation of superior materials for broadband high-frequency applications.