Density Functional Theory-Based Approach For Dielectric Constant Estimation of Soluble Polyimide Insulators

Area of Science:

• Materials Science
• Computational Chemistry
• Polymer Science

Background:

• Dielectric properties of polymers are critical for electronic devices like field-effect transistors and wireless communication.
• Soluble polyimides (SPIs) are promising materials, but understanding their dielectric behavior is essential for optimization.

Purpose of the Study:

• To utilize density functional theory (DFT) for predicting the dielectric constant of synthesized soluble polyimides (SPIs).
• To establish a correlation between the molecular structure of SPIs and their dielectric properties.
• To offer a cost-effective and accelerated method for evaluating polymer insulators.

Main Methods:

• Synthesis of various SPIs with trifluoromethyl groups, varying pendant types, numbers, and symmetries.
• Application of DFT to estimate the static dielectric constant using single-chain and stacked-chain models.
• Experimental evaluation of dielectric constants for synthesized SPIs.
• Analysis of ionic and electronic contributions to the dielectric constant.

Main Results:

• Successful synthesis and characterization of diverse SPIs.
• DFT-estimated dielectric constants showed high accuracy (≥80%) compared to experimental values for the single-chain model.
• Established relationships between molecular structure and dielectric performance.

Conclusions:

• DFT provides a reliable and efficient approach for predicting the dielectric constant of SPIs.
• The developed methodology accelerates the discovery and design of novel polymer insulators for advanced electronic applications.
• This study offers a rational strategy for material selection in electronic device development.