Polyimide Precursor for Low Transmission Loss in High-Frequency Electronics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional polyimides fail to meet the demand for low transmission loss in high-frequency bands, which is essential for advanced electronic devices due to their higher signal frequency requirements.
Innovation Solution
A polyimide precursor with a specific structural unit, represented by formula (1), is developed, which includes a tetravalent group with aromatic rings and divalent groups from specific formulas (21) to (24), optimizing the structure to reduce the polarity of the main-chain and distribution density of imide rings, thereby lowering the relative dielectric constant and dielectric loss tangent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional polyimide is used, then heat resistance and mechanical properties are maintained, but transmission loss increases in high-frequency bands
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of polyimide precursors - specifically introducing aliphatic hydrocarbon groups (formulas 21-24) with controlled carbon atom counts (1-4) and substitution patterns. These structural parameter changes reduce the polarity and imide ring distribution density, directly lowering dielectric constant and loss tangent to achieve low transmission loss in high-frequency bands while maintaining heat resistance
Solution Approach 2:
The patent employs composite material principles by creating polyimide precursors that combine aromatic groups (for heat resistance) with aliphatic hydrocarbon groups (for low polarity). The divalent groups formulas (21-24) serve as composite structural units that integrate both functionality - the aromatic components provide thermal stability while the aliphatic components reduce dielectric properties, achieving a balance between heat resistance and low transmission loss
2Speed
If the frequency of signal transmission is increased, then data transmission speed is improved, but transmission loss increases
Solution Approach 1:
The patent addresses this contradiction by changing the dielectric parameters of the material - specifically reducing dielectric constant and loss tangent through structural modification of polyimide precursors. By controlling the carbon atom count (1-4) and substitution patterns in aliphatic hydrocarbon groups, the material parameters are optimized to enable high-frequency signal transmission with minimal loss, thus supporting high data transmission speeds
3Loss of energy
If the distribution density of imide rings is reduced, then dielectric loss tangent is lowered, but structural stability may be compromised
Solution Approach 1:
The patent resolves this contradiction through composite material design - combining aromatic groups (which provide structural stability) with aliphatic hydrocarbon groups (which reduce polarity and dielectric loss). The divalent groups formulas (21-24) create a composite structure where aromatic components maintain thermal and mechanical stability while aliphatic components lower dielectric loss tangent, achieving both objectives simultaneously
Solution Approach 2:
The patent applies local quality by creating regions with different functional characteristics within the polyimide structure. The aliphatic hydrocarbon groups (formulas 21-24) are strategically positioned to reduce polarity in specific regions, lowering dielectric loss tangent, while aromatic groups maintain structural stability in other regions. This localized functional differentiation allows simultaneous optimization of both properties
Data Source
AI summary
A polyimide precursor having a structural unit represented by the following formula (1):