Modified Polyimide Thin Film for Transparent Flexible Displays
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Solution Overview
Problem
Traditional polyimide films used in flexible display technology are brown due to charge transfer complexes, limiting their application in transparent flexible displays.
Innovation Solution
Copolymerization of aliphatic dianhydride with 4-(10-Methylundecyl)benzenesulfonic acid to create a modified polyimide thin film, which reduces charge transfer complex formation, enhancing transparency and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional polyimide film is used, then heat resistance and mechanical properties are excellent, but the film is brown due to charge transfer complex spectral absorption, limiting transparency application
Solution Approach 1:
The patent modifies the chemical structure of polyimide by changing the dianhydride component from aromatic to aliphatic (cyclic structure), which fundamentally alters the electronic properties of the molecule. This structural parameter change eliminates the charge transfer complex formation between dianhydride and diamine residues, thereby removing the brown color and enabling high visible light transmittance while preserving heat resistance
Solution Approach 2:
The patent creates a composite polyimide structure by copolymerizing aliphatic dianhydride (CBDA or CHDA) with specific diamine monomers containing electron-donating groups. This composite approach combines the flexibility and transparency benefits of aliphatic structures with the thermal stability of polyimide, achieving a material that simultaneously provides colorlessness, flexibility, and heat resistance
2Adaptability or versatility
If aliphatic dianhydride is copolymerized to improve transparency and flexibility, then visible light transmittance and flexibility are enhanced, but heat resistance must be maintained
Solution Approach 1:
The patent achieves flexibility by changing the dianhydride structure from rigid aromatic to flexible aliphatic cyclic structures (CBDA or CHDA). The aliphatic cyclic structure provides chain flexibility while the cyclic nature maintains structural integrity and thermal stability, enabling the film to be both flexible and heat-resistant simultaneously
3Illumination intensity
If copolymerization is performed to eliminate charge transfer complex, then colorlessness is achieved, but manufacturing process complexity increases
Solution Approach 1:
The patent achieves colorlessness through a straightforward parameter change in the polymerization reaction: using aliphatic dianhydride (CBDA or CHDA) instead of traditional aromatic dianhydride with conventional diamine. This single parameter change in monomer selection eliminates charge transfer complex formation and brown coloration, while the copolymerization process itself is a standard polymerization technique without additional manufacturing complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The modified polyimide thin film achieves improved flexibility, colorlessness, and visible light transmittance while maintaining excellent heat resistance, making it suitable for transparent flexible display technology.
Implementation Method 1
the aliphatic dianhydride monomer is copolymerized with the 4-(10-Methylundecyl)benzenesulfonic acid monomer to prepare a modified polyimide thin film
Implementation Method 2
baking the reaction solution in a vacuum atmosphere at 50 to 120 Celsius degrees to form a film
Implementation Method 3
heating and curing the film obtained in Step 2 starting from 80 to 120 Celsius degrees
Data Source
AI summary
Disclosed are a modified polyimide thin film and a manufacturing method thereof applied for colorless transparent flexible display technology. A material of the modified polyimide thin film has a following structural formula:whereinis selected from one of—R2- is selected from one of —O—,n is a degree of polymerization and n is a natural number. The obtained film possesses good heat resistance, excellent colorlessness and flexibility.