Polyimide Copolymer Crosslinking for Flexible Display Windows
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Solution Overview
Problem
Current portable display devices face challenges in finding a material for protective windows that simultaneously offers optimal mechanical and optical properties, as traditional glass is fragile and non-flexible, while plastic films struggle to meet these requirements.
Innovation Solution
A composition for preparing polyimide or poly(amide-imide) copolymers with improved mechanical properties through crosslinking via an amide bond, using carbodiimide or carbodiimidazole derivatives, maintaining good optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass is used as protective window material, then hardness and optical properties are satisfied, but flexibility and impact resistance deteriorate
Solution Approach 1:
The patent changes the material parameters by introducing crosslinked amide bonds into the polymer structure. This chemical modification transforms the polymer from a simple linear structure to a crosslinked network, fundamentally altering mechanical properties while maintaining optical characteristics, thereby resolving the contradiction between hardness and flexibility
Solution Approach 2:
The patent creates a composite polymer structure combining polyimide and polyamide segments in a single chain. This composite approach allows the material to exhibit both the thermal stability of polyimide and the enhanced mechanical properties of crosslinked polyamide, simultaneously achieving hardness and flexibility
2Adaptability or versatility
If plastic film is used as protective window material, then flexibility is improved, but mechanical properties such as hardness deteriorate
Solution Approach 1:
The patent applies parameter changes by introducing crosslinked amide bonds into the polymer structure. This chemical modification transforms the polymer from a simple linear structure to a crosslinked network, fundamentally altering mechanical properties while maintaining optical characteristics, thereby resolving the contradiction between hardness and flexibility
Solution Approach 2:
The patent creates a composite polymer structure combining polyimide and polyamide segments in a single chain. This composite approach allows the material to exhibit both the thermal stability of polyimide and the enhanced mechanical properties of crosslinked polyamide, simultaneously achieving hardness and flexibility
3Strength
If crosslinking is increased to improve mechanical properties, then tensile modulus and stress at break improve, but optical properties such as light transmittance may deteriorate
Solution Approach 1:
The patent applies local quality by positioning crosslinked amide bonds specifically within the polymer chain structure rather than adding random fillers or additives. This localized structural modification enhances mechanical properties through controlled crosslinking while maintaining the overall optical transparency of the polymer matrix, resolving the contradiction between tensile modulus and light transmittance
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 solution provides polyimide or poly(imide-amide) copolymers with enhanced mechanical properties such as tensile modulus and stress at break, while maintaining high light transmittance and thermal stability, suitable for use in flexible display devices.
Implementation Method 1
A composition for preparing polyimide or poly(amide-imide) copolymer, the composition including at least one of a polyamic acid and a poly(amic acid-amide) copolymer, and at least one of a carbodiimide derivative and a carbodiimidazole derivative
Data Source
AI summary
A composition for preparing at least one of a polyimide and a poly(imide -amide) copolymer, the composition including at least one of a polyamic acid and a poly(amic acid-amide) copolymer, and at least one of a carbodiimide derivative and a carbodiimidazole derivative.