Fluorinated Polyimide Optical Films for Transparency and Heat Resistance
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Solution Overview
Problem
Existing polyimides used in display devices face challenges in achieving excellent transparency and heat resistance while maintaining suitable film-forming properties, particularly when used as optical films or substrates.
Innovation Solution
A polyimide is synthesized by reacting an aromatic diamine with a tetracarboxylic dianhydride, incorporating a —C(CF3)H— group, which enhances solubility in organic solvents and improves film-forming properties, leading to improved transparency and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional polyimide is used to achieve heat resistance, then heat resistance is improved, but transparency deteriorates due to yellow-brown coloring
Solution Approach 1:
The patent changes the chemical structure parameters of polyimide by introducing fluorine-containing groups (hexafluoroisopropanol groups) and specific aromatic diamine structures. This chemical parameter modification inhibits charge transfer complex formation that causes yellow-brown coloring, thereby improving transparency while maintaining heat resistance through the fluorine-containing structure.
Solution Approach 2:
The patent creates a composite chemical structure by combining fluorine-containing polyimide with specific aromatic diamine compounds having hexafluoroisopropylidene groups. This composite approach integrates the heat resistance of polyimide with the transparency-enhancing properties of fluorine-containing and aromatic structures, achieving both heat resistance and transparency simultaneously.
2Illumination intensity
If fluorine is introduced into polyimide to improve transparency, then transparency is improved, but film forming properties deteriorate
Solution Approach 1:
The patent modifies the molecular weight and structural parameters of the polyimide by selecting specific aromatic diamine monomers with hexafluoroisopropylidene groups. This parameter optimization ensures the polyimide maintains appropriate viscosity and solubility characteristics for film formation while the fluorine-containing structure provides transparency.
Solution Approach 2:
The patent introduces fluorine-containing groups at specific locations within the polyimide chain structure rather than uniformly throughout. The hexafluoroisopropylidene groups are strategically positioned to inhibit charge transfer complexes at critical locations, improving transparency without excessively affecting the overall film-forming capability of the polyimide.
3Device complexity
If limited monomer types are used for polyimide synthesis, then manufacturing simplicity is maintained, but transparency and heat resistance performance deteriorate
Solution Approach 1:
The patent optimizes the chemical parameters of the monomer structure by using aromatic diamines with specific hexafluoroisopropylidene groups and controlling molecular weight ranges. This parameter optimization achieves excellent transparency and heat resistance performance using a focused set of monomer types, avoiding the need for excessive monomer diversity while maintaining high performance.
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 resulting polyimide exhibits enhanced transparency, heat resistance, and film-forming capabilities, making it suitable for use in optical films and display devices.
Implementation Method 1
a polyimide obtained by reacting an aromatic diamine having a 1,1,1-trifluoro-2,2-ethanediyl group with a tetracarboxylic dianhydride
Implementation Method 2
a polyimide obtained by reacting an aromatic diamine having a 1,1,1-trifluoro-2,2-ethanediyl group with a tetracarboxylic dianhydride is easily dissolved in an organic solvent
Data Source
AI summary
A polyimide which is obtained by a reaction of an aromatic diamine having a 1,1,1-trifluoro-2,2-ethanediyl group (—C(CF3)H—), as a linkage skeleton, with a tetracarboxylic dianhydride is easily dissolved in an organic solvent and exhibits excellent film forming properties. In addition, the thus-obtained polyimide can be used for an optical film and a display device.