Polycyclic Polyimides for Optical Displays
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Solution Overview
Problem
Conventional polyimides are not well-suited to replace glass or quartz in optical display devices due to insufficient glass transition temperature, light transmissibility, and coefficient of thermal expansion, making them unsuitable for applications like display screens or optical communication systems.
Innovation Solution
Development of polycyclic polyimides derived from cycloaliphatic diamine isomers, which can be represented by specific formulas, combined with tetracarboxylic dianhydrides to create polyimide resins, varnishes, or films with improved thermal and optical properties, including a range of isomeric structures and reaction processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional polyimides are used, then the material is easy to manufacture and process, but the glass transition temperature is insufficient and light transmissibility is poor
Solution Approach 1:
The patent modifies the chemical structure parameters of polyimides by introducing specific cycloaliphatic diamine isomers with controlled substitution patterns and molecular weights, achieving enhanced glass transition temperatures while maintaining manufacturability through established polyimide synthesis processes
Solution Approach 2:
The invention creates composite polyimide structures combining aromatic and aliphatic cyclic groups in specific ratios, where the aromatic components provide thermal stability and the aliphatic components contribute to light transmissibility, achieving both high glass transition temperature and optical clarity
2Illumination intensity
If conventional polyimides are used, then the material is easy to manufacture, but light transmissibility is insufficient for optical applications
Solution Approach 1:
The patent optimizes the molecular structure parameters by selecting specific cycloaliphatic diamine isomers with controlled chain lengths and substitution positions, reducing light scattering and absorption while maintaining ease of synthesis through conventional polyimide manufacturing methods
Solution Approach 2:
The invention introduces localized aromatic ring structures at specific positions within the polyimide chain to enhance light transmissibility in critical optical paths, while other regions maintain aliphatic structures for flexibility and ease of manufacture
3Stability of the object's composition
If conventional polyimides are used, then the material is easy to manufacture, but the coefficient of thermal expansion is unsuitable for glass substitution
Solution Approach 1:
The patent adjusts the chemical composition parameters by incorporating rigid aromatic cyclic groups in controlled proportions to reduce the coefficient of thermal expansion and match glass properties, while maintaining manufacturability through standard polyimide synthesis and processing techniques
4Reliability
If polycyclic polyimides with enhanced properties are developed, then glass transition temperature and light transmissibility improve, but the device complexity increases
Solution Approach 1:
The patent optimizes the molecular structure parameters by selecting specific cycloaliphatic diamine isomers with controlled substitution patterns and molecular weights, achieving enhanced glass transition temperatures and light transmissibility while managing structural complexity through systematic molecular design
Solution Approach 2:
The invention introduces localized functional groups and cyclic structures at specific positions within the polyimide chain to enhance thermal and optical performance in critical regions, while other regions maintain simpler structures to reduce overall molecular complexity and facilitate processing
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 polycyclic polyimides exhibit enhanced glass transition temperatures, light transmissibility, and thermal stability, making them viable substitutes for glass in electronic devices, particularly in display screens and optical communication applications.
Implementation Method 1
The polyimide (or polyamic acid precursor thereto) can be derived from the reaction product of a diamine component and dianhydride component
Data Source
AI summary
The present invention is directed to the use polycyclic diamines. These diamines, when polymerized with dianhydrides, and optionally other non-polycyclic diamines are used to form new polyamic acids. The polyamic acids can be imidized to form a new class of useful polyimide resins and polyimide films, particularly in electronics type applications.