Polyimide Composition with Amino-Modified Inorganic Particles for Room Temperature Stability
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Solution Overview
Problem
Current polyimide compositions face challenges in maintaining storage stability and viscosity control, leading to issues in coating processes for optical devices, as they either gel quickly or require refrigeration, and lack mechanical and chemical stability.
Innovation Solution
A composition comprising an oligomer with dicarboxylic acid terminals and inorganic particles with surface-modified amino groups, which allows for crosslinking and improved mechanical and chemical properties, enabling stable storage at room temperature and suitable viscosity for spin coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional polyimide compositions are used, then coating process can be performed, but the composition gels quickly and requires refrigeration, leading to poor storage stability
Solution Approach 1:
The patent uses a specific oligomer composition as an intermediary substance that mediates between the need for storage stability and coating processability. The oligomer with controlled molecular weight and functional groups acts as a intermediate state material that prevents premature gelation while enabling subsequent curing, resolving the contradiction between stable storage and ease of coating operation
Solution Approach 2:
The patent applies parameter changes by precisely controlling the oligomer's molecular weight, functional group concentration, and composition ratios. These parameter adjustments allow the composition to maintain stable viscosity during storage while remaining processable for coating, and subsequently cure to form the final polyimide structure, thus resolving the storage stability versus operability contradiction
2Stability of the object's composition
If refrigeration is used to prevent gelation, then storage stability is improved, but mechanical and chemical stability deteriorates
Solution Approach 1:
The patent converts the potentially harmful effect of room temperature storage (which would cause gelation) into a benefit by using the controlled oligomer composition that remains stable at room temperature. The specific molecular structure and functional group arrangement transform what would be a harmful condition into a favorable storage environment, eliminating the need for refrigeration while maintaining both gelation prevention and material stability
Solution Approach 2:
The patent employs a composite oligomer system combining multiple functional groups and molecular weight components in specific ratios. This composite structure provides synergistic effects where the combination of components delivers both room temperature storage stability and mechanical/chemical reliability, resolving the contradiction between gelation prevention and material stability that cannot be achieved with single-component systems
3Ease of operation
If viscosity is reduced for spin coating, then coating processability is improved, but storage stability deteriorates
Solution Approach 1:
The patent applies dynamics by creating a composition whose viscosity characteristics are optimized for the specific spin coating process conditions. The oligomer formulation provides appropriate viscosity at coating temperature and speed, while the molecular structure ensures viscosity stability during storage, dynamically adapting to processing conditions without compromising storage properties
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 composition maintains stable viscosity for extended periods at room temperature, preventing gelation and enabling the production of polyimide films with enhanced mechanical and chemical properties, suitable for optical devices with improved transparency and thermal stability.
Implementation Method 1
an oligomer comprising at least two termini, wherein the oligomer is selected from a polyimide, a polyamic acid, a poly(imide-amic acid), or a combination thereof, and at least two of the at least two termini of the oligomer include a dicarboxylic acid group; and an inorganic particle comprising a surface, wherein the surface includes two or more amino groups
Data Source
AI summary
A composition for preparing a polyimide including an oligomer including at least two termini, wherein the oligomer is selected from a polyimide, a polyamic acid, a poly(imide-amic acid), and a combination thereof, and wherein at least two of the at least two termini of the oligomer include a dicarboxylic acid group; and an inorganic particle having a surface, wherein the surface comprises two or more amino groups.