Polyimide Precursor Composition Storage Stability
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Solution Overview
Problem
Polyimide precursor compositions face challenges in maintaining storage stability and imidization efficiency, particularly due to the volatility of cyclic amine compounds and the presence of aprotic polar solvents, which affect the mechanical strength and insulating properties of polyimide molded articles.
Innovation Solution
A polyimide precursor composition is developed with a resin having a repeating unit represented by Formula (I) and an imidization ratio of 0.2 or less, combined with cyclic and acyclic amine compounds dissolved in an aqueous solvent, which promotes imidization and enhances storage stability, mechanical strength, and reduces the presence of aprotic polar solvents to prevent damage to polymer chains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cyclic amine compounds are used to promote imidization, then imidization efficiency is improved, but storage stability deteriorates due to volatility
Solution Approach 1:
The patent introduces a water-soluble polymer as an intermediary carrier to dissolve cyclic amine compounds. This mediator enables the cyclic amine to promote imidization effectively while the polymer matrix prevents direct volatility, thereby resolving the contradiction between imidization efficiency and storage stability.
Solution Approach 2:
The invention creates a composite system where cyclic amine compounds are combined with water-soluble polymers to form a precursor composition. This composite structure allows the cyclic amine to function as an imidization catalyst while the polymer provides structural stability and prevents volatilization, simultaneously achieving both improved imidization efficiency and storage stability.
2Ease of operation
If aprotic polar solvents are used to dissolve polyimide precursors, then solubility is improved, but mechanical strength and insulating properties deteriorate
Solution Approach 1:
The patent removes aprotic polar solvents from the composition entirely and replaces them with water as the solvent. This extraction of the harmful solvent component eliminates the degradation of mechanical strength and insulating properties while maintaining solubility through the use of water-soluble polymers and amine compounds.
Solution Approach 2:
The invention changes the solvent parameter from aprotic polar solvents to water, fundamentally altering the composition's chemical environment. This parameter change enables the polyimide precursor to maintain solubility through alternative mechanisms (water-soluble polymers and amine complexes) while avoiding the harmful effects on mechanical and electrical properties.
3Reliability
If imidization ratio is increased to improve performance, then electrical properties are improved, but voids and odor issues increase
Solution Approach 1:
The patent incorporates cyclic amine compounds in the precursor composition that act as preliminary imidization catalysts. These compounds initiate imidization during the heating process, enabling complete imidization at lower temperatures and shorter times, thereby achieving high electrical properties while minimizing void formation and odor generation.
Solution Approach 2:
The invention changes the imidization process parameters by using cyclic amine catalysts that enable low-temperature, short-duration imidization. This parameter change achieves complete imidization (high electrical properties) without the prolonged high-temperature exposure that causes voids and odor, thus resolving the contradiction.
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 achieves improved storage stability, mechanical strength, and electrical properties of polyimide molded articles, while minimizing voids and odor issues, and maintaining high film-forming properties and environmental compatibility.
Implementation Method 1
a resin having a repeating unit represented by the following Formula (I) and having an imidization ratio equal to or less than 0.2, a cyclic amine compound, and an acyclic aliphatic amine compound
Data Source
AI summary
A polyimide precursor composition includes a resin having a repeating unit represented by the following Formula (I) and having an imidization ratio equal to or less than 0.2, a cyclic amine compound, and an acyclic aliphatic amine compound, wherein the resin, the cyclic amine compound, and the acyclic aliphatic amine compound are dissolved in an aqueous solvent:wherein in Formula (I), A represents a tetravalent organic group and B represents a divalent organic group.