Polyimide Precursor Composition with Terminal Triple Bond
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Solution Overview
Problem
Polyimide precursor compositions with terminal carboxy or amide groups in aqueous solvents experience increased viscosity over time, leading to deteriorated storage stability and film preparation properties.
Innovation Solution
Incorporating a polyimide precursor with a terminal triple bond group in an aqueous solvent composition, which enhances solubility and prevents viscosity increase, allowing for improved storage stability and mechanical characteristics of the polyimide molded articles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polyimide precursor with terminal carboxy or amide groups is used in an aqueous solvent, then the polyimide molded article achieves good mechanical characteristics, but the viscosity of the composition increases over time leading to deteriorated storage stability
Solution Approach 1:
The invention changes the chemical parameter of the polyimide precursor by replacing terminal carboxy or amide groups with terminal triple bond groups. This parameter change fundamentally alters the molecular structure to prevent the time-dependent viscosity increase while preserving mechanical characteristics. The triple bond group creates a different chemical environment at the polymer chain end that does not promote aggregation or crosslinking over time.
Solution Approach 2:
The invention creates a composite chemical structure by combining the polyimide backbone with terminal triple bond groups. This composite approach integrates the desirable mechanical properties of polyimide with the stabilizing effect of the triple bond terminal group, achieving both strength and storage stability in the composition.
2Strength
If a polyimide precursor with terminal carboxy or amide groups is used in an aqueous solvent, then the polyimide molded article achieves good mechanical characteristics, but the film preparation properties deteriorate due to increased viscosity
Solution Approach 1:
By changing the terminal group parameter from carboxy/amide to triple bond, the invention maintains low viscosity over time, which directly preserves film preparation properties. The triple bond terminal structure prevents the compositional changes that would otherwise occur with storage, ensuring consistent coating and molding performance.
3Strength
If a polyimide precursor with terminal carboxy or amide groups is used, then the polyimide resin achieves good mechanical characteristics, but the solubility in aqueous solvent decreases leading to viscosity increase
Solution Approach 1:
The invention changes the solubility parameter by introducing terminal triple bond groups, which create a molecular structure that remains soluble in aqueous solvents without the time-dependent aggregation that occurs with carboxy or amide terminal groups. This parameter change maintains both solubility and mechanical characteristics.
Data Source
AI summary
A polyimide precursor composition includes a solvent including water and a polyimide precursor including a group having a triple bond at a terminal thereof, which is dissolved in the solvent.