Microporous Polyimide Sponge via Phase Inversion
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Solution Overview
Problem
Existing methods for producing polyimide sponges are inefficient and costly, particularly in large-scale production, and do not achieve optimal thermal and chemical resistance, mechanical properties, and uniform pore structure.
Innovation Solution
A method involving the reaction of aromatic dianhydrides with aromatic diamines in an organic polar solvent to create a polyamic acid precursor, which is then immersed in a liquid medium and cured in an oven, eliminating the need for vacuum solvent removal and enabling a continuous production process with improved thermal and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional methods using blowing agents or thermal decomposition are used to produce polyimide sponges, then sponge structure can be achieved, but chemical resistance and thermal stability are compromised
Solution Approach 1:
The patent employs phase inversion technique to create a porous sponge structure directly from the polyimide matrix without requiring blowing agents or porogens. The microporous network forms through controlled phase separation during solvent removal, achieving both the desired sponge morphology and preservation of the polyimide's inherent chemical resistance and thermal stability
Solution Approach 2:
The patent controls the phase inversion process by adjusting parameters such as solvent type, non-solvent composition, and drying conditions to achieve uniform microporous structure. This allows optimization of pore size and distribution while maintaining the integrity and stability of the polyimide material
2Productivity
If batch processing is used for polyimide sponge production, then small-scale production is feasible, but productivity and scalability are limited
Solution Approach 1:
The patent describes a continuous processing method where polyimide solution is cast onto moving belts, subjected to phase inversion, and dried in a continuous manner. This eliminates the need for batch processing steps, significantly increasing production efficiency and enabling large-scale manufacturing while maintaining process control through standardized parameters
3Loss of time
If vacuum solvent removal is used in the production process, then solvent can be effectively removed, but production time and energy consumption increase
Solution Approach 1:
The patent utilizes phase inversion where the addition of non-solvent causes the polyimide solution to undergo phase separation, precipitating the polymer and releasing solvent rapidly. This phase transition-driven solvent removal occurs spontaneously during the phase inversion step, eliminating or reducing the need for energy-intensive vacuum drying processes
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 method produces a high-functional microporous polyimide sponge with enhanced chemical resistance, thermal insulation, and mechanical properties, suitable for applications such as thermal insulation, drug delivery, and catalyst supports, with improved scalability and cost-effectiveness.
Implementation Method 1
wet phase inversion methods using soluble polyimides are applied to the production of polymer films
Implementation Method 2
the thermal decomposition of less heat resistant polymers after mixing with more heat resistant polymers
Data Source
AI summary
Disclosed is a net-shaped polyimide sponge. The polyimide sponge has a stack structure of nets. Also disclosed is a method for producing a polyimide sponge. The method enables the production of a polyimide sponge in a continuous process, which offers advantages for large-scale production compared to conventional methods using batch systems.