Polyamic Acid Salt Resin for High-Temperature Polyimide 3D Printing
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Solution Overview
Problem
Current additive manufacturing methods face challenges in processing high-temperature polyimides and polybenzoxazoles due to their thermal resistance, which limits the complexity and resolution of 3D printed products, and requires unique synthetic and manufacturing strategies to overcome solubility and processing barriers without compromising molecular architecture.
Innovation Solution
Development of polymer resins for vat photopolymerization using polyamic acid salts with photocrosslinkable counter ions and photoinitiators, allowing for the creation of complex 3D structures through stereolithography by initiating crosslinking with light exposure, followed by thermal imidization to form high-temperature polyimides and polybenzoxazoles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional melt processing is used for high-temperature polyimides, then processing is enabled, but the thermal resistance of these polymers makes processing essentially impossible
Solution Approach 1:
The patent changes the processing parameters by using solution processing instead of melt processing. The polyimide is dissolved in a solvent to create a processable solution, which is then applied and cured to form the final product. This avoids the need to heat the polymer above its glass transition temperature, thereby overcoming the thermal resistance barrier while maintaining processability.
Solution Approach 2:
The patent introduces a solvent as an intermediary substance to enable processing. The solvent allows the polyimide to be handled in a dissolved state at lower temperatures, acting as a mediator between the insoluble polyimide and the processing equipment. After application, the solvent is removed through drying or curing, leaving the final polyimide product.
2Ease of manufacture
If soluble precursors with photo-curable groups are used for 3D printing, then additive manufacturing is enabled, but the precursors must be converted to final polyimide through post-processing
Solution Approach 1:
The patent merges multiple functions into a single material system. The precursor polymer simultaneously provides solubility for processing, photo-curability for additive manufacturing, and convertibility to the final polyimide structure. This consolidation eliminates the need for separate processing steps and integrates multiple transformations into a unified manufacturing flow.
Solution Approach 2:
The patent performs preliminary actions by pre-installing photo-curable functional groups into the precursor polymer structure before printing. This preliminary functionalization enables the material to undergo in-situ crosslinking and conversion during or after printing, eliminating the need for separate post-processing steps to add these functionalities.
3Temperature
If all-aromatic molecular structure is used, then thermal stability is achieved, but melt processing becomes impossible
Solution Approach 1:
The patent changes the processing parameter from temperature-based melt processing to solvent-based solution processing. By using a solvent to dissolve the polyimide at lower temperatures, the material can be processed without requiring temperatures above its glass transition point, thereby maintaining thermal stability while enabling manufacturing.
Solution Approach 2:
The patent replaces the mechanical melt processing system with a chemical solution processing system. Instead of using heat and mechanical force to process the polymer, the patent uses chemical dissolution in a solvent, followed by controlled precipitation or curing, thereby avoiding the thermal and mechanical demands of conventional melt processing.
4Productivity
If conventional fabrication techniques are used for polyimides, then production is enabled, but geometry is restricted to films only
Solution Approach 1:
The patent replaces conventional mechanical fabrication techniques (such as extrusion or molding) with additive manufacturing using stereolithography. This substitution enables the creation of complex three-dimensional geometries that cannot be achieved with traditional film-based or molded processes, while maintaining production capability through automated layer-by-layer construction.
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
Enables the production of high-temperature polyimides and polybenzoxazoles with exceptional thermal stability and mechanical properties, overcoming previous limitations in complexity and resolution of 3D printed products.
Implementation Method 1
stereolithography by initiating crosslinking with light exposure
Implementation Method 2
followed by thermal imidization to form high-temperature polyimides and polybenzoxazoles
Data Source
AI summary
In various aspects, a polymer resin is provided for vat photopolymerization. The resin can include a polyamic acid salt formed from the addition of a photocrosslinkable amine to a polyamic acid. The resin can include a photoinitiator suitable for initiating crosslinking of the photocrosslinkable amine when exposed to a light source of a suitable wavelength and intensity. The polyamic acid can be formed, for instance, by the addition of a diamine to a suitable dianhydride. Methods of additive manufacturing using the resins are also provided.