Acrylamide Precursor with Acid Catalyst for Carbon Yield
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Solution Overview
Problem
The high production cost of carbon fibers due to the use of expensive solvents for polyacrylonitrile-based carbon fiber precursors and the low carbonization yield of polyacrylamide-based carbon material precursors, which limits their effectiveness.
Innovation Solution
A carbon material precursor containing an acrylamide-based polymer and an addition component selected from acids and salts, such as phosphoric acid, is used, which improves carbonization yield by acting as a catalyst during thermal-stabilization and carbonization processes, allowing for production in an oxidizing and inert atmosphere respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyacrylonitrile is used as carbon fiber precursor, then carbon fiber quality is maintained, but production cost increases due to expensive solvents
Solution Approach 1:
The patent replaces expensive solvents (dimethyl sulfoxide, N,N-dimethylacetamide) with inexpensive water as the solvent for polyacrylamide-based carbon fiber precursor. This substitution dramatically reduces production costs while maintaining the ability to produce high-quality carbon fibers through controlled thermal stabilization and carbonization processes.
2Ease of manufacture
If polyacrylamide is used as carbon material precursor, then production cost decreases due to water-solubility, but carbonization yield becomes low
Solution Approach 1:
The patent systematically optimizes multiple parameters including: acrylamide polymerization degree (affecting molecular weight and structure), addition component selection (acids such as phosphoric acid, sulfuric acid, nitric acid, or their salts), addition component content (0.1-20 mass%), and thermal treatment conditions (thermal stabilization at 500°C or lower in oxidizing atmosphere, followed by carbonization in inert atmosphere). These parameter changes transform polyacrylamide from a low-yield precursor into a high-yield carbon material precursor.
Solution Approach 2:
The patent introduces addition components (acids or their salts) as intermediaries that catalyze the thermal stabilization process. These addition components facilitate dehydration reactions during heating, promoting the formation of a highly heat-resistant structure in the acrylamide-based polymer, thereby significantly improving carbonization yield from approximately 20% to much higher values.
3Temperature
If polyacrylamide precursor is heated to 500°C, then thermal stabilization occurs, but mass retention is poor with only 20% carbonization yield
Solution Approach 1:
The addition components (acids or salts) act as catalysts during thermal stabilization at 500°C or lower, promoting controlled dehydration reactions that transform the polyacrylamide structure into a highly heat-resistant configuration. This catalytic action reduces mass loss and improves carbonization yield compared to uncatalyzed thermal stabilization.
Solution Approach 2:
The patent optimizes the thermal treatment parameters including heating temperature (500°C or lower for thermal stabilization), heating atmosphere (oxidizing for thermal stabilization, inert for carbonization), and heating rate. These parameter optimizations, combined with the addition components, significantly improve mass retention during thermal stabilization.
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
This approach enhances the carbonization yield of the carbon material precursor, enabling the production of carbon materials at a lower cost while maintaining high quality, as evidenced by improved mass retention during heating.
Implementation Method 1
an acid or a salt thereof which is the addition component functions as a catalyst for the dehydration reaction of the acrylamide-based polymer and the structure of the acrylamide-based polymer transforms to a highly heat-resistant structure
Implementation Method 2
the addition component functions as a catalyst for the dehydration reaction of the acrylamide-based polymer
Implementation Method 3
thermally-stabilizing a carbon fiber precursor obtained by spinning polyacrylonitrile; and then carbonizing the carbon fiber precursor
Implementation Method 4
heating under an oxidizing atmosphere at a temperature of 500° C. or lower
Implementation Method 5
carbonizing the thermally-stabilized carbon material precursor by heating under an inert atmosphere at a temperature higher than the heating temperature during the thermal-stabilization
Data Source
AI summary
A carbon material precursor comprises an acrylamide-based polymer and at least one addition component selected from the group consisting of acids and salts thereof; and a method for producing a carbon material comprises thermally-stabilizing the carbon material precursor and then carbonizing the carbon material precursor.