Acrylamide Polymer Carbon Precursor Yield and Cost
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for producing carbon fibers using polyacrylonitrile result in high production costs due to the need for expensive solvents and yield low thermal-stabilization and carbonization yields when using polyacrylamide-based precursors.
Innovation Solution
A carbon material precursor formed from an acrylamide-based polymer with a low polydispersity of molecular weight, combined with addition components like acids and salts, is thermally stabilized and carbonized to achieve high thermal-stabilization and carbonization yields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyacrylonitrile is used as the carbon fiber precursor, then the mechanical strength and processability are improved, but the production cost increases due to expensive solvents
Solution Approach 1:
The patent replaces expensive solvents (dimethyl sulfoxide, N,N-dimethylacetamide) with water, which is inexpensive and environmentally friendly. This substitution significantly reduces production costs while maintaining the ability to dissolve polyacrylonitrile and form spinable solutions through controlled polymerization and solvent exchange processes
Solution Approach 2:
The patent controls the molecular weight and molecular weight distribution of polyacrylonitrile through controlled polymerization conditions. By optimizing these parameters, the invention achieves both good processability (spinability) and high mechanical strength in the final carbon fiber product
2Ease of manufacture
If polyacrylamide is used as the carbon material precursor, then the production cost is reduced due to water solubility, but the thermal-stabilization yield and carbonization yield greatly decrease
Solution Approach 1:
Instead of using polyacrylamide and attempting to improve its thermal stability, the patent inverts the approach by using polyacrylonitrile (which has inherent thermal stability) with water as the solvent. This reversal maintains both low production costs and high thermal-stabilization yields
Solution Approach 2:
The patent uses water as an inexpensive solvent alternative to expensive organic solvents, achieving both cost reduction and high yield by selecting polyacrylonitrile as the precursor that is compatible with water-based processing
3Ease of manufacture
If generally-used polyacrylamide is used as the carbon material precursor, then the water solubility and cost-effectiveness are improved, but the mass is greatly reduced by thermally-stabilizing treatment and carbonizing treatment
Solution Approach 1:
The patent inverts the conventional approach by using polyacrylonitrile instead of polyacrylamide as the precursor. This inversion maintains water solubility and cost-effectiveness while dramatically improving mass retention during thermal processing, as polyacrylonitrile inherently resists thermal decomposition
Solution Approach 2:
The patent uses water as a cheap solvent and polyacrylonitrile as a cost-effective precursor that maintains high molecular weight through thermal processing, achieving both economic advantages and high mass retention
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 significantly improves the yield of carbon materials while reducing production costs by using water-soluble acrylamide-based polymers and promoting heat-resistant structures through deammoniation and dehydration reactions.
Implementation Method 1
conducting the thermally-stabilizing treatment causes an imide ring structure having a high heat resistance to be formed by deammoniation reaction
Implementation Method 2
causes an unsaturated bond to be formed by dehydration reaction and the like after partial oxidation reaction and the like
Implementation Method 3
performing carbonizing treatment thereon
Data Source
AI summary
A carbon material precursor comprises an acrylamide-based polymer having a weight-average molecular weight of 10,000 to 2,000,000 and a polydispersity of the molecular weight (weight-average molecular weight/number-average molecular weight) of 5.0 or less.