Carbon Fiber Polyarylene Sulfide Composite Production
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Solution Overview
Problem
Current methods for producing carbon fiber-reinforced polyarylene sulfides face challenges in enhancing tensile strength while maintaining productivity and preventing bleed-out during molding, which affects dynamic characteristics and molding cycle characteristics.
Innovation Solution
A method involving the mixing of polyarylene sulfide with a polycarbodiimide having at least two carbodiimide groups, followed by melt-kneading and heating to form a polycarbodiimide-modified polyarylene sulfide, which is then combined with carbon fibers, to inhibit bleed-out and improve both dynamic and molding cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the tensile elongation of polyarylene sulfide is improved to enhance tensile strength, then the tensile strength of fiber-reinforced polyarylene sulfide is improved, but the melt viscosity increases making it difficult to combine with reinforcing fibers and reducing productivity
Solution Approach 1:
The invention changes the chemical structure parameter of polyarylene sulfide by introducing aromatic ether groups into the aromatic ring structure. This structural modification reduces the melt viscosity of the polyarylene sulfide while maintaining or improving its tensile elongation properties, thereby enabling effective combination with reinforcing fibers without sacrificing productivity
Solution Approach 2:
The invention creates a composite material system by combining modified polyarylene sulfide (with improved elongation and reduced viscosity) with reinforcing fibers. The modified polymer matrix provides both the necessary mechanical properties and processability for high-quality fiber reinforcement
2Reliability
If a general polyarylene sulfide with melting point of about 285°C is used, then the material provides good heat resistance and chemical resistance, but additives are eluted during molding processing causing die contamination and impaired molding cycle characteristics
Solution Approach 1:
The invention modifies the chemical structure of polyarylene sulfide by introducing aromatic ether groups, which changes the thermal and chemical properties of the material. This structural modification reduces additive elution during molding while maintaining the high heat and chemical resistance required for metal replacement applications
Solution Approach 2:
The invention creates a modified version of polyarylene sulfide that copies the desirable properties (heat resistance, chemical resistance) of the original material while eliminating the problematic property (additive elution). The modified polymer serves as a superior substitute for the general polyarylene sulfide
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 effectively enhances the tensile strength of carbon fiber-reinforced polyarylene sulfides, reduces bleed-out, and maintains high productivity, thereby improving both dynamic and molding cycle characteristics.
Implementation Method 1
a polycarbodiimide-modified polyarylene sulfide obtained by reacting a polyarylene sulfide with a polycarbodiimide
Data Source
AI summary
A carbon fiber-reinforced polyarylene sulfide has both dynamic characteristics and molding cycle characteristics and can be produced with high productivity by preparing a polycarbodiimide-modified polyarylene sulfide using a polyarylene sulfide and a polycarbodiimide as raw materials, then melting the resulting polycarbodiimide-modified polyarylene sulfide, and combining the polycarbodiimide-modified polyarylene sulfide with carbon fibers at a specific ratio to produce a composite.