Nitrile-Modified Polyamide Fiber Spinning for Strength and UV Durability
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Solution Overview
Problem
Existing high-performance fibers, such as carbon and aramid fibers, face issues with long-term reliability due to micropore formation, limited durability under UV exposure, and high moisture absorption, while polyamides with nitrile groups struggle with breakage during spinning and require improved mechanical properties.
Innovation Solution
A spinning dope composition is developed using polymerized monomers with aromatic diamine monomers substituted with primary amide and nitrile groups, along with aromatic dibasic organic acid derivatives, allowing for high draw ratios and improved spinnability, strength, and elastic modulus, while avoiding harsh chemical treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If aramid fiber is used to achieve high strength and elongation, then strength and flexural fatigue property are improved, but durability under UV exposure deteriorates and moisture absorption increases
Solution Approach 1:
The patent uses a composite monomer system combining aromatic diamine with nitrile group, aromatic diamine with primary amide group, and aromatic dibasic organic acid derivative to create a polyamide fiber that integrates the benefits of high strength with improved UV resistance and reduced moisture absorption, eliminating the need for harsh chemical treatments
2Strength
If polyamide with nitrile group is used to achieve high strength, then strength is improved, but spinnability deteriorates due to frequent breakage during spinning
Solution Approach 1:
The patent introduces localized functional groups (primary amide groups) at specific positions within the polymer chain to modify local properties that affect spinnability, while maintaining the overall high strength characteristics provided by the nitrile-containing aromatic diamine structure
Solution Approach 2:
The patent modifies the chemical structure parameters of the polyamide by incorporating aromatic dibasic organic acid derivatives and controlling the molar ratios of monomers to achieve optimal balance between strength and spinnability, enabling high draw ratios without frequent breakage
3Strength
If carbon fiber is used to achieve high elastic modulus and strength, then elastic modulus and strength are improved, but long-term reliability deteriorates due to micropore formation
Solution Approach 1:
The patent creates a dense, micropore-free structure in the polyamide fiber through controlled polymerization and spinning processes, eliminating the micropore formation issues inherent in carbon fiber production while maintaining high elastic modulus and strength
4Strength
If aramid fiber is used to achieve high strength, then strength is improved, but ease of manufacture deteriorates due to requirement of strong acid spinning solvent
Solution Approach 1:
The patent employs conventional, easily handled spinning solvents and standard processing conditions instead of requiring strong acid environments, making the manufacturing process simpler, safer, and more economically viable while producing fibers with comparable or superior properties
Data Source
AI summary
Provided are a novel polyamide polymer obtained by polymerizing monomers including aromatic diamine substituted with a nitrile group and an amide group and an aromatic dibasic acid compound, a spinning dope comprising the same, and a polyamide molded article. A fiber obtained using the novel polyamide polymer according to the present invention, particularly, a fiber obtained by spinning the polymer according to the present invention may have high strength and high elasticity, such that the fiber may be applied to various industrial fields.