Natural Silk Fiber Swelling and Stretching for Spider-Silk-Like Strength
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Solution Overview
Problem
Natural silk fibers face limitations in mechanical properties due to their stable anti-parallel β-sheet crystal structures, making it difficult to enhance their performance through physical stretching, and existing methods for improving silk fibers often result in irreversible destruction of the multi-stage structure, leading to poor mechanical properties in regenerated fibers.
Innovation Solution
A method involving the use of a silk swelling liquid with specific acids and inorganic salts to treat natural silk fibers, allowing for physical stretching or shrinkage, which modifies the fiber structure and improves mechanical properties without dissolving the silk, thereby achieving high-performance natural silk fibers suitable for applications like body armor and sutures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If natural silk fibers are physically stretched to improve mechanical properties, then fiber strength and elongation can be enhanced, but the stable anti-parallel β-sheet crystal structure prevents effective stretching and structural modification
Solution Approach 1:
The patent applies parameter changes by using chemical agents (acids and bases) to modify the crystal structure parameters of silk fibers. The swelling liquid containing acid breaks down the stable anti-parallel β-sheet crystal structure, allowing subsequent stretching to reorganize the protein chains into more ordered structures with improved mechanical properties.
Solution Approach 2:
The patent uses swelling liquids containing acids and bases as intermediaries to mediate between the stable crystal structure and the desired stretched configuration. These chemical intermediaries temporarily disrupt the crystal structure, enabling mechanical stretching, and then allow reformation of a more ordered structure upon drying.
2Strength
If silk is dissolved and then spun to obtain higher performance fibers, then mechanical properties can be improved, but the irreversible destruction of the multi-stage structure causes poor fiber structure stability
Solution Approach 1:
The patent applies partial action by using swelling liquids that partially disrupt the crystal structure rather than complete dissolution. The acid and base treatments selectively modify certain regions of the fiber structure while preserving the overall integrity, allowing stretching without complete breakdown of the multi-stage structure.
Solution Approach 2:
The patent uses preliminary chemical treatment with swelling liquids to prepare the fiber structure before mechanical stretching. This preliminary action of controlled structural modification enables subsequent stretching to be more effective while maintaining structure stability, avoiding the need for complete dissolution and regeneration.
3Strength
If transgenic technology is used to transform the primary structure of silk to achieve spider silk-like properties, then mechanical properties can be improved, but industrialization cannot be achieved due to technical complexity
Solution Approach 1:
The patent uses copying by applying chemical treatments and mechanical processing to natural silk fibers to achieve spider silk-like properties without genetic modification. The swelling liquid treatment followed by stretching creates a structural copy of spider silk's high-performance characteristics using conventional silk as the base material.
Solution Approach 2:
The patent replaces the complex biological system of transgenic silk production with a simpler chemical-mechanical processing system. Instead of genetically modifying silkworms, the invention uses chemical swelling liquids and mechanical stretching to achieve the desired structural transformation, significantly reducing technical complexity.
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 significantly increases the breaking strength and elongation of natural silk fibers, achieving values over 1000 MPa and 50% elongation, respectively, while maintaining stability and enabling large-scale production, surpassing previous methods in terms of mechanical performance.
Implementation Method 1
a silk swelling liquid with specific acids and inorganic salts to treat natural silk fibers
Data Source
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AI summary
A high performance natural silk fiber and a preparation method thereof, wherein silk, raw silk, twisted silk or braided silk thread is used as the raw material, which then becomes a high performance silk fiber after being shrunk or stretched; more specifically, a silk swelling solution is prepared by mixing an inorganic salt, an acid and water according to a certain ratio, the silk fiber is then immersed in the swelling solution in order to be stretched/shrunk; and finally the high performance silk fiber is obtained following rinsing with clean water, neutralizing and drying. The preparation method is simple and effective, and has a short process. The breaking strength of the silk fiber prepared by means of this method is comparable to that of spider silk. Therefore, it is well suited for application in high-tech fields, such as artificial ligaments, ophthalmic sutures, protective clothing, etc.