Polymer Nanofiber Accumulated Body with Chemical Crosslinking
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Solution Overview
Problem
Existing polymer nanofiber accumulated bodies have low mechanical strength due to physical entanglement of fibers, and previous attempts at improving strength through partial bonding treatments face challenges in controlling treatment conditions, leading to inadequate bonding or excessive melting of fibers.
Innovation Solution
Incorporating polymer nanofibers with a fiber diameter of 3 μm or less and surface-bound low-molecular weight organic compounds containing α,β-unsaturated ester structures, which interact to form intermolecular ionic bonds, enhancing crosslinking and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If physical entanglement of polymer nanofibers is used to form the accumulated body, then the structure is simple and easy to manufacture, but the mechanical strength is low and the body is weak against tensile force and friction
Solution Approach 1:
A low-molecular weight organic compound with α,β-unsaturated ester structure is introduced as an intermediary substance on the nanofiber surfaces. This compound facilitates chemical bonding between nanofibers through crosslinking reactions, acting as a mediator that transforms simple physical entanglement into chemically bonded networks, thereby significantly improving mechanical strength while maintaining ease of manufacture
Solution Approach 2:
The invention changes the bonding parameter from purely physical entanglement to chemical bonding via crosslinking. By controlling the amount of low-molecular weight organic compound (5-30 wt%) and the fiber diameter (3 μm or less), the patent optimizes the crosslinking density and network structure, achieving high mechanical strength without complicating the manufacturing process
2Strength
If partial bonding treatment by heating is applied to improve strength, then mechanical strength can be improved, but treatment conditions are difficult to control leading to either inadequate bonding or excessive melting of fibers
Solution Approach 1:
The low-molecular weight organic compound with α,β-unsaturated ester structure enables the nanofibers to self-bond through spontaneous crosslinking reactions. The compound reacts with itself and with polymer chains at ambient or moderate conditions, eliminating the need for precise external heating control. This self-service mechanism avoids both inadequate bonding and excessive melting, achieving reliable strength improvement without complex condition control
Solution Approach 2:
The invention replaces the thermal field (heating) with a chemical field (crosslinking reaction). Instead of using heat to induce bonding, the patent employs chemical reactions of the low-molecular weight organic compound to form crosslinked networks. This substitution eliminates the difficulty of controlling heating temperature and time, achieving precise bonding control through chemical stoichiometry and reaction kinetics
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 approach results in a polymer nanofiber accumulated body with significantly improved mechanical strength and durability, capable of withstanding tensile forces and friction, making it suitable for long-term use in applications like dust-collecting filters.
Implementation Method 1
the polymer nanofibers each contain 5 wt % to 30 wt % of a low-molecular weight organic compound having at least one α,β-unsaturated ester structure
Implementation Method 2
which interact to form intermolecular ionic bonds, enhancing crosslinking and mechanical strength
Data Source
AI summary
Provided is a nanofiber accumulated body having a high mechanical strength and excellent in durability, the polymer nanofiber accumulated body including polymer nanofibers each containing a polymer material, the polymer nanofibers being accumulated and three-dimensionally entangled with each other to form the accumulated body, in which: the polymer nanofibers each have a fiber diameter of 3 μm or less; and the polymer nanofibers each contain 5 wt % to 30 wt % of a low-molecular weight organic compound having at least one α,β-unsaturated ester structure, with respect to a total weight of the polymer nanofibers.