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A process for the production of fibres

A fiber, air bubble technology used in the production of very fine fibers

Inactive Publication Date: 2011-03-30
STELLENBOSCH UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, although the patent claims universal applicability to organic solvents, the examples given demonstrate spinning only with polymer solutions in water, 2-propanol and acetone

Method used

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  • A process for the production of fibres
  • A process for the production of fibres
  • A process for the production of fibres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A solution with a concentration of 6% by weight was prepared from polyacrylonitrile (PAN) (Mw=210000 g / mol) in N,N-dimethylformamide (DMF). The foamability of the solution was tested by blowing compressed air through the solution using a thin plastic tubular nozzle at a rate of 150-3000 mL / min. The lifetime of individual bubbles formed was much lower than 1 second, and stable bubbles could not be obtained. Silicone surfactant from an industrial source (JSYK 580(L580)) was then added to the solution at a concentration of 244 g / L and the foam test was repeated. Stable foam covering the entire cell surface can be produced with a single bubble lifetime of 10-80 seconds.

[0054] refer to figure 1 , pour the fiber spinning solution (1) containing surfactant into the long groove (2) (the surface area of ​​the long groove is 36cm 2 and has an orifice (4) running centrally along its length, and is injected with air by a standard air compressor (not shown). The counter elec...

Embodiment 2

[0060] Solutions were made of polyvinyl alcohol (PVOH) (Mw = 72000 g / mol, >98% hydrolyzed) at different concentrations in distilled water with different concentrations of the surfactant sodium lauryl sulfate (SLS) as shown below:

[0061] Polymer Concentration (wt%)

Surfactant concentration (×CMC SLS) *

8

0.1

8

0.5

8

1

10

0.1

10

0.5

10

1.0

12

0.1

12

0.5

12

1.0

[0062] * 1×CMC SLS=0.0082mol / l

[0063] exist figure 1The device shown in was used with the distance between the cell (2) and the counter electrode (6) set at 10 cm. The solution containing the polymer and surfactant is poured into the tank, the air flow is turned on and adjusted to obtain a stable foam. A high voltage is applied between the solution in the cell and the counter electrode and adjusted to just above the voltage required to induce efflux in the particular solution....

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Abstract

A process is provided for producing fibres which includes forming a plurality of bubbles on the surface of a fibre spinning solution and applying a voltage between the solution and a counter- electrode spaced apart therefrom to cause jets to extend from the bubbles to the counter- electrode, characterised in that the solution is treated with a surfactant to stabilise the bubbles.

Description

technical field [0001] The present invention relates to methods of producing very fine fibers from various polymers, polymer blends, ceramic precursor mixtures and metal precursor mixtures. Background technique [0002] Very fine fibers obtained from polymer solutions, often referred to as nanofibers, are useful in a variety of applications including filter media, tissue engineering scaffold structures and devices, fiber-reinforced composites, sensors, electrodes for batteries and fuel cells, catalysts Carrier materials, wiping cloths, absorbent pads, post-surgery release agents, smart-textiles, and in artificial cashmere and artificial leather. [0003] Electrospinning of fibers was first described in US Patent 692,631. In principle, small droplets of a polymer solution or melt are placed in a high electric field. The repulsion between the same charges induced in the droplet competes with the surface tension of the liquid, and when a sufficiently strong electric field (ty...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/00
Inventor 安东·尤金·斯米特罗纳德·道格拉斯·桑德森
Owner STELLENBOSCH UNIVERSITY