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Method for improving mechanical properties of hydrogel fibers by secondary crosslinking

A secondary cross-linking, hydrogel technology, applied in the chemical characteristics of fibers, wet spinning, chemical post-processing of synthetic polymer rayon filaments, etc., can solve the problems of continuous preparation of hydrogel fibers, poor mechanical properties, Low cross-linking degree and other problems, to achieve the effect of low production cost, improved tensile and compressive properties, and good biocompatibility

Active Publication Date: 2016-12-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the problems of difficult continuous preparation and poor mechanical properties of hydrogel fibers, the present invention designs a water-soluble molecule containing multiple double bonds in the molecular structure as a gel monomer, which is extruded by a metering pump in the spinning Set up an ultraviolet light source to establish a method for the continuous preparation of hydrogel fibers by one-step dynamic polymerization, and obtain nascent hydrogel fibers with a low degree of crosslinking during the formation of the three-dimensional network of the gel

Method used

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  • Method for improving mechanical properties of hydrogel fibers by secondary crosslinking
  • Method for improving mechanical properties of hydrogel fibers by secondary crosslinking
  • Method for improving mechanical properties of hydrogel fibers by secondary crosslinking

Examples

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Embodiment 1

[0025] A method for secondary crosslinking to improve the mechanical properties of hydrogel fibers, the specific steps are:

[0026] (1) Weigh 5 g of deionized water, 3 g of polyethylene glycol diacrylate (PEGDA, Mn=300), 0.05 g of IRGACURE 2959 at room temperature, and magnetically stir for 7 hours in the dark at room temperature until IRGACURE 2959 is completely dissolved to obtain a spinning solution;

[0027] (2) Spinning solution is injected in the syringe of 10ml measuring range, uses the capillary tube of inner diameter 0.6mm, long 2cm as spinning nozzle, utilizes metering pump to inject spinning solution from syringe through spinning nozzle into ionic water bath, advancing rate 2.5ml / h, the spinning nozzle is immersed 0.5cm below the surface of the water bath. Set a 90° ultraviolet point light source at a distance of 6 mm from the spinneret, with a wavelength of 400 m, set a drum with a diameter of 6 cm at a linear speed of 350 m / h, and collect the nascent hydrogel fi...

Embodiment 2

[0030] A method for secondary crosslinking to improve the mechanical properties of hydrogel fibers, the specific steps are:

[0031] (1) Weigh 10 g of deionized water, 7 g of PEGDA (Mn=500), and 0.03 g of IRGACURE 2959 at room temperature, and magnetically stir for 7 hours in the dark at room temperature until IRGACURE 2959 is completely dissolved to obtain a spinning solution;

[0032] (2) Spinning solution is injected in the syringe of 10ml measuring range, is spinning nozzle with the capillary tube of internal diameter 0.6mm, long 2cm, utilizes metering pump to inject spinning solution from syringe through spinning nozzle into ion water bath, propulsion speed 4ml / h, the spinning nozzle is immersed 0.5cm below the surface of the water bath. Set a 90° ultraviolet point light source at a distance of 6mm from the spinneret, with a wavelength of 400nm, set a drum with a diameter of 6cm at a linear speed of 400m / h, and collect the nascent hydrogel fibers by winding to obtain con...

Embodiment 3

[0035] A method for secondary crosslinking to improve the mechanical properties of hydrogel fibers, the specific steps are:

[0036] (1) Weigh 10 g of deionized water, 7 g of polypropylene glycol diacrylate (PPGDA, Mn=600), 0.03 g of IRGACURE 2959 at room temperature, and magnetically stir for 7 hours in the dark at room temperature until IRGACURE 2959 is completely dissolved to obtain a spinning solution;

[0037](2) Spinning solution is injected in the syringe of 10ml measuring range, is spinning nozzle with the capillary tube of internal diameter 0.6mm, long 2cm, utilizes metering pump to inject spinning solution from syringe through spinning nozzle into ion water bath, propulsion speed 4ml / h, the spinning nozzle is immersed 0.5cm below the surface of the water bath. Set a 90° ultraviolet point light source at a distance of 6mm from the spinneret, with a wavelength of 400nm, set a drum with a diameter of 6cm at a linear speed of 400m / h, and collect the nascent hydrogel fib...

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Abstract

Provided is a method for improving mechanical properties of hydrogel fibers by secondary crosslinking. The invention discloses the method for improving the mechanical properties of the hydrogel fibers by secondary crosslinking, and the method is characterized by comprising the steps: preparing a monomer aqueous solution, stirring evenly, then adding a UV initiator with good water solubility, stirring to dissolve completely under a room temperature light-shielding condition, and thus obtaining a spinning prepolymerization solution; extruding the spinning solution from a spray nozzle into water bath through a metering pump, arranging an ultraviolet light point source at an outlet of the spinning solution, under ultraviolet light irradiation, carrying out a free radical polymerization reaction of the dynamically extruded spinning solution monomer, to obtain a hydrogel as-formed fiber; and immersing the as-formed fiber in a water soluble thermal initiator solution prepared in advance, increasing the temperature, and decomposing a thermal initiator to trigger a double-bond containing polymer chain in the as-formed fiber to generate secondary crosslinking, so as to improve the mechanical properties of the gel fiber and expand the application field of the hydrogel.

Description

technical field [0001] The invention relates to the technical field of hydrogel fiber material processing, in particular to a method for improving the mechanical properties of hydrogel fibers through secondary crosslinking. Background technique [0002] Polymer hydrogel is a kind of soft wet material with three-dimensional crosslinked network structure composed of polymer and solvent water. The polymer swells in water without dissolving and can maintain a certain shape. Smart hydrogels can produce specific changes (such as: volumetric shape, optical behavior, mechanical properties, etc.) to external environmental stimuli (such as pH, light, electricity, magnetism, temperature, etc.), and can be widely used in smart sensing, enzyme immobilization, etc. , microfluidic valves, and drug release. Due to its soft and wet properties, hydrogels can be processed into various forms, such as three-dimensional body gels, two-dimensional gel films, one-dimensional gel fibers, and zero-d...

Claims

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Application Information

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IPC IPC(8): C08F299/02C08F122/20C08F2/48C08F4/30C08J3/24C08J3/075D01F6/16D01F11/06D01D5/06C08L57/00C08L35/02
CPCC08F2/48C08F4/30C08F122/1006C08F299/024C08F299/028C08J3/075C08J3/24C08J2335/02C08J2357/00D01D5/06D01F6/16D01F11/06
Inventor 朱美芳危培玲侯恺夏梦阁孟周琪成艳华周哲
Owner DONGHUA UNIV
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