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Preparation method of double physical cross-linked polyacrylic acid hydrogel with high strength and high toughness

A technology of physical cross-linking and polyacrylic acid, applied in the field of polymer materials, can solve the problems of difficult to stabilize hydrogel properties and difficult mass production, and achieve the effects of excellent self-healing performance, short production cycle, and easy availability of raw materials

Active Publication Date: 2020-06-02
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, interpenetrating network hydrogels of two or more polymers need to introduce multiple polymers to form heterogeneous polymers. Only when proper topological structures are formed between different polymers can high mechanical properties be achieved. At the same time, heterogeneous polymers can easily lead to the difficulty in stabilizing the properties of hydrogels. Therefore, it is currently limited to experimental research and it is difficult to achieve industrial mass production.

Method used

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  • Preparation method of double physical cross-linked polyacrylic acid hydrogel with high strength and high toughness
  • Preparation method of double physical cross-linked polyacrylic acid hydrogel with high strength and high toughness
  • Preparation method of double physical cross-linked polyacrylic acid hydrogel with high strength and high toughness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1): Weigh 1.095g STA (0.067mol / L), 3.5g SDS (0.243mol / L), and 3mL n-amyl alcohol (0.567mol / L) respectively in a three-necked flask, then add 27mL deionized water, and Stir at high speed in a water bath at 45°C for 1 hour to obtain a uniform and transparent emulsion.

[0028] Step 2): Weigh 15.426mL AAc (4.5mol / L), 0.135g Fe(NO 3 ) 3 9H 2 O (0.006mol / L), 0.033g KA (0.0045mol / L) in the emulsion of step 1), continue stirring at the same temperature and speed for 1 hour under a dark environment, and prepare AAc with 4.5mol / L, Fe 3+ 0.006mol / L, STA 0.067mol / L mixed solution.

[0029] Step 3): Inject the mixed solution obtained in step 2) into a glass mold under light-shielding conditions, place the glass mold under a UV lamp at 20 cm for 10 to 12 hours, and obtain high-strength, high-toughness fully physical double crosslinking PAAc hydrogel.

[0030] Experiments show that the tensile strength of the double physically cross-linked PAAc hydrogel material obtained in...

Embodiment 2

[0033] Step 1): Weigh 1.095g STA (0.067mol / L), 3.5g SDS (0.243mol / L), and 3mL n-amyl alcohol (0.567mol / L) respectively in a three-necked flask, then add 27mL deionized water, and Stir at high speed in a water bath at 40°C for 0.5 hour to obtain a uniform and transparent emulsion.

[0034] Step 2): Weigh 15.426mL AAc (4.5mol / L), 0.398g Fe(NO 3 ) 3 9H 2 O (0.0197mol / L), 0.033g KA (0.0045mol / L) in the emulsion of step 1), continue stirring at the same temperature and speed for 0.5 hours under a dark environment, and prepare AAc with 4.5mol / L, Fe 3+ 0.0197mol / L, STA 0.067mol / L mixed solution.

[0035] Step 3): inject the mixed solution obtained in step 2) into a glass mold under the condition of shading, and place the glass mold under a UV lamp at 30 cm for 10 to 12 hours to obtain high-strength, high-toughness fully physical double cross-linking PAAc hydrogel.

[0036] Experiments show that the tensile strength of the double physically cross-linked PAAc hydrogel material obt...

Embodiment 3

[0039] Step 1): Weigh 1.785g STA (0.11mol / L), 3.5g SDS (0.243mol / L), and 3mL n-amyl alcohol (0.567mol / L) respectively in a three-necked flask, then add 23mL deionized water, and Stir at high speed in a water bath at 50°C for 1.5 hours to obtain a uniform and transparent emulsion.

[0040] Step 2): Weigh 18.855mL AAc (5.5mol / L), 0.324g Fe(NO 3 ) 3 9H 2 O (0.016mol / L), 0.040g KA (0.0045mol / L) in the emulsion of step 1), continue stirring at the same temperature and speed for 1.5 hours in a dark environment, and prepare AAc with 5.5mol / L, Fe 3+ 0.016mol / L, STA 0.11mol / L mixed solution.

[0041] Step 3): Inject the mixed solution obtained in step 2) into a glass mold under light-shielding conditions, place the glass mold under a UV lamp at 10 cm for 10 to 12 hours, and obtain high-strength, high-toughness fully physical double crosslinking PAAc hydrogel.

[0042] Experiments show that the tensile strength of the double physically cross-linked PAAc hydrogel material obtained i...

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Abstract

The invention discloses a preparation method of full-physical bi-crosslinked polyacrylic acid high-strength and high-toughness hydrogel. According to the technical scheme, the preparation method comprises the following steps: firstly dissolving stearyl acrylate (STA), sodium dodecyl sulfate (SDS) and n-pentyl alcohol to obtain transparent emulsion, then adding acrylic monomers, iron nitrate nonahydrate and a photoinitiator, fully stirring to obtain a uniform mixed solution, initiating under a ultraviolet irradiation condition to enable the acrylic monomers to be polymerized, taking hydrophobicassociation formed by virtue of hydrophobic micelles and polyacrylic acid as a first physical crosslinking point (soft crosslinking point), and taking coordination complexation formed by ferric ionsand polyacrylic acid as a second physical crosslinking point (hard crosslinking point), so that full-physical bi-crosslinked hydrogel formed under the dual function, realizes that crosslinking with 'soft' and 'hard' bi-physical forces exists on a molecular chain. The preparation method disclosed by the invention is not only easy in operation, and a product is excellent in performance and can be used as a biological soft tissue substitute.

Description

technical field [0001] The invention belongs to polymer materials, in particular to a preparation method of high-strength and high-toughness hydrogel. Background technique [0002] Hydrogel is a polymeric three-dimensional network composed of hydrophilic polymers, which can absorb a large amount of water, and is soft and elastic after absorbing water. This characteristic is similar to that of biological soft tissue, which makes hydrogel widely used in the field of tissue engineering. has a wide range of potential applications. Because hydrogels generally have poor mechanical properties, and chemically crosslinked hydrogels also have the disadvantage of poor tissue compatibility, they cannot meet the requirements of use. Biological soft tissues are mostly constructed by physical cross-linking of linear molecular chains in an orderly manner. The chemically cross-linked hydrogels currently used still have the disadvantages of being difficult to repair after cross-linking damag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F220/18C08F2/48C08J3/24C08J3/075
Inventor 李学锋赵友姣张高文龙世军舒萌萌张奕坤邱迪
Owner HUBEI UNIV OF TECH
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