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Preparation method of bi-physically-crosslinked self-repairing hydrogel

A physical cross-linking and hydrogel technology, applied in the field of functional polymer materials, can solve the problems of limited application and poor mechanical properties, and achieve the effects of low raw material cost, simple and easy preparation method, and mild reaction conditions

Active Publication Date: 2017-02-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor mechanical properties of most self-healing hydrogels, their application in production and life is limited.

Method used

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  • Preparation method of bi-physically-crosslinked self-repairing hydrogel
  • Preparation method of bi-physically-crosslinked self-repairing hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put 0.79g of sodium dodecylbenzenesulfonate, 0.52g of octadecyl methacrylate and 5.48g of acrylamide in 20g of water, and stir at 35°C for 5h until dissolved to obtain a reaction precursor. Add 0.03 g of potassium persulfate to the precursor solution and stir for 30 minutes, then pour into a cylindrical mold, and react at 50°C for 12 hours to obtain a single-physically cross-linked hydrogel.

[0019] The self-repairing test is done to the sample obtained in this embodiment:

[0020] The prepared cylindrical gel was cut into two sections with a knife, and the cross-sections of the obtained two sections of gel were placed in a cylindrical mold, repaired at 60°C for 5 hours, and then the tensile strength before and after the repair was tested by a stretching machine. Compare and calculate its repair efficiency.

Embodiment 2

[0022] Disperse 0.18 g of sodium montmorillonite in 20 g of water, ultrasonicate for 3 hours, stir at room temperature for 12 hours, then add 5.48 g of acrylamide and stir at room temperature for 12 hours to obtain a montmorillonite-acrylamide aqueous solution. 0.79 g of sodium dodecylbenzenesulfonate and 0.52 g of octadecyl methacrylate were added to the above aqueous solution, and stirred at 35° C. for 5 h to obtain a reaction precursor. Then add 0.03 g of potassium persulfate to the precursor solution, and stir for 30 min, then pour into a cylindrical mold, and react at 50° C. for 12 h to obtain the double physically cross-linked self-healing hydrogel.

[0023] The self-repair test method for the sample obtained in this embodiment is the same as that in embodiment one.

Embodiment 3

[0025] Disperse 0.36g of sodium-based montmorillonite in 20g of water, ultrasonicate for 3 hours, stir at room temperature for 12 hours, then add 5.48g of acrylamide and stir at room temperature for 12 hours to obtain a montmorillonite-acrylamide aqueous solution. 0.79 g of sodium dodecylbenzenesulfonate and 0.52 g of octadecyl methacrylate were added to the above aqueous solution, and stirred at 35° C. for 5 h to obtain a reaction precursor. Then add 0.03 g of potassium persulfate to the precursor solution, and stir for 30 min, then pour into a cylindrical mold, and react at 50° C. for 12 h to obtain the double physically cross-linked self-healing hydrogel.

[0026] The preparation method of the double physically cross-linked self-healing hydrogel of this embodiment is the same as that of the second embodiment.

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PUM

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Abstract

The invention provides a preparation method of bi-physically-crosslinked self-repairing hydrogel. MMT (montmorillonite), AM (acrylamide), hydrophobic monomer SMA (stearyl methacrylate) and SDBS (sodium dodecyl benzene sulfonate) are taken as main raw materials and blended to form a precursor, and HPAAm / MMT compound hydrogel is obtained after micelle in-situ polymerization of the precursor. The raw materials are cheap and easy to obtain and the preparation process is simple. Hydrogel is dual-crosslinked in the presence of micelle and under the physical adsorption action of MMT and AM, and the mechanical strength is improved to 0.23 MPa; gel can recover to original morphology and performance after being repaired at 60 DEG C for 5 h. The prepared self-repairing hydrogel has broad application prospect in medical suture, industrial sealing, self-repairing elastomers and other fields.

Description

technical field [0001] The invention relates to a double physical cross-linked self-repairing hydrogel and a preparation method thereof, belonging to the field of functional polymer materials. Background technique [0002] Hydrogel is a special functional material with a spatial network structure filled with medium water in the structural voids. It has many similarities with biological soft tissue in structure and performance. It has strong water retention capacity, and it is not easy to lose water even under pressure. It has broad application prospects in garden technology, physiological hygiene, medicine, artificial tissue, petrochemical industry, daily necessities and other fields. [0003] Inspired by the self-healing of biological tissues after injury, self-healing hydrogels came into being. By introducing reversible hydrogen bonds, hydrophobic interactions, host-guest interactions, π-π stacking, ionic bonds or dynamic reversible chemical bonds, hydrogels are endowed ...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/18C08K3/34C08K5/42
CPCC08F220/56C08K3/346C08K5/42C08F220/1818
Inventor 施冬健汪飞叶瑾李雅瑜陈明清张洪吉
Owner JIANGNAN UNIV
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