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Preparation method of temperature sensitive hydrogel with shear thickening characteristic

A temperature-sensitive hydrogel, characteristic technology, applied in the field of smart hydrogel, can solve the problem of no other control source and so on

Active Publication Date: 2016-04-06
HUNAN ZHENQIU FIRE FIGHTING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the current shear-thickening gels are generally prepared by thickening through shear-thickening properties to achieve sol-gelation. This shear-thickening behavior is only affected by the volume fraction of microspheres in the suspension, and has no other sources of control

Method used

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  • Preparation method of temperature sensitive hydrogel with shear thickening characteristic
  • Preparation method of temperature sensitive hydrogel with shear thickening characteristic
  • Preparation method of temperature sensitive hydrogel with shear thickening characteristic

Examples

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Embodiment 1

[0027] Configuration mass concentration is 115g of the N-isopropylacrylamide aqueous solution of 15%, the grafted nano-SiO that is 20ml with total volume 2 Microspheres were added to it, and ultrasonically oscillated for 20 minutes in an ice-water bath to make the grafted nano-SiO 2 The microspheres were evenly dispersed in it, and 4.5ml of an aqueous solution dissolved with 0.075g of the initiator KPS and 0.14g of the catalyst TEMED was added, and ultrasonic vibration was continued for 20 minutes in an ice-water bath. The above processes were all carried out under nitrogen protection. Afterwards, the reaction vessel was sealed and placed in an ice-water bath to react for 24 hours. After taking it out, soak and change the water repeatedly with deionized water to remove unreacted monomers and solvents to obtain a gel product. Afterwards, a PEG aqueous solution with a concentration of 42% is prepared and injected into the gel through a syringe to obtain a swollen polyethylene g...

Embodiment 2

[0029] Configuration mass concentration is 96g of the N-isopropylacrylamide aqueous solution of 12%, the graft nano-SiO that is 16.8ml with total volume 2 Microspheres were added to it, and ultrasonically oscillated for 20 minutes in an ice-water bath to make the grafted nano-SiO 2 The microspheres were evenly dispersed in it, and 4ml of an aqueous solution dissolved with 0.075g of the initiator KPS and 0.14g of the catalyst TEMED was added, and ultrasonic vibration was continued for 20 minutes in an ice-water bath. The above processes were all carried out under nitrogen protection. Afterwards, the reaction vessel was sealed and placed in an ice-water bath to react for 24 hours. After taking it out, soak and change the water repeatedly with deionized water to remove unreacted monomers and solvents to obtain a gel product. Afterwards, a PEG aqueous solution with a concentration of 35.7% was prepared and injected into the gel through a syringe to obtain a swollen polyethylene g...

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Abstract

The invention relates to a preparation method of a temperature sensitive hydrogel having an obvious shear thickening characteristic which can be controlled through temperature change. The hydrogel adopts poly(N-isopropylacrylamide) crosslinking network as a matrix, a certain concentration of an aqueous solution of polyethylene glycol is swelled in the matrix, and a certain mass fraction of poly(N-isopropylacrylamide) grafted nano-SiO2 microspheres are dispersed in the aqueous solution. The hydrogel has the obvious shear thickening characteristic, the shear thickening effect of the hydrogel can be controlled through temperature, and the hydrogel has obvious temperature sensitivity.

Description

technical field [0001] The invention belongs to a preparation method of an intelligent hydrogel, and in particular relates to an intelligent hydrogel which can produce shear thickening properties and can adjust the shear thickening properties through the temperature sensitivity of the gel. Background technique [0002] Polymer gel refers to a system composed of a three-dimensional network structure of polymer compounds and a solvent, in which the polymers are connected by van der Waals force, chemical bond force, physical winding force, hydrogen bond force, etc. Since it is a three-dimensional network structure, it cannot be dissolved by solvents, and at the same time, it can be dispersed in solvents and can maintain a certain shape. Although the solvent cannot dissolve the polymer with a three-dimensional network structure, the solvophilic group in the polymer compound can be affected by the solvent to swell the polymer, which is also the reason for the formation of a pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08L29/04C08L51/00C08F285/00C08F220/54
Inventor 陈一
Owner HUNAN ZHENQIU FIRE FIGHTING IND
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