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Preparation method for nano-composite multi-response hydrogel

A multi-response and nano-composite technology, which is applied in the field of preparation of nano-composite multi-response hydrogels, can solve the problems of poor mechanical properties of chemically crosslinked hydrogels and the need to improve the strength of hydrogels, and achieve a wide range of raw material selection, Improve the strength and mechanical properties, the effect of a simple method

Inactive Publication Date: 2015-12-09
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned problems that the traditional chemically crosslinked hydrogel has poor mechanical properties and the strength of the prepared hydrogel needs to be improved, the present invention provides a method for preparing a nanocomposite multi-response hydrogel

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0021] A preparation method of nanocomposite multiple response hydrogel includes the following steps:

[0022] (1) Preparation of RAFT reagent grafted onto the surface of graphene oxide

[0023] Dissolve the graphene oxide in an organic solvent, stir well and then ultrasonically separate the graphene sheets. Then add dry RAFT reagent, stir at room temperature for 10-20 minutes, then add dehydrating agent and catalyst, and stir at room temperature for 15-24 hours. After the reaction is completed, the solvent is removed by rotary evaporation, the excess RAFT reagent is washed away with dichloromethane, and the remaining part is the graphene oxide graft, which is dried under vacuum for use;

[0024] (2) Miniemulsion polymerization of homopolymer grafted onto the surface of graphene oxide

[0025] Take the graphene oxide graft obtained in step (1) and add it to water, fully ultrasonically disperse, and then add initiator, monomer and n-hexadecane to it in sequence, fully ultrasonically di...

Embodiment 1

[0028] In 150mL of refined N,N-dimethylformamide, add 0.2g of graphene oxide, stir well and transfer to a stirring device, reflux device and N 2 In the three-necked flask at the entrance, place the three-necked flask in an ultrasonic device for 20 minutes of ultrasound to fully separate the graphene sheets, add 0.4g of pre-dried RAFT reagent, stir for 20 minutes, add 0.5g of N,N′-dicyclohexyl carbon Diimide and 0.2g 4-dimethylaminopyridine were stirred at room temperature for 24 hours. After the reaction was completed, the solvent was removed by rotary evaporation, and the excess RAFT reagent was washed away with dichloromethane. After vacuum drying, the grafted graphene oxide can be obtained. Take 20mg of the obtained graft and add it to 50mL of deionized water, fully ultrasonically disperse, and then add 0.2mg of azobisisobutamidine hydrochloride, 3g of refined acrylamide, and 0.1g of n-hexadecane to it. Fully ultrasonic dispersion, then add 0.1g of sodium dodecylbenzene sulfo...

Embodiment 2

[0030] In 150mL refined dimethyl sulfoxide, add 0.2g of graphene oxide, fully stir and transfer to equipped with stirring device, reflux device and N 2 In the three-necked flask at the entrance, place the three-necked flask in an ultrasonic device for 15 minutes to fully separate the graphene sheets, add 0.4g of pre-dried RAFT reagent, stir for 15 minutes, and add 0.5g of N,N'-diisopropyl. Carbodiimide and 0.2g 1-hydroxybenzotriazole, stirred at room temperature for 24h, after the reaction is complete, the solvent is removed by rotary evaporation, the excess RAFT reagent is washed off with dichloromethane, and dried in vacuum to obtain graphite oxide Ene grafts; add 15mg of the grafts obtained into 30mL of deionized water, fully ultrasonically disperse, and then add 0.15mg of azobisisoheptonitrile, 5g of refined acrylic acid, 0.2g of n-hexadecane, and Ultrasonic dispersion, then add 0.08g of sodium dodecylbenzene sulfonate, stir for 1h, fully ultrasonically disperse, blow nitrog...

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Abstract

The invention relates to a preparation method for nano-composite multi-response hydrogel. Added oxidized graphene has the similar lamellar structure as laponite, and meanwhile the surface of the oxidized graphene has the abundant hydroxyl and carboxyl functional groups, so that an esterification reaction can take place between the oxidized graphene and RAFT with carboxyl; precise polymers are grafted on the surface of the oxidized graphene through RAFT polymerization; the oxidized graphene serves as the crosslinking point, therefore, the strength and mechanical property of the hydrogel can be improved, and meanwhile the defect that ionic monomers cannot be used in a laponite system can be overcome; through RAFT polymerization, homopolymers or segmented copolymers are adopted as the polymers grafted on the oxidized graphene, the molecular weight of the polymers is controllable, the molecular weight distribution index is narrower (PDI=1.10-1.38), and the mole grafting rate is higher. The method is simple, and the raw material selection range is wide.

Description

Technical field [0001] The invention relates to the preparation field of hydrogels, in particular to a preparation method of nanocomposite multiple response hydrogels. Background technique [0002] Hydrogels are composed of hydrophilic polymers that can swell in water and retain a large amount of water without being dissolved into a cross-linked network. They can swell to a certain volume in water, and under certain conditions, they will dehydrate and swell. They are a kind of functional polymer material that integrates water absorption, water retention and controlled release. Due to its unique structural characteristics and physical and chemical properties, polymer hydrogel materials have broad application prospects in the fields of flexible chemical mechanical devices, selective filtration, biomedicine, and tissue engineering. However, the mechanical properties of traditional chemical cross-linked hydrogels are poor, which limits its application range to a certain extent. At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/56C08F220/06C08F220/54C08F226/06
Inventor 陈权徐锐姚大虎付永丰
Owner HENAN UNIV OF SCI & TECH
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