Carbon nano-tube enhanced temperature-sensitive composite hydrogel and radiation preparation method thereof

A composite hydrogel and carbon nanotube technology, which is applied in the field of carbon nanotube-enhanced temperature-sensitive composite hydrogel and radiation preparation, can solve the problems of low strength, high brittleness, poor mechanical properties, etc., and achieve simple preparation technology , improved mechanical properties, and easy to control effects

Inactive Publication Date: 2008-03-19
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the traditional PNIPA hydrogel has slow response rate and poor mechanical properties, especially low strength and high brittleness, so its application is greatly limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 (comparative example)

[0023] Weigh 5.4g of N-isopropylacrylamide (NIPA) monomer and 0.108g of cross-linking agent N,N'-methylenebisacrylamide (MBA), dissolve it in 60ml of deionized water, place in a beaker, and stir After forming a uniform and stable solution, divide it into 6 test tubes with a diameter of 15 mm, and pass through N 2 10min to remove the O in the solution 2 . Charge N 2 After the end, place the sealed test tube in 60 In the Coγ-ray irradiation field, irradiate 10kGy at a dose rate of 5.0kGy / h, and perform free radical polymerization to obtain thermosensitive PNIPA hydrogel.

[0024] The equilibrium swelling degree (SR) of PNIPA hydrogel at 25°C was 15.23, and the maximum compressive force was 1.45N.

Embodiment 2

[0026] Dissolve 0.1 g of irradiated and activated carbon nanotubes (CNTs) into 60 ml of deionized water, place in a 100 ml beaker, and ultrasonically disperse for 20 min to form a uniform and stable solution; weigh monomer N-isopropylacrylamide ( NIPA) 5.4g and cross-linking agent N, N'-methylenebisacrylamide (MBA) 0.108g were added to the above beaker, after stirring to form a uniform and stable solution, they were divided into 6 test tubes with a diameter of 15mm, and passed through Into N 2 10min to remove the O in the solution 2 . Charge N 2 After the end, ultrasonically disperse the solution in the test tube for 1 hour, and place the sealed test tube in the 60 In the Coγ-ray irradiation field, 10kGy is irradiated at a dose rate of 5.0kGy / h, and free radical polymerization is carried out to obtain a carbon nanotube-enhanced temperature-sensitive composite hydrogel.

[0027] Wherein, the irradiation and activation treatment steps of carbon nanotubes (CNTs) are as follow...

Embodiment 3

[0030] Dissolve 0.8 g of carbon nanotubes (CNTs) after irradiation and activation into 60 ml of deionized water, place in a 100 ml beaker, disperse ultrasonically for 20 min to form a uniform and stable solution, and weigh monomer N-isopropylacrylamide ( NIPA) 5.4g and cross-linking agent N, N'-methylenebisacrylamide (MBA) 0.108g were added to the above beaker, after stirring to form a uniform and stable solution, they were divided into 6 test tubes with a diameter of 15mm, and passed through Into N 2 10min to remove the O in the solution 2 . Charge N 2 After the end, ultrasonically disperse the solution in the test tube for 1 hour, and place the sealed test tube in the 60 In the Coγ-ray irradiation field, 10kGy is irradiated at a dose rate of 5.0kGy / h, and free radical polymerization is carried out to obtain a carbon nanotube-enhanced temperature-sensitive composite hydrogel.

[0031] The irradiation and activation treatment methods of carbon nanotubes (CNTs) are the same...

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Abstract

The invention discloses a carbon nano-tube-reinforced thermo-sensitive composite hydrogel and a radiation preparation method. The carbon nano-tube-reinforced thermo-sensitive composite hydrogel is composed of components as follows: (1) Zero point one to five percent of carbon nano-tubes, (2) Three to twenty percent of monomers, (3) Crosslinking agent, and (4) Water, wherein, the weight of the crosslinking agent is one to five percent of the weight of the monomers, and the diameter of the carbon nano-tube is 20 to 30 nm. After the monomers and the crosslinking agent are added into the solution, the system is aerated with inert gas N2 for ten minutes in order to remove the O2 in the system, and after being sealed, the system is dispersed by utilizing ultrasonic for one hour in order to form a stable polymerization reaction system. Afterwards, the polymerization system is put into a radiation field, radiation dosage is selected as 6 to 22 kGy, the polymerization system is irradiated by 60Co Gamma-radials or electron beams, so that a polymerization reaction occurs, the product is dipped in deionized water in order to remove the unreacted monomers and crosslinking agent, and thus the composite hydrogel is obtained. The invention has the advantages of simple polymerization process and easy control. The prepared composite hydrogel has both sensitive temperature response performance and good dynamic performance, and purity is high.

Description

technical field [0001] The invention relates to a novel polymer material prepared by radiation—composite hydrogel and its preparation method, in particular to a carbon nanotube-enhanced temperature-sensitive composite hydrogel and its preparation method by radiation. Background technique [0002] Polymer hydrogel is composed of polymers with a hydrophilic three-dimensional network structure and water. It is a hydrophilic polymer gel that can significantly swell in water but cannot be dissolved in water. Smart hydrogels are currently the most attractive type of hydrogels, and poly-N-isopropylacrylamide (PNIPA) hydrogels are a typical representative of such gels. PNIPA hydrogel has a low critical phase transition temperature (LCST) around 32°C. When the ambient temperature is lower than LCST, PNIPA hydrogel absorbs water and swells; when the ambient temperature is higher than LCST, PNIPA hydrogel will swell from high transition to the deswelled state. Based on the temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F226/10C08K3/04C08J3/075
Inventor 朱诚身杨明成何素芹刘文涛李中原宋红艳
Owner ZHENGZHOU UNIV
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