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Liquid crystal-enhanced fast response temperature sensitive hydrogel and preparation method thereof

A temperature-sensitive hydrogel and responsive technology, applied in the field of liquid crystal materials and smart polymer materials, can solve the problems of no temperature-sensitive properties, no liquid crystal components, improved mechanical properties, etc., and achieve excellent rapid temperature response and mechanical properties. The performance, the preparation method is simple, and the cost is low.

Inactive Publication Date: 2011-02-16
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of the gels reported so far have any temperature-sensitive properties, and there is no report on improving the mechanical properties
In addition, the photopolymerization method reported in the literature requires special photopolymerization equipment, and although the reaction time is short, the illumination is not uniform
Finally, in terms of improving the mechanical properties of temperature-sensitive hydrogels, Chinese patent CN 101143914B discloses a carbon nanotube-enhanced temperature-sensitive composite hydrogel and a radiation preparation method, and Chinese patent CN 101161689B discloses a Incorporation of microgels to prepare hydrogels with fast response and high mechanical properties, but neither involving liquid crystal components

Method used

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  • Liquid crystal-enhanced fast response temperature sensitive hydrogel and preparation method thereof
  • Liquid crystal-enhanced fast response temperature sensitive hydrogel and preparation method thereof
  • Liquid crystal-enhanced fast response temperature sensitive hydrogel and preparation method thereof

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Effect test

Embodiment 1

[0039] Add 2.0g of polyoxyethylene (23) lauryl ether (Brij 35), 0.15g of methylenebisacrylamide, and 1.45g of isopropylacrylamide into 10mL of deionized water in sequence, and pass it into a sealed container at 20°C Nitrogen, stirred for 60min until a completely dispersed uniform mixed aqueous solution was formed; the above mixed aqueous solution was cooled to 1°C with ice cubes, 0.015g of potassium persulfate was added after 30min, and 50μL of N,N,N'N'-tetramethyl was injected after 10min Under the protection of nitrogen, continue to stir for 10 minutes; immediately pour the stirred reaction solution into a glass mold with a thickness of 2mm, seal it and let it stand for reaction at 20°C for 40h, then cut the reaction product into uniform size, and soaked in deionized water for 2 weeks to obtain the liquid crystal-enhanced fast-responsive thermosensitive hydrogel.

[0040] The obtained hydrogel: the volume phase transition temperature is 32.6°C, at 37°C, the water loss rate e...

Embodiment 2

[0042] Add 0.5g of polyoxyethylene (20) cetyl alcohol ether (Brij 58), 0.10g of methylenebisacrylamide, 1.50g of isopropylacrylamide into 11mL of deionized water in sequence, and in a sealed container at 20°C, pass through Add nitrogen gas and stir for 45 minutes until a completely dispersed uniform mixed aqueous solution is formed; cool the above mixed aqueous solution to 3°C with ice cubes, add 0.010 g of ammonium persulfate after 30 minutes, and inject 40 μL of N, N, N'N'-Tetra Methylethylenediamine, under the protection of nitrogen, continue to stir for 10 minutes; immediately pour the stirred reaction solution into a glass mold with a thickness of 2mm, seal it and let it stand for 20 hours at 28°C, then cut the reaction product into pieces with a knife uniform size, and soaked in deionized water for 2 weeks to obtain the liquid crystal-enhanced fast-responsive thermosensitive hydrogel.

[0043] The obtained hydrogel: the volume phase transition temperature is 31.2°C, at 3...

Embodiment 3

[0045] Add 1.5g of polyoxyethylene (4) lauryl ether (Brij 30), 0.15g of ethylene glycol dimethacrylate, and 1.45g of diethylacrylamide into 10mL of deionized water in sequence, in a sealed container at 20°C, Inject nitrogen gas and stir for 80 minutes until a completely dispersed uniform mixed aqueous solution is formed; cool the above mixed aqueous solution to 3°C with ice cubes, add 0.015 g of ammonium persulfate after 30 minutes, and inject 50 μL of sodium bisulfite after 10 minutes, under nitrogen protection, Continue to stir for 10 minutes; immediately pour the stirred reaction solution into a glass mold with a thickness of 2mm, seal it and let it stand for 30 hours at 25°C, then cut the reaction product into a uniform size with a knife, and soak it in deionized water for 2 Weeks, the liquid crystal enhanced fast response temperature-sensitive hydrogel was obtained.

[0046] The obtained hydrogel: the volume phase transition temperature is 32.3°C, at 37°C, the water loss ...

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Abstract

The invention relates to a liquid crystal-enhanced fast response temperature sensitive hydrogel and a preparation method thereof. The hydrogel contains the following three components in percent by weight: 10-58 percent of amphiphilic liquid crystal molecule polyoxyethylene fatty alcohol ether M1, 2-10 percent of alkadiene M2 both ends of which contain double bonds and 40-80 percent of alkyl acrylamide M3 with temperature sensitivity. In the preparation method, by taking the Mi as a temperature in an aqueous solution, liquid crystal molecules are removed through soaking after the polymerization is ended to obtain the hydrogel with fast temperature response and mechanical property. The hydrogel is transparent to milky in appearance, and the internal hole dimensions are 1-10 mu m. The method has simple preparation process, is easy to control and can be used for manufacturing various shapes of hydrogel; and the temperature sensitivity and the mechanical property of the hydrogel can be regulated through changing the density, the water content and the components of a cross-linking agent. The hydrogel can be used for the fields of biology, sensing and the like.

Description

technical field [0001] The invention relates to the fields of liquid crystal materials and intelligent polymer materials, in particular to a liquid crystal-enhanced fast-response temperature-sensitive hydrogel and a preparation method thereof. The hydrogel can be applied in the fields of sensors, biomedicine, separation and purification, and the like. Background technique [0002] Hydrogel is a kind of hydrophilic cross-linked polymer between liquid and solid that can significantly swell in water and retain a large amount of water but cannot be dissolved in water. It can accommodate several times or even hundreds of times the weight of the polymer itself. of water. Smart hydrogels are reversibly responsive to external stimuli and swellable in water. When the environment where the hydrogel is located, such as temperature, pH value, ions, electric field, magnetic field, light, etc., changes, the shape, pore size, mechanics, optics, spatial structure, surface properties, reco...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08F2/44C08F222/38C08F222/14C08J9/26C08F220/54
Inventor 张青松陈莉陈坤赵义平王晶晶
Owner TIANJIN POLYTECHNIC UNIV
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