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Preparation method of gel nano particles in thermosensitivie nuclear shell structure and application of product thereof

A technology of core-shell structure and nanoparticles, which is applied in the preparation of temperature-sensitive core-shell structure gel nanoparticles and the application of products, which can solve the problems of catalytic rate decline and achieve good stability

Inactive Publication Date: 2012-12-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, the temperature-sensitive microgel system loaded with metal particles has attracted widespread attention in the field of catalysis, because this system can still have temperature responsiveness after loading metal particles, that is, stretching at low temperatures allows the reaction to proceed, However, when the temperature is higher than the phase transition temperature, the system shrinks and the catalytic rate decreases significantly.

Method used

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  • Preparation method of gel nano particles in thermosensitivie nuclear shell structure and application of product thereof
  • Preparation method of gel nano particles in thermosensitivie nuclear shell structure and application of product thereof
  • Preparation method of gel nano particles in thermosensitivie nuclear shell structure and application of product thereof

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Embodiment 1

[0024] Add 35 ml of polybutadiene core (11.5% solid content) and 165 ml of water into a three-necked flask, use mechanical stirring (300 rpm) to fully dissolve, vacuumize and fill with nitrogen for 3 times, Under protection, the temperature was raised to 70°C, and after stabilization, 0.5 grams of potassium persulfate, a thermal initiator dissolved in water, was added. After reacting for 30 minutes, 2.0 grams of N-isopropylacrylamide monomer dissolved in water and N, N'- 0.07 g of methylenebisacrylamide crosslinking agent. After reacting for 1.5 hours, the microgel emulsion was obtained, and the particle diameter of the temperature-sensitive core-shell gel nanoparticles was measured at 25° C. by a dynamic light scattering instrument to be 712 nanometers.

Embodiment 2

[0026] Add 35 ml of polybutadiene core (11.5% solid content) and 165 ml of water into a three-necked flask, use mechanical stirring (350 rpm) to fully dissolve, vacuumize and fill with nitrogen for 3 times. Under protection, the temperature was raised to 80°C, and after stabilization, 0.3 grams of potassium persulfate, a thermal initiator dissolved in water, was added. After 20 minutes of reaction, 1.25 grams of N-isopropylacrylamide monomer dissolved in water and N, N'- 0.08 g of methylenebisacrylamide crosslinking agent. After reacting for 2 hours, a microgel emulsion was obtained, and the particle size of the temperature-sensitive core-shell gel nanoparticles was measured at 25° C. by a dynamic light scattering instrument to be 650 nm.

Embodiment 3

[0028] The solid content of Example 1 or Example 2 is that 120 milliliters of 2% nano-microgel emulsion is placed in a 500 milliliter three-neck flask, and 240 milliliters of deionized water is added, and 0.0672 grams of silver nitrate solid is dissolved in 40 milliliters of deionized The water is then added to a three-necked flask, vacuumized and filled with nitrogen 3 times to maintain a nitrogen atmosphere. At room temperature, after fully stirring with mechanical stirring at 300 rpm for 3 hours, the emulsion was placed in an ice bath for 1 hour, and then 0.1656 grams of sodium borohydride solution dissolved in 10 milliliters of deionized water was quickly poured into the dripping solution In the funnel, drip into the three-necked flask solution at a rate of 2 seconds / drop. Keeping the ice bath and continuing to stir and react for 1.5 hours, stop the reaction, put the reaction product into a dialysis bag and dialyze for one week to obtain temperature-sensitive nanogel parti...

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Abstract

The invention discloses a preparation method of gel nano particles in a thermosensitivie nuclear shell structure and an application of a product thereof. Thermosensitive microgel is prepared by the preparation method by using polybutadiene nanometer emulsion particles as nucleus, grafting poly(N-isopropyl acrylamide) on the surface of the nucleus by a free radical polymerization method under the effect of a cross-linking agent. The microgel can be used as a nano reactor. Nano silver particles with controllable particle size and distribution are prepared through an in-situ reduction reaction. The microgel carrying the nano silver particles can be used as a high-performance catalyst, a bacteriacide and the like.

Description

technical field [0001] The present invention relates to a preparation method and application of a novel core-shell nanogel, in particular, it is to prepare cross-linked poly(N-isopropylacrylamide) microgels by free radical polymerization on the surface of polybutadiene emulsion particles. Gel particles are used as a reactor and carrier system to prepare and load silver nanoparticles in situ, and the resulting composite nanogels can be used as high-efficiency catalysts and bactericides. Background technique [0002] In recent years, noble metal nanoparticles have received great attention mainly because of the high specific surface area and high catalytic activity of these particles. But if you want to give full play to the catalytic properties of these metal nanoparticles, you must prevent the agglomeration of the particles and maintain their good dispersion. Therefore, it is very important to find a suitable preparation method and loading system for the application of metal...

Claims

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Application Information

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IPC IPC(8): C08F279/02B01J31/06A01N25/10A01N59/16A01P1/00C07C213/02C07C215/76
Inventor 郭旭虹张锐刘洋李公生李文玥陈晖晗许军李莉房鼎业
Owner EAST CHINA UNIV OF SCI & TECH
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