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Method for grafting polymer on inorganic material surface

An inorganic material and surface grafting technology, which is applied in the field of inorganic material surface grafting polymers, can solve the problems of particle agglomeration, reduce the grafting rate, cannot ensure the intact coating of hydroxypropyl cellulose, etc., and achieve high grafting. The effect of high rate, high reactivity

Inactive Publication Date: 2009-11-25
ZHEJIANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that in this system, hydroxypropyl cellulose is a polyhydroxy compound, which is adsorbed together with the hydroxyl groups on the surface of nano-titanium dioxide through weak hydrogen bond interactions. Therefore, the hydroxypropyl cellulose cannot be guaranteed The cellulose can completely cover the nano-titanium dioxide, which will easily lead to incomplete coating of the nanoparticles, and the shedding hydroxypropyl cellulose can cause more homopolymers to be formed in the reaction solution, thereby reducing the grafting rate and easily causing agglomeration between particles
However, the metal oxide particles have not undergone any chemical modification, and the hydroxyl radicals in the reaction system are adsorbed on the surface of the metal oxide particles by physical adsorption, which cannot inhibit the generation of homopolymers. The grafting ratio given in the examples Generally <20%, the highest is 58%

Method used

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  • Method for grafting polymer on inorganic material surface
  • Method for grafting polymer on inorganic material surface
  • Method for grafting polymer on inorganic material surface

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Treat the silica microspheres with silane coupling agent KH550 to make the silica carry amino groups, soak in monoepoxy polyoxyethylene for 24 hours, the reaction temperature is 40 degrees, and make the polyoxyethylene ester pass through the covalent Bond grafted on the surface of silica, then wash, disperse in water by stirring or ultrasonic vibration, add 0.001 mole of ammonium cerium nitrate and 1 mole of methyl methacrylate, adjust the pH to about 2 with nitric acid, remove oxygen and Carry out the grafting reaction for 24 hours under the protection of nitrogen, wash and filter, remove the residual redox initiation system, monomer or homopolymer composed of high-valent cerium salt and inorganic material surface treatment agent, and obtain surface-grafted polymethacrylic acid Methyl ester silica microspheres ( figure 2 ), the thermogravimetric curve see Figure 4 (b), the grafting rate is 25.6%.

[0035] The TEM photos of the silica microspheres before grafting ar...

Embodiment 2

[0037] The preparation method is the same as in Example 1, except that the obtained silica microspheres grafted with polyoxyethylene acrylate on the surface are dispersed in water, 0.0005 moles of cerium ammonium nitrate and 2 moles of N-isopropylacrylamide are added, and the Adjust the pH to about 1, deoxygenate and carry out the grafting reaction for 48 hours under the protection of nitrogen, remove the surface residue, and obtain the silica microspheres ( image 3 ), the grafting rate is 63.7%, and the thermogravimetric curve is shown in Figure 4 (c).

Embodiment 3

[0039] Disperse hydroxyapatite in water, add sodium alginate, repeatedly suction filter and purify, and remove excess sodium alginate. Then add 0.0001 mole of cerium ammonium nitrate and 1 mole of N-isopropylacrylamide, adjust the pH to about 2 with nitric acid, remove oxygen and carry out grafting reaction under nitrogen protection for 24 hours to remove surface residues and obtain surface grafting Poly(N-isopropylacrylamide) hydroxyapatite has a graft rate of 72.5%.

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Abstract

The invention discloses a method for grafting polymers on the surface of inorganic materials. First of all, polyoxyethylene or polyethylene glycol with amino or hydroxyl groups at the chain end or compounds containing glucose units are fixed on the surface of inorganic materials through covalent bonds or ionic bonds, so that the surface has reducing organic chemical groups. Then, add high-valent cerium salts and polymerizable monomers, use high-valent cerium salts and reducing organic groups on the surface of inorganic materials to form an oxidation-reduction initiating system, and initiate the polymerization of monomers under acidic conditions, so that the polymer can be connected branches to the surface of inorganic materials. The method of the present invention can conveniently graft polymers to the surface of inorganic materials, has the advantages of simple and convenient reaction process, mild reaction conditions and high grafting rate, and is especially suitable for grafting water-soluble polymers or polymer hydrogels on the surface of inorganic materials. Thin layer of glue.

Description

technical field [0001] The invention relates to a method for grafting polymers on the surface of inorganic materials. Background technique [0002] Grafting polymers on the surface of inorganic materials, that is, chemically bonding polymers to the surface of inorganic materials, can endow inorganic materials with new surface physical and chemical properties, which is of great significance for scientific research and many industrial applications. For example, polymer grafting on the surface of nanoparticles is one of the research hotspots. Grafting polymers on the surface of nanoparticles is of great significance for the design of new functional organic / inorganic hybrid materials. This hybrid material can not only have the heat resistance and chemical resistance of inorganic substances, but also have the dispersibility, stability, biological activity, biocompatibility and environmental response characteristics of grafted polymers. In addition, materials used for implantatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F292/00
Inventor 彭懋王慧珺
Owner ZHEJIANG UNIV
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