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Method for grafting polymer on inorganic material surface

An inorganic material, surface grafting technology, applied in the field of inorganic material surface grafting polymer, can solve the problems of reducing the grafting rate, particle agglomeration, unable to suppress the homopolymer, etc., and achieve high reactivity and high grafting rate. Effect

Inactive Publication Date: 2008-04-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • 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

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 Silica microspheres of methyl ester (Fig. 2), the thermal weight loss curve is shown in Fig. 4(b), and the grafting rate is 25.6%.

[0035] The TEM photo of the silica microspheres before grafti...

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 grafting reaction under nitrogen protection for 48 hours to remove surface residues to obtain silica microspheres grafted with poly-N-isopropylacrylamide on the surface (Figure 3). The 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 present invention discloses a method of grafting a polymer on the surface of the inorganic materials. The polyethylene oxide or polyethylene glycol which contains amino or hydroxyl at the chain-end by a covalent bond or an ionic bond, or a compound containing glucose units is firstly fixed at the surface of the inorganic materials, so as to have a reductive organic chemical group on the surface; then a high cerium salt and a polymerizable monomer are added, the present invention makes use of the high cerium salt and the reductive organic group on the surface of the inorganic materials to constitute an oxidation-reduction initiation system, so as to initiate the monomer polymerization under the acidic condition, further to graft the polymer on the surface of the inorganic materials. The method of the present invention can graft the polymer on the surface of the inorganic materials easily, which has the advantages of simple reaction process, mild reaction condition and high grafting rate, so the present invention is particularly applicable for the grafting of a water-soluble polymer or a polymer hydrogel thin layer on the surface of the inorganic materials.

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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IPC IPC(8): C08F292/00
Inventor 彭懋王慧珺
Owner ZHEJIANG UNIV
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