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Method for grafting polymer on nano-grade SiO2 surface

A technology of surface grafting and water-soluble polymers, applied in the field of nano-SiO2 surface grafting, can solve the problems of difficult industrial production, complicated process, heavy pollution, etc., and achieve the effects of easy acquisition, simple operation process, and simple post-treatment

Inactive Publication Date: 2014-03-05
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the defects of complex process, heavy pollution and difficulty in realizing industrial production

Method used

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  • Method for grafting polymer on nano-grade SiO2 surface
  • Method for grafting polymer on nano-grade SiO2 surface
  • Method for grafting polymer on nano-grade SiO2 surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 0.005g CuSO 4 and 2.5g DMAAm were dispersed in 30g distilled water to make a reaction solution, and then 2.5g surface-fixed KH-550 nano-SiO 2 The powder was placed in the reaction solution and reacted at 80 °C for 6 h to prepare PDMAAm-grafted nano-SiO 2 The samples were analyzed by infrared spectroscopy, from Figure 9 It can be seen that at 2930cm -1 、1630cm -1 and 1410cm -1 Appears Nearby - CH 3 , C=O and C-N characteristic peaks, indicating that PDMAAm has been successfully grafted to nano-SiO 2 superior. Such as Figure 10 As shown, the weight loss rate of the sample in the range of 150°C to 600°C was 11.46%, and the grafting rate was 12.94g / 100g. Nano-SiO with KH-550 fixed on the surface 2 The powder has a weight loss rate of 3.104% in the range of 150°C to 600°C measured by thermogravimetric analysis (TGA).

Embodiment 2

[0046] 0.005g CuSO 4 and 2.5g NaAAc were dispersed in 30g distilled water to make a reaction solution, and then 5g surface-immobilized KH-550 nano-SiO 2 The powder was placed in the reaction solution and reacted at 80 °C for 4 h to prepare PNaAAc-grafted nano-SiO 2 The samples were analyzed by infrared spectroscopy, from Figure 11 It can be seen that at 1560cm -1 and 1430cm -1 Appear Nearby - COO - and -CH 2 -Characteristic peaks, indicating that PNaAAc has been successfully grafted to nano-SiO 2 superior. Such as Figure 12 As shown, the weight loss rate of the sample in the range of 150°C to 600°C is 13.56%, and the grafting rate is 15.69g / 100g.

Embodiment 3

[0048] 0.005g CuSO 4 Disperse 2.5g of AAm solid powder in 30g of distilled water to make a reaction solution, and then fix 2.5g of nano-SiO on the surface of KH-550 2 The powder was placed in the reaction solution and reacted at 80 °C for 6 h to prepare PAAm-grafted nano-SiO 2 The samples were analyzed by infrared spectroscopy, from Figure 13 It can be seen that at 1670cm -1 and 1430cm -1 The characteristic peaks of C=O and C-N appear nearby, indicating that PAAm has been successfully grafted to nano-SiO 2 superior. Such as Figure 14 As shown, the weight loss rate of the sample in the range of 150°C to 600°C is 21.20%, and the grafting rate is 26.90g / 100g.

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Abstract

The invention discloses a method for grafting a polymer on the surface of nano-grade SiO2. The method comprises the steps that: nano-grade SiO2 with a primary amine monomolecular layer fixed on the surface is added into a monomer aqueous solution containing a small amount of CuSO4; the mixture is subjected to a reaction for 4-6h under a temperature of 50-80 DEG C, such that a nano-grade SiO2 sample with a polymer fixed on the surface is obtained. The method provided by the invention is advantaged in simple operation process and substantial grafting effect. All the raw materials can be purchased from the market. No complicated purifying process is needed. The prices for the raw materials are low, and the materials are easy to obtain. Water is adopted as a reaction medium, such that complicated post solvent recovering processes are avoided. The cost is reduced, and the pollution to the environment is relatively low. The grafted SiO2 can be used for improving the dispersity thereof in an aqueous solution, and can be used for improving the performance of a composite material. The grafted SiO2 has a good industrialization application prospect.

Description

technical field [0001] The invention belongs to nano SiO 2 Modification technical field, relate to a kind of nanometer SiO 2 The method of surface grafting, especially related to the nano-SiO 2 A method for grafting polymers to surfaces via redox-initiated free-radical polymerization. Background technique [0002] In recent years, organic-inorganic nanocomposites have become one of the hotspots in material science because of their superior physical and chemical properties, especially in material mechanics and optics. For organic-inorganic nanocomposites, nano-SiO 2 Simple synthesis, low price, large specific surface area and easy surface modification, nano-SiO 2 The surface-grafted polymer can endow it with good colloidal stability, biocompatibility, processability and environmental responsiveness. Therefore, in nano-SiO 2 Grafting polymers on the surface to prepare organic-inorganic nanocomposites has become one of the key research directions of scholars at home and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F292/00C08F4/40
Inventor 陈肖博周永生翟光群
Owner CHANGZHOU UNIV
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