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Emulsion polymerizing preparation method of polyethylene/silicon dioxide core-shell structure composite material

A technology of silicon dioxide and composite materials, applied in the field of composite materials, can solve the problems of weak chemical action, unable to obtain polyethylene/silica shell-core structure composite materials, unstable nanoparticles, etc., and achieve the effect of high surface area

Inactive Publication Date: 2009-06-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is to mix the catalyst and nano-silica, emulsify in water, and then polymerize to obtain a very good nanocomposite material in which silica nanoparticles are dispersed in polyethylene. Silicon nanoparticles and polyethylene molecules have physical interaction or weak chemical interaction. Nanoparticles are not stable in polyethylene. When the material is thermally processed, nanoparticles are also easy to reunite and undergo macroscopic phase separation from the polyethylene matrix.
[0004] In conclusion, none of the reported preparation methods of polyethylene / silica composites can obtain polyethylene / silica core-shell composites in the molten state of polyethylene.

Method used

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  • Emulsion polymerizing preparation method of polyethylene/silicon dioxide core-shell structure composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 0.1 g of vinyl-functionalized mesoporous silica nanoparticles with 0.1 mmol of bis-(cyclooctyl-1,5-diene)nickel and 0.1 mmol of ethyl 4,4,4-trifluoro-2- (Triphenylphosphine ylide)-acetyl ethyl ester mixed;

[0023] Add 0.5 ml of toluene, stir for 20 minutes, and disperse in 100 ml of water;

[0024] Add 1 gram of sodium lauryl sulfate and sonicate for 1 minute;

[0025] The dispersed emulsion was transferred to an autoclave, and ethylene gas was introduced into it. The ethylene gas was maintained at a pressure of 50 atmospheres, and the temperature was raised to 60 degrees Celsius, stirred, and reacted for 2 hours to obtain a polyethylene / silicon dioxide emulsion. After the polyethylene / silicon dioxide emulsion is dried, it is annealed at 130 degrees centigrade to obtain a polyethylene / silicon dioxide shell-core composite material with an inorganic component content of 1.2%.

Embodiment 2

[0027] Take 0.2 g of vinyl-functionalized mesoporous silica nanoparticles with 0.3 mmol of bis-(cyclooctyl-1,5-diene)nickel and 0.3 mmol of ethyl 4,4,4-trifluoro-2- (Triphenylphosphine ylide)-acetyl ethyl ester mixed;

[0028] Add 2 ml of toluene, stir for 20 minutes, and disperse in 400 ml of water;

[0029] Add 1 gram of sodium lauryl sulfate and 1 gram of dodecyltrimethylammonium chloride, and sonicate for 2 minutes;

[0030] The dispersed emulsion was transferred to an autoclave, and ethylene gas was introduced into it. The ethylene gas was maintained at a pressure of 10 atmospheres, the temperature was raised to 70 degrees Celsius, stirred, and reacted for 3 hours to obtain a polyethylene / silicon dioxide emulsion. After the polyethylene / silicon dioxide emulsion is dried, it is annealed at 130 degrees centigrade to obtain a polyethylene / silicon dioxide shell-core composite material with an inorganic component content of 2.8%.

Embodiment 3

[0032] Take 0.4 g of vinyl-functionalized mesoporous silica nanoparticles with 0.5 mmol of bis-(cyclooctyl-1,5-diene)nickel and 0.5 mmol of ethyl 4,4,4-trifluoro-2- (Triphenylphosphine ylide)-acetyl ethyl ester mixed;

[0033] Add 4 ml of benzene, stir for 20 minutes, and disperse in 1000 ml of water;

[0034] Add 2 grams of sodium lauryl sulfate and 2 grams of cetyltrimethylammonium bromide, and sonicate for 3 minutes;

[0035] The dispersed emulsion was transferred to an autoclave, and ethylene gas was introduced into it. The ethylene gas was maintained at a pressure of 30 atmospheres, the temperature was raised to 50 degrees Celsius, stirred, and reacted for 4 hours to obtain a polyethylene / silicon dioxide emulsion. After the polyethylene / silicon dioxide emulsion is dried, it is annealed at 130 degrees centigrade to obtain a polyethylene / silicon dioxide shell-core composite material with an inorganic component content of 1.6%.

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Abstract

The invention relates to an emulsion polymerizing preparation method of polyethylene / silicon dioxide core-shell structure composite material in the technical field of composite materials. The method is that: bis-(1, 5-cyclooctadiene) nickel and ethyl 4,4,4-trifluoro-2-(triphenylphosphine ylide)-acetoacetic ester is dissolved in toluol or benzene, and then is stirred, thus obtaining ethylene polymerization catalyst. A supported catalyst is obtained by mixing the ethylene polymerization catalyst and middle-hole silicon dioxide nano granules functionalized by ethylene; by dispersing the supported catalyst in water, adding a surface active agent and carrying out an ultrasonic treatment, stable emulsion is obtained; at last, polyethylene / silicon dioxide emulsion is obtained by inputting the ethylene, increasing the temperature and polymerizing. After drying the emulsion, the annealing is carried out above the fusion temperature of the polyethylene, thus obtaining the polyethylene / silicon dioxide core-shell structure composite material. The composite material not only can be independently used as material, but also can be used as additives of other polymer nano-composite materials.

Description

technical field [0001] The invention relates to a preparation method in the technical field of composite materials, in particular to a method for preparing polyethylene / silicon dioxide core-shell structure composite materials by emulsion polymerization. Background technique [0002] Polyethylene is the most widely used polymer material, and its high performance can be endowed with properties that the material itself does not have, which can broaden its application range and have important application value; silica nanoparticles are the most common inorganic nanomaterials, It is cheap and easy to obtain, and can be used in polymer modification on a large scale. The composite of polyethylene and silica nanoparticles has practical significance. In the composite matrix, the interaction between inorganic nanoparticles and polymers is closely related to the final properties of nanocomposites. In the composite material system, the ideal situation is that polyethylene is closely co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F2/24C08F4/80C08F4/02
Inventor 魏良明张亚非
Owner SHANGHAI JIAO TONG UNIV
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