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Preparation method of polymethyl methacrylate (PMMA) cellular gradient material

A polymethyl methacrylate, gradient material technology, applied in the field of gradient materials, can solve the problem of no polymer-based cell gradient material literature research report, etc., and achieve the effects of good dimensional stability, high mechanical properties, and simple process

Inactive Publication Date: 2012-04-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The novelty search results of domestic and foreign patents and literature show that there is no literature research report on the preparation of polymer-based cell gradient materials by supercritical carbon dioxide foaming technology.

Method used

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  • Preparation method of polymethyl methacrylate (PMMA) cellular gradient material
  • Preparation method of polymethyl methacrylate (PMMA) cellular gradient material
  • Preparation method of polymethyl methacrylate (PMMA) cellular gradient material

Examples

Experimental program
Comparison scheme
Effect test

specific example 1

[0026] 1. Fully dry the PMMA particles, melt and extrude them into a one-way open mold at 200°C, and then put the one-way open mold filled with polymer materials into the autoclave.

[0027] 2. Introduce a small amount of carbon dioxide to purge for 3 minutes, then raise the temperature of the autoclave to 50°C, then use a plunger pump to inject carbon dioxide to reach 28MPa, and saturate at constant temperature and pressure for 60 minutes to form a carbon dioxide / PMMA system with a concentration gradient.

[0028] 3. Quickly unscrew the pressure relief valve to release the pressure to normal pressure, then go to the heating device, put the autoclave into the ice-water mixture to cool down, and obtain the cell gradient material.

[0029] The cell structure of the cell gradient material is as follows figure 1As shown, better cell gradient structure can be obtained. The diffusion depth of supercritical carbon dioxide in the PMMA sample is 1386 μm, and a pore structure with smal...

specific example 2

[0031] 1. Fully dry the PMMA particles, melt and extrude them into a one-way open mold at 200°C, and then put the one-way open mold filled with polymer materials into the autoclave.

[0032] 2. Inject a small amount of carbon dioxide to purge for 3 minutes, then raise the temperature of the autoclave to 110°C, then use a plunger pump to inject carbon dioxide to 20MPa, and saturate at constant temperature and pressure for 10 minutes to form a carbon dioxide / PMMA system with a concentration gradient.

[0033] 3. Quickly unscrew the pressure relief valve to release the pressure to normal pressure, then remove the heating device, put the autoclave into the ice-water mixture to cool down, and obtain the cell gradient material.

[0034] The cell structure of the cell gradient material is as follows image 3 As shown, better cell gradient structure can be obtained. The diffusion depth of supercritical carbon dioxide in the PMMA sample is 1404 μm, and a pore structure with smaller di...

specific example 3

[0036] 1. Fully dry the PMMA particles, melt and extrude them into a one-way open mold at 200°C, and then put the one-way open mold filled with polymer materials into the autoclave.

[0037] 2. Inject a small amount of carbon dioxide to purge for 3 minutes, then raise the temperature of the autoclave to 140°C, then use a plunger pump to inject carbon dioxide to reach 28MPa, and saturate at constant temperature and pressure for 1 minute to form a carbon dioxide / PMMA system with a concentration gradient.

[0038] 3. Quickly unscrew the pressure relief valve to release the pressure to normal pressure, then remove the heating device, put the autoclave into the ice-water mixture to cool down, and obtain the cell gradient material.

[0039] The cell structure of the cell gradient material is as follows Figure 4 As shown, better cell gradient structure can be obtained. The diffusion depth of supercritical carbon dioxide in the PMMA sample is 1485 μm, and a pore structure with small...

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Abstract

The invention relates to a preparation method of a polymethyl methacrylate (PMMA) cellular gradient material. The method specifically comprises: placing a unidirectionally opened die loaded with PMMA into an autoclave, controlling the oriented adsorption of highpressure carbon dioxide in PMMA to form a concentration gradient, with the pressure of the carbon dioxide controlled at 10-30MPa and the temperature maintained at 50-150DEG C, preserving the heat and pressure for 1-60min, then conducting pressure releasing, and finally cooling a sample to room temperature with an ice-water mixture, thus obtaining the cellular gradient material. A cellular structure with a small cell diameter and a thin cell wall forms in a high concentration carbon dioxide diffusion area on the surface layer, a cellular structure with a large cell diameter and a thick cell wall forms in a low concentration area of the central section, and the innermost layer is compact PMMA matrixes. The porosity of the sample changes from high to low continuously from the surface layer to the inner layer. With a cell diameter controlled at micron magnitude, the gradient material provided in the invention has good dimensional stability, wide porosity variation range and high mechanical strength.

Description

technical field [0001] The invention relates to a gradient material, in particular to a preparation method of a polymethyl methacrylate (PMMA) cell gradient material. Background technique [0002] Gradient material refers to a new type of functional material in which the composition and structure of the material change continuously or stepwise from one orientation of the material to another orientation, so that the performance and function of the material also present a gradient change. Due to its excellent performance and the novel material design idea it embodies, once it is proposed, it immediately attracts the attention of material scientists from all over the world and conducts research on it. So far, some basic research methods have been explored. And prepared many systems of gradient functional materials. For example, Ti / Al, the earliest metal / oxide system studied 2 o 3 Gradient material, which continuously transitions from pure metallic Ti end to pure ceramic Al ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L33/12B29C44/60
Inventor 沈强熊远禄罗国强袁欢李美娟张联盟
Owner WUHAN UNIV OF TECH
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