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Method of preparing line type polyolefin cellular material

A linear polyolefin and porous material technology, applied in the field of linear olefin polymer porous materials, can solve the problems of difficulty in obtaining bulk porous polymer materials and narrow technical application areas, achieving unlimited shape, simple preparation and molding technology, Versatile effect

Inactive Publication Date: 2009-12-23
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the free radical polymerization that can prepare porous materials is mainly suspension polymerization, but suspension polymerization generally only obtains granular products, the so-called porous microspheres, and it is difficult to obtain integral continuous block porous polymer materials. Other methods For example, the phase separation method and the stretching method are to make the existing polymer into a porous film by physical means, and although the micro-foaming technology can obtain a block of porous material, it needs to rely on a special physical process (such as supercritical carbon dioxide gasification process), the technical application area is relatively narrow
Overall, the field lacks a convenient and flexible method to prepare monolithic continuous bulk porous polymer materials

Method used

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  • Method of preparing line type polyolefin cellular material
  • Method of preparing line type polyolefin cellular material
  • Method of preparing line type polyolefin cellular material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Slowly add the olefinic monomer containing the initiator: 10 grams of styrene (S) is dissolved in 30 grams of polyethylene glycol 1000 and 10 grams of dioxane medium to obtain a clear solution, and react and polymerize at 60 ° C for at least 6 hours , the viscosity of the solution increases continuously, and then phase separation gradually occurs. During the phase separation, the system gradually turns milky white, and finally condenses into a jelly-like block. Put it into water, dissolve and remove polyethylene glycol, etc., to obtain a linear Polyolefin porous material. In the polymerization process, if the decomposition activation energy of the initiator is too high or the half-life is too long, the decomposition rate will be too low, which will prolong the polymerization time. However, if the activation energy is too low or the half-life is too short, the initiation is too fast, the temperature is difficult to control, and implosion may be caused; or the initiator d...

Embodiment 2～4

[0032] Slowly add the olefinic monomer containing initiator dibenzoyl peroxide (BPO): 10 grams of styrene (S) are dissolved in 30 grams of polyethylene glycol 1000 and dioxane mixed medium to obtain a clear solution. 60 ℃ constant temperature reaction polymerization for at least 6 hours, the viscosity of the solution increases continuously, then phase separation gradually occurs, forming a white gel, and finally solidifies into a block, put the solid into water, dissolve and remove polyethylene glycol, etc., to obtain a linear Polyolefin porous material. The weights of dioxane were 6 grams, 8 grams, and 12 grams respectively. The rest of the conditions and operations were the same as those in Example 1, and the corresponding linear polyolefin porous materials were prepared. The pore diameters are shown in Table 1.

[0033] Table 1:

[0034] Example 1

Embodiment 5

[0036]Slowly add olefinic monomers containing initiator azobisisobutyronitrile (AIBN): 10 grams of acrylonitrile (AN) dissolved in 30 grams of polyethylene glycol 1000 and 8 grams of dimethylformamide (DMF) medium, Obtain a clear solution, react and polymerize at a constant temperature of 65°C for at least 6 hours, the viscosity of the solution increases continuously, then phase separation gradually occurs, forming a white gel, and finally solidifies into a block, put the solid into water, dissolve and remove polyethylene glycol etc. to obtain linear polyolefin porous materials. The average pore diameter is 0.45 μm.

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Abstract

The invention relates to a preparation method of a linear polyolefin porous material. Polymerization monomers use olefin monomers, such as acrylates, styrene, acrylonitrile, vinyl acetate and functional monomers, in a mixed solvent composed of polyethylene glycol or a suitable solvent (or precipitant) Dissolve in medium, carry out free radical polymerization in azo and peroxy organic initiators, suitable temperature and atmosphere, but different from solution polymerization and precipitation polymerization, there is a characteristic that the polymerization reaction promotes phase separation, and finally solidifies into Block, remove polyethylene glycol, etc., to obtain a linear polyolefin porous material. The prepared polymer porous material is integrally continuous, the pore structure is an open and connected channel, the average pore diameter is in the order of micron to nanometer, and the size of the pore structure can be regulated by polyethylene glycol (PEG) and a mixed medium. Chemical modification of pores can be widely used in separation, filtration, adsorption, chelation and intelligent membrane materials in instrument analysis, water treatment, biomedicine and other industries.

Description

technical field [0001] The present invention relates to a method for linear olefin polymer porous materials. Background technique [0002] In recent years, the preparation technology of polymer porous materials has been developed rapidly, and a variety of molding processes and methods that can produce tiny pores in the polymer matrix have been developed, such as phase separation method, stretching method, nuclear track method, sintering method, etc. method, thermal decomposition method, suspension polymerization method, macromolecular structure template method, colloidal crystal template method, micro-foaming technology, etc. The materials prepared by these methods are very important in many fields due to their porous structure with large specific surface area. Its application value, including insulation materials, packaging materials, adsorption materials, controlled release materials, human bone substitute materials, chromatographic monolithic column materials, etc., has b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F2/06C08F2/38C08J9/00
Inventor 张瑞丰肖通虎
Owner NINGBO UNIV
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