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Crosslinked core-shell structure nano-polymer microsphere and its preparation method

A technology of nano-polymer and core-shell structure is applied in the field of cross-linked core-shell structure nano-polymer microspheres and its preparation field, which can solve the problems of poor solvent resistance and oil absorption, and achieves simple preparation process, easy storage and high performance. effect used

Inactive Publication Date: 2005-05-25
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a cross-linked core-shell nano-polymer microsphere and its preparation method. On the one hand, the method reduces the size of the previous polymer core-shell particles to the nanoscale range, and at the same time makes the core and shell of the product A cross-linked structure is formed inside, which not only solves the problem of preparing nanoscale core-shell latex particles, but also solves the problems of poor solvent resistance and oil absorption of core-shell latex particles in the past, and can finally be shown in practical applications. various good properties

Method used

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  • Crosslinked core-shell structure nano-polymer microsphere and its preparation method
  • Crosslinked core-shell structure nano-polymer microsphere and its preparation method
  • Crosslinked core-shell structure nano-polymer microsphere and its preparation method

Examples

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Embodiment 1

[0047] Example 1: 70 parts of butyl acrylate (BA) as the core layer monoolefin monomer and 7 parts of trimethylolpropane trimethacrylate (TM) as the core layer polyolefin monomer were mixed uniformly and set aside. Add 360 parts of deionized water, 4 parts of sodium dodecylsulfonate (SDS) and 0.5 part of nonylphenol polyoxyethylene ether into a four-necked bottle equipped with mechanical stirring, reflux condenser and thermometer, and raise the temperature to 50°C , add 30% of the previously prepared mixture to form a uniform emulsion. Then add 80% of the initiator aqueous solution made up of 0.5 parts of water-soluble initiator ammonium persulfate and 72 parts of deionized water, and raise the temperature to 82° C. for 1.5 hours. Then, dropwise add the remaining previously prepared mixture to the system, and react for 1.5 hours after the dropwise addition is completed. Then add the remaining initiator solution, and dropwise add 30 parts of methyl methacrylate (MMA) (as shell...

Embodiment 2

[0048] Example 2: 30 parts of styrene (St) as the core layer monoolefin monomer and 3 parts of divinylbenzene (DVB) as the core layer polyolefin monomer were mixed uniformly and set aside. Add 360 parts of deionized water, 6.5 parts of sodium dodecylsulfonate (SDS) and 0.5 part of nonylphenol polyoxyethylene ether into a four-necked bottle equipped with mechanical stirring, reflux condenser and thermometer, and raise the temperature to 50°C , add 70% of the previously prepared mixture to form a uniform emulsion. Then add 20% of the initiator aqueous solution made up of 0.5 parts of water-soluble initiator ammonium persulfate and 72 parts of deionized water, and raise the temperature to 82° C. for 40 minutes. Then the rest of the previously prepared mixture was added to the system, and the reaction was continued for 1 hour. Then add all the remaining initiator solution, and add 70 parts of butyl acrylate (BA) (as the shell monoolefin monomer) and 7 parts of divinylbenzene (DVB...

Embodiment 3

[0049] Embodiment 3: the core layer monoolefin monomer in embodiment 1 is changed into the mixture of butyl acrylate and methyl acrylate of equal mass, and the shell layer monoolefin monomer is changed into the mixture of St and MMA, wherein MMA and St Mass ratio is 2: 1, all the other formulations are identical with example 1. The performance index of the obtained product is shown in Table 1.

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Abstract

The invention relates to a cross-linked core-shell structure nano polymer microsphere and a preparation method thereof, belonging to the technical field of polymer materials. The present invention uses a variety of organic olefin monomers as raw materials, and is prepared by emulsion or suspension polymerization with water as the medium under the condition of the presence of emulsifiers and initiators; the product has a core-shell structure, and both the inside of the core and the inside of the shell present Linked, the core and the shell are connected by chemical bonds, and the particle size is less than 100nm. In the present invention, by changing the composition and structure of the core and the shell, a variety of soft-core hard-shell or hard-core soft-shell nano-polymer microspheres with different physical and chemical properties are obtained, which has a high degree of freedom in the choice of structure design. The invention not only solves the problem that the core-shell polymer microspheres do not have a nanometer scale, but also solves the problem that the core and the shell are mostly linear polymers in the past, so that it has wider application prospects in the field of nanotechnology.

Description

technical field [0001] The invention relates to a nano-polymer microsphere with a cross-linked core-shell structure and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] The preparation of polymer microspheres with core-shell structure has attracted more and more researchers' attention in recent years. Polymers polymerized from polymerizable monomers of different components can act as core or shell components in core-shell microspheres. Using the different properties of these polymers, soft-core hard shells or hard cores with different physical and chemical properties can be synthesized. Soft-shell nano-polymer microspheres. At the same time, this synthesis embodies the concept of molecular design. Not only the components of the core and shell can be changed according to the needs, but also the scale can be controlled by corresponding methods to achieve the purpose of application. It is the diversity of compo...

Claims

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Application Information

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IPC IPC(8): C08F2/16C08F12/08C08F20/10
Inventor 于建曾重郭朝霞
Owner TSINGHUA UNIV
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