A method for preparing non-spherical particles based on changing seed hydrophilicity and cross-linking degree

A non-spherical, hydrophilic technology, applied in the field of synthesis of anisotropic non-spherical composite particles, can solve the problem of single shape of composite particles

Active Publication Date: 2018-07-31
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a simple, environmentally friendly and effective preparation method for the complex synthesis process of the current non-spherical particle preparation and the single shape of the obtained composite particle.

Method used

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  • A method for preparing non-spherical particles based on changing seed hydrophilicity and cross-linking degree
  • A method for preparing non-spherical particles based on changing seed hydrophilicity and cross-linking degree
  • A method for preparing non-spherical particles based on changing seed hydrophilicity and cross-linking degree

Examples

Experimental program
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Effect test

Embodiment example 1

[0031]

[0032] According to the above ratio, a certain amount of seed monomer methyl methacrylate (3.0g), hydrophilic monomer acetoacetoxy ethyl methacrylate (AAEM) (0.3g), crosslinking agent dimethacrylic acid Add ethylene glycol ester (EGDMA) (0.12g) and 80.0g deionized water into the four-necked flask, start stirring, and pass nitrogen gas into the whole process, reflux and condense, and add the initiator potassium persulfate 0.024 after the system reaches the reaction temperature of 65°C g, polymerized for 5 hours to obtain the seed emulsion;

[0033] Add deionized water to 25.0g seed emulsion (containing about 1.0g PMMA seeds), ultrasonically disperse, add 4.0g of the second monomer styrene at one time, start stirring, heat up after swelling for 30min, and wait until the system reaches the reaction temperature of 70°C Add initiator potassium persulfate 0.032g, feed nitrogen into the whole process, reflux and condense, polymerize for 5 hours, then directly extract the ...

Embodiment example 2

[0039] In implementation case 2, the amount of changing the hydrophilic monomer AAEM is 0.12g, and all the other implementation processes are the same as implementation case 1, and the SEM photo of the composite particle form prepared by implementation case 2 is shown in the appendix image 3 , see attached TEM photo Figure 4 .

Embodiment example 3

[0041] In the implementation case 3, the amount of the hydrophilic monomer AAEM was changed to 0.45 g, and the rest of the implementation process was the same as the implementation case 1.

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Abstract

The present invention is based on a method for preparing non-spherical particles by changing the hydrophilicity and crosslinking degree of seeds. This method first prepares a series of polymer seeds with different surface hydrophilicity and crosslinking degrees, and then is compared with them. Compatible monomers swell, different interfacial tensions induce different degrees of phase separation with their incompatible polymers, and the new polymer phase separates from the seeds under the joint action of interfacial tension and crosslinked seed elasticity , as a result, a series of non-spherical composite particles with different microscopic morphologies were successfully synthesized. The method of the invention adopts soap-free emulsion polymerization, uses water as a dispersed phase, can prepare non-spherical composite particles of different shapes, and is easy to separate and handle. The synthesis process is simple and easy, clean and environmentally friendly, easy for large-scale production, and has versatility, and is applicable to other polymer systems that are incompatible with each other.

Description

Technical field: [0001] The invention belongs to the synthesis of anisotropic non-spherical composite particles, specifically a method for preparing non-spherical particles based on changing seed hydrophilicity and cross-linking degree. technical background: [0002] Anisotropic composite particles generally refer to particles with asymmetric shape, chemical composition and / or properties, and non-uniform distribution. Such particles have shown attractive application prospects in molecular recognition and self-assembly, photobiosensors, interface modification, electronic paper, anisotropic imaging probes, solar energy conversion, surfactants, etc. people's attention. The main preparation methods of anisotropic composite particles commonly reported in the literature include: microfluidic synthesis, topologically selective surface modification, template self-assembly, controllable phase separation, and controllable surface nucleation. [0003] At present, the preparation meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/08C08F220/14C08F220/28C08F220/18C08F222/14C08F212/36C08F220/32C08F220/44C08F226/06C08F214/06
Inventor 潘明旺牛群刘晓袁金凤张广林王璐
Owner HEBEI UNIV OF TECH
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