Preparation method of asymmetric particles based on swelling seed emulsion polymerization

An asymmetric particle and emulsion polymerization technology, which is applied in the field of synthesis of non-spherical asymmetric composite particles, can solve the problem of single shape of composite particles

Inactive Publication Date: 2014-01-29
TIANJIN QUANDA TECH
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  • Abstract
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Problems solved by technology

[0005] The present invention aims at the complex synthesis process of asymmetric particles prepared by the seed swelling polymerization method and the problem that the obtained composite particles have a single shape, and provides a simple, environmentally friendly and effective preparation method

Method used

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  • Preparation method of asymmetric particles based on swelling seed emulsion polymerization
  • Preparation method of asymmetric particles based on swelling seed emulsion polymerization
  • Preparation method of asymmetric particles based on swelling seed emulsion polymerization

Examples

Experimental program
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Embodiment example 1

[0021]

[0022] According to the above ratio, add a certain amount of seed monomer styrene (St) (3.0g), cross-linking agent divinylbenzene (DVB) (0.06g), 80.0g deionized water into the four-necked flask, start stirring In the whole process, feed nitrogen, reflux and condense. After the system reaches the reaction temperature of 70°C, add 0.024 g of initiator potassium persulfate, and polymerize for 5 hours to obtain the seed emulsion;

[0023] Add deionized water to 25.0g of seed emulsion (containing about 1.0g of PS seeds), ultrasonically disperse, add 3.0g of the second monomer methyl methacrylate (MMA) at one time, start stirring, swell at room temperature for 30min, then heat up, wait for the system After reaching the reaction temperature of 70°C, 0.018 g of initiator potassium persulfate was added. During the whole process, nitrogen gas was introduced, refluxed and condensed, and polymerized for 5 hours, and then the emulsion sample was directly taken from the reaction ...

Embodiment example 2

[0026] In the implementation case 2, the amount of the cross-linking agent DVB was changed to 0.12 g, and the rest of the implementation process was the same as the implementation case 1.

Embodiment example 3

[0028] In Embodiment 3, the amount of the cross-linking agent DVB was changed to 0.015 g, and the rest of the implementation process was the same as Embodiment 1.

[0029] Comparing the three implementation cases, it can be seen that increasing the cross-linking degree of the seeds is conducive to the occurrence of phase separation. By controlling the amount of cross-linking agent in the seeds, the morphology of the composite particles can be controlled, thereby preparing non- symmetrical particles.

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Abstract

The invention relates to a preparation method of asymmetric particles based on swelling seed emulsion polymerization. The method comprises: firstly, preparing a series of seeds with different degrees of crosslinking, and then, respectively swelling the seeds through a second monomer for polymerization. Since phase separation degrees controlled by different degrees of crosslinking are different, the feeding dosage of the second monomer is isomorphically adjusted and the reaction time is controlled to prepare asymmetric composite particles. The forms of the composite particles prepared by the method are controllable, the composite particles are easy to separate and treat, and meanwhile, the composite particles have the properties of two polymers, are capable of being used as bulking agent between incompatible polymer blends, and the like. The synthesis process is simple, convenient and feasible, and the system contains no emulsifier, thereby being clean and easy to realize large scale production, and having environmental-friendly effect.

Description

technical field [0001] The invention belongs to the synthesis of non-spherical asymmetric composite particles, in particular to a preparation method of asymmetric particles based on swelling seed emulsion polymerization. technical background [0002] Anisotropic composite particles generally refer to particles with asymmetric shape, chemical composition and / or performance, and non-uniform distribution, also known as Janus particles or asymmetric particles. 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, topological selective surface modification, template self-assembly, controllable surface nucleation, swelling seed swelling polymerization, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F212/12C08F220/14C08F220/44C08F212/36C08F222/14C08F218/18C08F2/22
Inventor 赫川牛群李玉丹
Owner TIANJIN QUANDA TECH
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