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Monodisperse polystyrene microsphere, and preparation method and application thereof

A polystyrene microsphere, monodisperse technology, applied in the field of emulsion polymerization, can solve the problems of wide particle size distribution, precipitation, and poor storage stability of polymer emulsions, and achieve high production costs, good dispersion, and stable storage Effect

Active Publication Date: 2017-09-29
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, although this method effectively avoids the use of emulsifiers, the particle size distribution of the polymer emulsion prepared by this method is still wide, and the storage stability is very poor, and long-term storage will lead to a large amount of precipitation. production

Method used

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  • Monodisperse polystyrene microsphere, and preparation method and application thereof
  • Monodisperse polystyrene microsphere, and preparation method and application thereof
  • Monodisperse polystyrene microsphere, and preparation method and application thereof

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Embodiment 1

[0041] The method for preparing monodisperse polystyrene microspheres in this embodiment comprises the following steps:

[0042] Add 300 mg of N-isopropylacrylamide, 30 μL of 1-vinylimidazole, and 4 mL of styrene into 50 mL of deionized water, and blow nitrogen gas for 20 minutes while stirring, during which time the temperature is raised to 75°C. After stabilizing for 5 minutes at 75° C., 50 mg of azobisisobutylamidine hydrochloride was added to initiate polymerization. The stirring speed was maintained at 750-1250 rpm, and the reaction was carried out for at least 12 hours. The polystyrene microspheres prepared in this embodiment are as follows: figure 1 shown. Its monodispersity and storage stability are shown in Table 1.

Embodiment 2

[0044] The method for preparing monodisperse polystyrene microspheres in this embodiment comprises the following steps:

[0045] Add 300 mg of N-isopropylacrylamide, 100 μL of 4-vinylpyridine, and 12 mL of styrene into 100 mL of deionized water, and blow nitrogen gas for 20 minutes while stirring, during which time the temperature is raised to 70°C. After stabilizing for 5 minutes at 70° C., 120 mg of azobisisobutylamidine hydrochloride was added to initiate polymerization. The stirring speed was maintained at 750-1250 rpm, and the reaction was carried out for at least 24 hours. The polystyrene microspheres prepared in this embodiment are as follows: figure 2 shown. Its monodispersity and storage stability are shown in Table 1.

Embodiment 3

[0047] Add 300mg of N-isopropylacrylamide, 100μL of 2-vinylpyridine, and 12mL of styrene into 100mL of deionized water, blow nitrogen gas for 20 minutes while stirring, and raise the temperature to 70°C during this time. After stabilizing for 5 minutes at 70° C., 120 mg of azobisisobutylamidine hydrochloride was added to initiate polymerization. The stirring speed was maintained at 750-1250 rpm, and the reaction was carried out for at least 24 hours. The polystyrene microspheres prepared in this embodiment are as follows: image 3 shown. Its monodispersity and storage stability are shown in Table 1.

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Abstract

The invention relates to a monodisperse polystyrene microsphere, and a preparation method and application thereof. The polystyrene microsphere is prepared through soap-free emulsion polymerization with styrene as main monomers and N-isopropylacrylamide and vinylpyridine as comonomers, or with N-isopropylacrylamide and 1-vinyl imidazole as comonomers. The preparation method comprises the following steps: adding styrene and N-isopropylacrylamide into a reaction container filled with water; then adding vinylpyridine or 1-vinyl imidazole; introducing inert gas; carrying out heating to 60 to 85 DEG C and maintaining the temperature for 3 to 10 min; then adding an initiator according to the addition amount of styrene; and carrying out a reaction for 4 to 48 h. The monodisperse polystyrene microsphere provided by the invention can be used for preparation of emulsion paint, variable-color printing ink and photonic crystal devices. Compared with the prior art, the polystyrene microsphere provided by the invention has the advantage of good monodispersity; a photonic crystal film with a brilliant color can be prepared from the polystyrene microsphere without addition of other auxiliary agents; and the color of the photonic crystal film varies at different observation angles.

Description

technical field [0001] The invention belongs to the technical field of emulsion polymerization, and relates to a monodisperse polystyrene microsphere, a preparation method and application thereof. Background technique [0002] Emulsion polymerization is an important implementation method for the synthesis of polymer materials. Today, the method is quite mature, and the mechanism research is quite thorough. To put it simply, in this method, water is usually used as a medium, and a water-insoluble (or slightly water-soluble) polymerized monomer is used as a dispersed phase and dispersed in water under the action of an emulsifier. The function of the emulsifier is to disperse the oil-soluble monomer into nano-scale droplets or larger droplets. The emulsifier can form micelles in water, and the oil-soluble monomer exists inside the micelles (with a very small amount of The monomer is slightly soluble in water), which can play a role in stabilizing the nano-droplets. The subst...

Claims

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Application Information

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IPC IPC(8): C08F220/54C08F226/06C08F212/08C08F2/22B01J13/14C09D133/24C09D125/08C09D5/02C09D11/50C30B29/58
Inventor 朱新远陈蕊李蕊
Owner SHANGHAI JIAO TONG UNIV
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