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Anisotropic particle preparation method based on change of hydrophilicities of non-crosslinked seeds

An anisotropic and hydrophilic technology, applied in the field of synthesis of anisotropic asymmetric composite particles, can solve problems such as poor fluidity, and achieve the effect of simple and easy synthesis process, universality, and easy large-scale production

Active Publication Date: 2015-01-21
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problem of poor fluidity in the processing process caused by the complex synthesis process and high cross-linking of the current preparation of anisotropic composite particles, and provides a simple, environmentally friendly and easy-to-process preparation method

Method used

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  • Anisotropic particle preparation method based on change of hydrophilicities of non-crosslinked seeds
  • Anisotropic particle preparation method based on change of hydrophilicities of non-crosslinked seeds
  • Anisotropic particle preparation method based on change of hydrophilicities of non-crosslinked seeds

Examples

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Effect test

Embodiment example 1

[0030] Implementation Case 1 Preparation of Anisotropic PVC / PS Composite Particles

[0031] Preparation of seed emulsion:

[0032] Preparation of anisotropic particles:

[0033] Add 6.0g of hydrophilic monomer acetoacetoxyethyl methacrylate (AAEM), 600.0g of deionized water, and 0.72g of potassium persulfate to a 2L autoclave, seal the autoclave, and repeatedly vacuumize and fill it with nitrogen three times. Ensure that the atmosphere before the reaction is nitrogen, the pressure is normal pressure, start stirring, set the stirring speed to 300 rpm, add 60.0g of seed monomer vinyl chloride (VC) after stirring for 15 minutes, and quickly heat up to 55°C after stirring for 15 minutes Reaction temperature, when the pressure drops to 0.25MPa, the reaction is stopped, and the unreacted vinyl chloride monomer is removed under reduced pressure (vacuum degree is about 0.0995MPa), and the PVC seed emulsion is obtained. Immediately, the emulsion samples were taken directly, and t...

Embodiment example 2

[0041] The polymerization reaction time of implementation case 2 is 5 hours, and all the other implementation processes are the same as implementation case 1, and the SEM photograph of the composite particle form prepared by implementation case 2 is shown in the appendix Figure 5 , it can be seen that the composite latex particles present a uniform CH 4 Morphology of molecular configuration. The average size of the composite latex is 730nm, which is 388nm larger than the average particle size of PVC seeds which is 315nm.

[0042] Figure 6 It is the TEM photo of composite latex particles after staining and sectioning, in which the PS phase is easily replaced by O S o 4 The steam is dyed dark, and the PVC as a seed cannot be dyed. The internal morphology of the more complex composite latex particles can be observed through the TEM photo, and there is a pure PS phase ( Figure 6 d), there are also composite phases containing one, two, three PS protrusions ( Figure 6 a,b,c)...

Embodiment example 3-4

[0045] The polymerization reaction time of implementation case 3-4 is respectively 2h, 8h, and all the other implementation processes are the same as implementation case 1, and the SEM photograph of the composite particle form prepared by implementation case 3-4 is shown in the attachment Figure 7-8 .

[0046] Depend on Figure 7-8 It can be observed from SEM photos that when the polymerization time is 2 hours, there are one or two small protrusions and three or four large protrusions in the composite particles, and when the polymerization time is 8 hours, the protrusions are almost merged together. From the implementation cases 1-4, the PS protrusions of the PVC / PS composite particles prepared from the reaction time of 30 minutes to 8 hours gradually increased and the number gradually decreased. This is to stabilize the latex particles, and the small PS protrusions in the initial stage of the polymerization reaction are continuously merged. , which reduces the system free e...

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Abstract

The invention relates to an anisotropic particle preparation method based on change of hydrophilicities of non-crosslinked seeds. The method comprises the steps: firstly a series of polymer seeds having different surface hydrophilicities are prepared and then are swollen with monomers incompatible with the polymer seeds; according to different phase separation degrees of polymers which are induced by different interfacial tensions and incompatible with the seeds, the degree of phase separation is controlled, composite particles with controllable morphologies are obtained, and thus a series of anisotropic composite particles having different micro morphologies are successfully synthesized. The method adopts the soap-free emulsion polymerization, takes water as a reaction medium, is different from a conventional method adopting highly crosslinked seeds and various organic solvents as a dispersion phase, can prepare the non-crosslinked composite particles, and is conducive to separation and further processing. The synthesis process is simple and feasible, is clean and environmentally friendly, is easy for large-scale production, moreover, has universality, and is applicable to other polymer systems incompatible with each other.

Description

Technical field: [0001] The invention belongs to the synthesis of anisotropic asymmetric composite particles, in particular to a method for preparing anisotropic particles based on changing the hydrophilicity of non-crosslinked seeds. 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 method...

Claims

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Application Information

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IPC IPC(8): C08F112/08C08F120/44C08F212/14C08F214/06C08F226/06C08F220/28C08F220/32C08F220/18C08F212/08C08F214/22C08F218/08C08F220/06C08F220/34C08F2/22
Inventor 潘明旺牛群袁金凤刘晓张广林
Owner HEBEI UNIV OF TECH
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