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Preparation method of form-adjustable anisotropic asymmetric emulsion particles

An anisotropic and asymmetric technology, applied in the field of synthesis of anisotropic asymmetric composite particles, can solve problems such as poor fluidity, inability to distinguish polymer surface protrusions from seeds, uncontrollable molecular weight and its distribution, etc., to achieve Ease of large-scale production and simple process

Inactive Publication Date: 2015-06-03
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention is aimed at the complex synthesis process for the preparation of current anisotropic asymmetric particles, the poor fluidity in the processing process caused by high crosslinking, the uncontrollable molecular weight and its distribution in the free radical polymerization process, and the inability of polymer surface protrusions and seeds. A series of problems such as good distinction, providing a simple, environmentally friendly and energy-saving preparation method

Method used

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  • Preparation method of form-adjustable anisotropic asymmetric emulsion particles
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  • Preparation method of form-adjustable anisotropic asymmetric emulsion particles

Examples

Experimental program
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Embodiment example 1

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

[0031]

[0032] Add 6.67g of PVDF seed emulsion (industrial product) with a solid content of 15% and an average particle diameter of 180nm in a 100ml four-necked bottle equipped with mechanical stirring, reflux condenser and nitrogen inlet, ultrasonically disperse for 40 minutes, and add the monomer Styrene and initiator 2-bromopropionate methyl ester, simultaneously start stirring and feed nitrogen continuously, and the stirring rate is set at 250 rev / min. After 1.5 hours, add 0.14g of the ligand pentamethyldivinyltriamine and 0.13g of copper wire with a diameter of 1mm as the catalyst, and simultaneously perform vacuum pumping-nitrogen operation, and take samples every 1 hour to measure the molecular weight and its distribution. and distribution map attached image 3 shown, and then polymerized at a reaction temperature of 25°C for 5 hours. The emulsion samples were directly drawn from...

Embodiment example 2-3

[0039] The polymerization reaction time of implementation case 2-3 is 1 hour, 3 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 2-3 is shown in the attachment Figure 4-5 .

[0040] attached by figure 1 , 3 4. It can be seen that the particle size of the asymmetric composite particles gradually increases and the surface protrusions gradually decrease with the prolongation of the polymerization time.

Embodiment example 4

[0042] In embodiment case 4, the add-on of changing monomer styrene is 0.5g, and the add-on of initiator 2-bromopropionate methyl ester is 0.008g, and the add-on of ligand pentamethyldivinyltriamine is 0.005g, and the catalyst The addition of the copper wire of diameter 1mm is 0.043g, 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 4 is shown in the appendix Image 6 .

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Abstract

The invention discloses a preparation method of form-adjustable anisotropic asymmetric emulsion particles. The method comprises steps as follows: adding a PVDF (polyvinylidene fluoride) seed emulsion to a reaction container equipped with a mechanical stirring and reflux condensing tube and a nitrogen introduction port, performing ultrasonic dispersion for 40 min, adding monomers and an initiator, meanwhile, starting stirring, continuously feeding nitrogen, adding ligands and a catalyst after 1.5 h, performing vacuum pumping and nitrogen feeding operations simultaneously, and then performing polymerization at the reaction temperature of 20-50 DEG C for 1-7 h; then performing decompression and low-temperature drying on the emulsion until the emulsion is constant in weight so as to prepare the anisotropic asymmetric emulsion particles. The catalyst is metallic copper. According to the method, the anisotropic asymmetric particles are successfully prepared through seed emulsion polymerization and SET-LRP (single electron transfer-living radical polymerization), and forms and sizes of the emulsion particles can be effectively controlled through selection of different seed monomer mass ratios, polymerization reaction temperatures and catalyst sizes.

Description

Technical field: [0001] The invention belongs to the synthesis of anisotropic asymmetric composite particles, in particular to a method for preparing anisotropic asymmetric latex particles with adjustable shape. In the method, polyvinylidene fluoride (PVDF) emulsion is used as a seed, and non-soap seed emulsion polymerization is carried out with its incompatible polymer monomer, so as to prepare anisotropic asymmetric latex particles with adjustable morphology. technical background: [0002] Anisotropic asymmetric particles refer to anisotropic particles whose two hemispherical surfaces have two different chemical compositions or properties. Such particles have broad application prospects in the fields of emulsion stabilization, drug delivery, chemical catalysis, photobiosensors, electronic display, and self-assembly of advanced functional materials, thus arousing strong research interest. There are also many preparation methods, and the preparation methods of anisotropic p...

Claims

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Application Information

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IPC IPC(8): C08F214/22C08F212/08C08F212/14C08F212/12C08F220/14C08F220/18C08F220/44C08F2/22
Inventor 潘明旺王丽霞袁金凤王文杰常燕宁张广林
Owner HEBEI UNIV OF TECH
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