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Preparation method of poly (9, 9-di-n-octylfluorenyl-2, 7-diyl) nanoparticles

An n-octylfluorene-based and nanoparticle technology is applied in the field of preparation of organic functional small molecule semiconductor single crystal materials, which can solve the problems that the morphology and size of aggregates are not easy to control, limit the application of PFO nanoparticles, and the like, and achieve a β-phase content. Adjustable, reduced manufacturing cost, and controllable size

Active Publication Date: 2022-05-27
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, with the help of volatile solvent annealing, the β phase content in the PFO film will also be greatly increased
However, the above two preparation methods are only suitable for the regulation of β-phase content in PFO films, but not for PFO nanoparticles, which greatly limits the application of PFO nanoparticles.
In addition to being formed in thin films, PFO can also be formed directly in solution, but the morphology and size of its aggregates are not easy to control

Method used

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  • Preparation method of poly (9, 9-di-n-octylfluorenyl-2, 7-diyl) nanoparticles
  • Preparation method of poly (9, 9-di-n-octylfluorenyl-2, 7-diyl) nanoparticles
  • Preparation method of poly (9, 9-di-n-octylfluorenyl-2, 7-diyl) nanoparticles

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Experimental program
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Effect test

Embodiment 1

[0047] Preparation of poly(9,9-di-n-octylfluorenyl-2,7-diyl) nanoparticles:

[0048] (1) Dissolve 15mg PFO (Mw=86kg / mol) and 15mg PS (Mw=90kg / mol) in 5mL chloroform, and mix well to obtain a polymer solution with a concentration of 6mg / mL;

[0049] (2) 15 mg of SDS was dissolved in 10 mL of deionized water, and mixed evenly to obtain an SDS aqueous solution with a concentration of 1.5 mg / mL;

[0050] (3) Mix the polymer solution obtained in step (1) with the SDS aqueous solution in step (2), and stir at a stirring speed of 1250 rpm for 1 h to obtain a polymer microemulsion; the volume ratio of the polymer solution to the SDS aqueous solution is 5:10;

[0051](4) The microemulsion obtained in step (3) was subjected to the microemulsion using a Branson W450-D sonicator equipped with a 1 / 2" tip in a pulsed state (30 sec sonication, 10 sec pause) under an ice bath for 5 min Ultrasonic treatment of 70% amplitude to form droplets of oil-in-water emulsion;

[0052] (5) The polymer...

Embodiment 2

[0055] With the preparation method of poly(9,9-di-n-octylfluorenyl-2,7-diyl) nanoparticles described in Example 1, the difference is:

[0056] In step (1), Mw of PS=1000 g / mol.

[0057] The β-phase content in the nanoparticles (PFO / PS-1k) produced in this example was 17.1% (see Figure 4 ), and the particle size of the nanoparticles is 82 nm.

Embodiment 3

[0059] With the preparation method of poly(9,9-di-n-octylfluorenyl-2,7-diyl) nanoparticles described in Example 1, the difference is:

[0060] In step (1), Mw of PS=20kg / mol.

[0061] The β-phase content in the nanoparticles (PFO / PS-20k) produced in this example was 18.9% (see Figure 4 ), the particle size of the nanoparticles is 65 nm.

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Abstract

The invention relates to a preparation method of poly (9, 9-di-n-octylfluorenyl-2, 7-diyl) nanoparticles, which comprises the following steps: forming oil-in-water micro-emulsion drops through ultrasonic blending between a polymer solution and an SDS (Sodium Dodecyl Sulfate) aqueous solution, then evaporating an organic solvent in the emulsion drops, and preparing the poly (9, 9-di-n-octylfluorenyl-2, 7-diyl) nanoparticles by reducing the evaporation time of the solvent, thereby obtaining the poly (9, 9-di-n-octylfluorenyl-2, 7-diyl) nanoparticles. The self-assembly time of PFO molecules in emulsion droplets is prolonged, the PFO nano-particles are prepared, and the beta-phase content of PFO in the nano-particles is increased. The method is easy and convenient to operate, expensive instruments are not needed, vacuumizing and heating processes are not needed, the PFO nano-particles can be prepared at normal temperature and normal pressure, the preparation cost is reduced, and the technological process is shortened. The utilization rate of raw materials is high, and the yield of the nanoparticles is 98% or above. In addition, the prepared nano-particles are controllable in size, and the beta-phase content of the PFO nano-particles can be regulated and controlled.

Description

technical field [0001] The invention relates to a preparation method of poly(9,9-di-n-octylfluorenyl-2,7-diyl) nanoparticles, and belongs to the technical field of preparation of organic functional small molecule semiconductor single crystal materials. Background technique [0002] Conjugated semiconducting polymers have attracted great attention due to their great potential in optoelectronic applications, such as in organic light-emitting diodes (OLEDs), solar cells, and low-threshold lasers. Poly(9,9-di-n-octylfluorenyl-2,7-diyl) (PFO) is a commonly used blue-emitting semiconducting polymer. The polymer has a variety of phases, including semi-crystalline alpha and alpha' phases, metastable beta, nematic, amorphous, and gamma phases. Compared with the other amorphous phases described above, the β phase has a lower band gap due to an increase in the conjugation length of the PFO segment. Therefore, β-phase PFO can form a highly ordered path of charge carriers in the conjug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08J3/16C08L65/00C08L25/06
CPCC08J3/12C08J3/16C08J2365/00C08J2325/06Y02E10/549
Inventor 赵兴娟贾曰辰
Owner SHANDONG JIANZHU UNIV
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