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Poly phenylenevinylene conjugated polymer fluorescent nanoparticles with controllable emission wavelength and preparation method

A phenylene vinylene and conjugated polymer technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of poor solubility of PPV polymer, difficult to dissolve, unable to meet the polymer solution, etc., and achieve emission The effect of wavelength controllable, narrow particle size distribution and easy operation

Active Publication Date: 2015-08-19
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Secondly, due to the extremely poor solubility of unmodified PPV polymers, it is difficult to dissolve in general solvents. Therefore, the existing PPV polymers cannot meet the requirements of the post-polymerization method to obtain a stable polymer solution.

Method used

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  • Poly phenylenevinylene conjugated polymer fluorescent nanoparticles with controllable emission wavelength and preparation method
  • Poly phenylenevinylene conjugated polymer fluorescent nanoparticles with controllable emission wavelength and preparation method
  • Poly phenylenevinylene conjugated polymer fluorescent nanoparticles with controllable emission wavelength and preparation method

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Embodiment 1

[0030] See attached figure 1 , which is a schematic diagram of the preparation route of poly(p-phenylenevinylene) conjugated polymer nanoparticles provided in this example, and the specific steps are as follows:

[0031] 1. Refer to the literature (J. Am. Chem. Soc.1993, 115, 10117-10124) to synthesize PPV monomers containing unsubstituted benzene rings, take 0.6895 g (1.965 mmol) of PPV monomers, under anhydrous and oxygen-free conditions Dissolve the prepared PPV monomer in 12 mL H 2 O; then 1.7 mL of 1 M NaOH aqueous solution was slowly added dropwise, placed in an ice-water bath and stirred for 1 h, then added 3 mL of 2 M HCl solution to terminate the reaction, and then dialyzed with a dialysis bag with a molecular weight of 3500 After 24 hours (excluding the 12 hours overnight, the water was changed every 2 hours in other time periods, and 500 mL of deionized water was added each time), and 20 mL of PPV precursor (referred to as pre-PPV) solution was obtained.

[0032] ...

Embodiment 2

[0036] 1. Dissolve 0.6895 g (1.965 mmol) of PPV monomer containing unsubstituted benzene ring synthesized by reference (J. Am. Chem. Soc.1993, 115, 10117-10124) in 12 mL h 2 Then, 1.7 mL of 1 M NaOH aqueous solution was slowly added dropwise, placed in an ice-water bath and stirred for 1 h, then 3 mL of 2 M HCl solution was added to terminate the reaction, and then dialyzed with a dialysis bag with a molecular weight of 3500 After 24 hours (excluding the 12 hours overnight, the water was changed every 2 hours in other time periods, and 500 mL of deionized water was added each time), and 20 mL of PPV precursor solution was obtained. Add 5 ml of the obtained solution into an oxygen-free 250 mL two-neck flask, then add 15 ml of deionized water for dilution, then add 60 ml of methanol and mix thoroughly, heat up to 50 °C, and react for 16 h. After the reaction was completed, under reduced pressure, the temperature of the water bath was controlled at 35 °C, and the methanol was re...

Embodiment 3

[0039] 1. Dissolve 0.6895 g (1.965 mmol) of PPV monomer containing unsubstituted benzene ring synthesized by reference (J. Am. Chem. Soc.1993, 115, 10117-10124) in 12 mL h 2 Then, 1.7 mL of 1 M NaOH aqueous solution was slowly added dropwise, placed in an ice-water bath and stirred for 1 h, then added 3 mL of 2 M HCl solution to terminate the reaction, and then dialyzed with a dialysis bag with a molecular weight of 3500 After 24 hours (excluding the 12 hours overnight, the water was changed every 2 hours in other time periods, and 500 mL of deionized water was added each time), and 20 mL of PPV precursor solution was obtained. Add 5 ml of the obtained solution to an oxygen-free 250 mL two-neck flask, then add 15 ml of deionized water for dilution, then add 60 ml of methanol and mix thoroughly, heat up to 50 °C, and react for 24 h. After the reaction was completed, under reduced pressure, the temperature of the water bath was controlled at 35 °C, and methanol was removed by r...

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Abstract

The invention discloses poly phenylenevinylene conjugated polymer fluorescent nanoparticles with a controllable emission wavelength and a preparation method. The method comprises the following steps of preparing PPV (Poly-Phenylene Vinylene) precursor solution according to a Wessling polymer sulfonium salt precursor method, taking methanol as a substitution reaction agent, replacing tetrahydrothiophene groups of the PPV precursor partly by methoxyl under the anaerobic and high temperature condition, after removing the methanol by vacuum distillation, eliminating residual tetrahydrothiophene groups of the PPV precursor selectively, converting the PPV precursor to PPV light emitting polymer; and obtaining PPV nanoparticles through self-assembly of polymer chains in the process of elimination simultaneously. According to the method provided by the invention, the reaction time of the PPV precursor and the methanol is controlled to obtain PPV nanoparticles with different emission wavelengths. The prepared PPV conjugated polymer fluorescent nanoparticles have the advantages of being narrow in particle size distribution, controllable in emission wavelength, simple in preparation technology, convenient in operation, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a fluorescent nanometer material, in particular to a polyparaphenylene vinylene fluorescent nanoparticle with controllable emission wavelength and a preparation method thereof, belonging to the technical field of polymer luminescent materials. Background technique [0002] In recent years, semiconducting polymer nanoparticles have attracted great attention due to their excellent properties required for fluorescent probes. Such polymer nanoparticles are mainly composed of π-conjugated polymers, also known as polymer dots. Their particle size is extremely small, ranging from a few nanometers to hundreds of nanometers. They have very bright fluorescence and a fast luminescence rate. These advantages in size and fluorescence performance make polymer nanoparticles useful in photovoltaic devices, cell labels, and in vivo applications. Many fields such as imaging, single particle tracking, biosensing and drug release have good practi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L65/00C08J3/03C08J5/18C09K11/06
Inventor 范丽娟陈云陈红
Owner SUZHOU UNIV
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