Self-assembly of brush-shaped block polymer containing PEG segments as well as synthesis method and application of self-assembly

A block polymer and self-assembly technology, which is applied in the preparation and application of photonic crystals, can solve problems such as the complexity of the preparation process of one-dimensional photonic crystals, and achieve the effects of good temperature response, strong controllability, and fast assembly

Active Publication Date: 2021-01-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This effectively reduces the requirements for the molecular weight of the polymer brush and the degree of polymerization of the main cha...

Method used

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  • Self-assembly of brush-shaped block polymer containing PEG segments as well as synthesis method and application of self-assembly
  • Self-assembly of brush-shaped block polymer containing PEG segments as well as synthesis method and application of self-assembly
  • Self-assembly of brush-shaped block polymer containing PEG segments as well as synthesis method and application of self-assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The preparation method of the self-assembled thing BBCP1-5 of the brush block polymer containing PEG segment, its preparation route is as follows figure 1 shown.

[0057] The general structural formula of BBCP1-5 is:

[0058]

[0059] The synthesis of intermediate product 5-norbornene-2-acyl chloride (a), its chemical structure is as follows:

[0060]

[0061] Mix 2.76g (20mmol) of 5-norbornene-2-carboxylic acid with 30mL of thionyl chloride (SOCl 2 ) into a 50mL branch bottle, equipped with a condenser, reflux reaction in an oil bath at 70°C under a nitrogen atmosphere for 5h, and evaporate excess SOCl under reduced pressure 2 , to obtain bright orange-yellow liquid 5-norbornene-2-acyl chloride for use.

[0062] The synthesis of norbornene functionalized polyethylene glycol (NB-PEG) macromer, its chemical structural formula is as shown in A below:

[0063]

[0064] The hydroxyl-terminated PEG was dried with phosphorus pentoxide in a vacuum oven at 120°C fo...

Embodiment 2

[0083] The self-assembly method of the self-assembly (BBCP1-5) of the brush-like block polymer containing PEG segment prepared in embodiment 1 is as follows:

[0084] S1: Take 10mg-50mg of brush-like block polymers (polymers 1-5) containing PEG segments and place them on a glass plate;

[0085] S2: Heat to 60-120°C and keep warm for 5-20 minutes to melt, cover with a cover glass and press film;

[0086] S3: After cooling to room temperature, a series of self-assembled brush-like block polymers (BBCP1-5) containing PEG segments were obtained, that is, one-dimensional photonic crystal materials with different structural colors. Such as Figure 5 As shown, among them, BBCP1 (x=y=200) is purple; BBCP2 (x=y=225) is light blue; BBCP3 (x=y=250) is green; BBCP4 (x=y=275) is yellow Green; BBCP5 (x=y=300) appears orange.

[0087] Confined crystallization behavior of 1D photonic crystals observed under a polarizing microscope. Taking BBCP1 (x=y=200) as an example, the crystallization...

Embodiment 3

[0089] This example is based on the performance test of the one-dimensional photonic crystal materials with different structural colors prepared in Example 2.

[0090] Reflection spectroscopy tests on one-dimensional photonic crystal thin films. as attached Figure 6 As shown, the reflection wavelength of the one-dimensional photonic crystal thin film changes from 350nm to 650nm, and can transmit light waves of specific wavelengths. Based on this characteristic, one-dimensional photonic crystal material can be coated on each layer of optical fiber to control the propagation of light, so it has a good application prospect in the field of optical fiber.

[0091] The one-dimensional photonic crystal film is subjected to 10 cycles of heating to 100°C for melting-cooling to room temperature for crystallization. After each crystallization, the reflectance spectrum is tested. After each melting, the color of the photonic crystal disappears rapidly. After cooling to room temperature,...

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Abstract

The invention discloses a self-assembly of a brush-shaped block polymer containing PEG segments as well as a synthesis method and application of the self-assembly. According to the self-assembly material, the PEG is introduced into the brush-shaped block polymer, and the one-dimensional photonic crystal with bright structural color is prepared through melting self-assembly and cooling limited crystallization, so that the refractive index difference of two sections of the brush-shaped block polymer is effectively improved, the preparation process of the one-dimensional photonic crystal is simplified to a great extent, and the long-wavelength one-dimensional photonic crystal is prepared under the condition that the polymerization degree of a main chain is small. In the process of preparing the one-dimensional photonic crystal, through melting self-assembly and cooling limited crystallization, compared with solvent evaporation self-assembly, the controllability is higher, and the method is easy and convenient to operate, fast to assemble and low in cost. The prepared one-dimensional photonic crystal has good temperature response, thermal repair, pattern splicing and other properties,and has huge application prospects in the aspects of information counterfeiting prevention, thermal sensing, melt spinning, 3D printing, silk-screen printing, functional coatings, optical fibers and the like.

Description

technical field [0001] The invention relates to the technical field of preparation and application of one-dimensional photonic crystals, in particular to a self-assembly of brush-like block polymers containing PEG segments and its synthesis method and application. Background technique [0002] Photonic crystals (PCs) are ordered structures formed by two or more materials with different dielectric constants (refractive indices) arranged in space according to a certain period, and the period can vary from one-dimensional to three-dimensional. In nature, biological tissues such as butterfly wings and magpie feathers show bright colors due to their natural photonic crystal structure. Compared with traditional pigments, photonic crystal structural color has the advantages of high brightness, high saturation, and non-fading, and has broad application prospects in sensing, anti-counterfeiting identification, functional fibers, and new coatings. [0003] Responsive photonic crystal...

Claims

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Application Information

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IPC IPC(8): C08G61/08
CPCC08G61/08C08G2261/126C08G2261/1424C08G2261/1426C08G2261/146C08G2261/3324C08G2261/418C08G2261/90
Inventor 任丽霞郭田田袁晓燕
Owner TIANJIN UNIV
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