Preparation method of thermally reversible color-changing composites based on polydiacetylene and metal-organic framework compounds

A technology of metal-organic framework and composite materials, which is applied in the field of preparation of thermally reversible discoloration materials, can solve the problems that sensors cannot be reused and have little practical value

Active Publication Date: 2021-07-23
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When PDA is stimulated by temperature, it will show a transition from blue to red, but the red PDA generally cannot return to the original blue after the temperature is lowered, so the sensor made of pure PDA cannot be reused and has little practical value.

Method used

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  • Preparation method of thermally reversible color-changing composites based on polydiacetylene and metal-organic framework compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1. Preparation and performance of poly(PCDA) / MOF-177 composite material

[0017] (1) Preparation of poly(PCDA) / MOF-177 composites

[0018] Weigh 0.475 g Zn(NO 3 ) 2 ·6H 2 O and 0.095 g H 3 Add 30 mL of DMF to BTB in a beaker, stir at room temperature for 30 min, the solution turns slightly yellow after being completely dissolved; pour the mixed solution into a 50 mL polytetrafluoroethylene reactor, degas under vacuum for 20 min, and release the gas. After 3 consecutive times, the reaction kettle was gently placed in an oven and reacted at 85°C for 48 h; at the end of the reaction, light yellow crystals were precipitated, filtered with suction, washed with a small amount of DMF ultrasonically for 3 times, and dried in vacuum at 65°C for 24 h. Obtained 0.144g MOF-177;

[0019] Weigh 8 mg of purified 10,12-pentacosadiynoic acid (PCDA), dissolve it in 3 mL of dimethyl sulfoxide, add 7 mL of deionized water to obtain PCDA solution; take 3 mg of MOF-177, Dispers...

Embodiment 2

[0022] Example 2. Preparation and reversible thermochromic properties of poly(TCDA) / MOF-177 composites

[0023] (1) Preparation of poly(TCDA) / MOF-177 composites

[0024] Weigh 8 mg of purified 10,12-trisosadiynoic acid (TCDA), dissolve it in 3 mL of dimethyl sulfoxide, add 7 mL of deionized water to obtain TCDA solution; take 3 mg of MOF-177, Disperse in 10 mL deionized water to obtain MOF-177 solution; then mix TCDA solution and MOF-177 solution, sonicate at 65-80°C for 30-60 min, cool to room temperature, and stand at low temperature for 10-16 h to obtain white suspension; it was irradiated and polymerized under ultraviolet light with a wavelength of 254 nm for 10 min to obtain a blue suspension—poly(TCDA) / MOF-177.

[0025] The test results of reversible thermochromic properties show that poly(TCDA) / MOF-177 has similar thermal reversible discoloration properties as poly(PCDA) / MOF-177.

Embodiment 3

[0026] Example 3. Preparation and reversible thermochromic properties of poly(HDDA) / MOF-177 composites

[0027] (1) Preparation of poly(HDDA) / MOF-177 composites

[0028] Weigh 8 mg of purified 5,7-hexadecadiynoic acid (HDDA), dissolve it in 4 mL of dimethyl sulfoxide, add 6 mL of deionized water to obtain HDDA solution; take 3 mg of MOF-177, and disperse in 10 mL of deionized water to obtain MOF-177 solution; then mix HDDA solution and MOF-177 solution, sonicate at 65-80°C for 30-60 min, cool to room temperature, and stand at low temperature for 10-16 hours to obtain a white suspension; It was irradiated and polymerized under ultraviolet light with a wavelength of 254 nm for 10 min to obtain a blue suspension—poly(HDDA) / MOF-177.

[0029] The test results of reversible thermochromic properties show that poly(HDDA) / MOF-177 and poly(PCDA) / MOF-177 have similar thermally reversible discoloration properties.

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Abstract

The present invention provides a method for the preparation of thermally reversible discoloration composites based on polydiacetylene (PDA) and metal-organic frameworks (MOFs), that is, dispersing pure diacetylene monomer (DA) into dimethyl sulfoxide ‑In a mixed solvent of deionized water; disperse the metal-organic framework compound in deionized water, and add it to the acetylene monomer solution to form a mixed solution; then ultrasonicate the mixed solution at 65~80°C for 30~60 min, Assemble to obtain a white suspension; then irradiate and polymerize the white suspension under ultraviolet light with a wavelength of 254 nm to obtain a blue suspension, which is a thermally reversible color-changing composite material. In the present invention, through the interaction between PDA and MOFs, the disordered PDA conformation can be restored to an ordered conformation arrangement after heating, so that the composite material can quickly recover from purple red to blue, so the composite material has excellent The thermally induced reversible discoloration behavior can be used as a temperature sensor in many fields.

Description

technical field [0001] The invention relates to a preparation method of a thermally reversible discoloration material, in particular to a thermally reversible discoloration composite material based on polydiacetylene and a metal organic framework compound and a preparation method thereof, belonging to the field of intelligent sensing. [0002] technical background [0003] As an emerging multifunctional material, smart materials have extensive research and broad application prospects. Smart materials can be divided into two categories: one is sensory materials, which can be made into various sensors to collect information on external stimuli or system working status; the other is to respond to changes in external environmental conditions or internal states. Responsive materials can be fabricated into various actuators. Smart materials are made into sensors and actuators. With the help of modern information technology, the sensory information is processed and the instructions...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L87/00C08L49/00C09K9/02C08F138/00
CPCC08F138/00C08L49/00C08L87/00C09K9/02C09K2211/188
Inventor 常玥李小妹张亚娜李梦佳曹姗姗查飞
Owner NORTHWEST NORMAL UNIVERSITY
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