Carboxymethyl cellulose based reversible photochromic hydrogel and its preparation method

A carboxymethyl cellulose, photochromic technology, applied in the field of hydrogels and photochromic hydrogels, can solve the problems of poor biocompatibility, toxic cross-linking agents, etc., and achieve good biocompatibility and preparation The method is simple and the effect of good degradability

Active Publication Date: 2013-07-31
BEIJING INSTITUTE OF TECHNOLOGYGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a simple cellulose-based reversible photochromic hydrogel and its Preparation

Method used

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  • Carboxymethyl cellulose based reversible photochromic hydrogel and its preparation method
  • Carboxymethyl cellulose based reversible photochromic hydrogel and its preparation method
  • Carboxymethyl cellulose based reversible photochromic hydrogel and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1: Add 0.60 g of CMC with a degree of substitution of 1.0 into 20 g of water, and stir until dissolved;

[0033] Step 2: Add 0.80 g of phosphotungstic acid to 10 g of water and shake until dissolved;

[0034] 1. Step 3. Under the condition of magnetic stirring, slowly add the phosphotungstic acid solution into the CMC solution dropwise, and the stirring speed is greater than 1000rpm;

[0035] Step 4, after the dropwise addition, stop stirring and let stand for 2 h;

[0036] The reason why hydrogel cannot be formed by using the above dosage and preparation method is that the addition of phosphotungstic acid is insufficient.

Embodiment 2

[0038] Step 1: Add 0.60 g of CMC with a degree of substitution of 1.0 into 20 g of water, and stir until dissolved;

[0039] Step 2: Add 0.83 g of phosphotungstic acid to 10 g of water, shake until dissolved;

[0040] Step 3. Under the condition of magnetic stirring, slowly add the phosphotungstic acid solution into the CMC solution dropwise, the stirring speed is greater than 1000rpm, and the phosphotungstic acid solution does not exceed 10s / drop;

[0041] Step 4: After the dropwise addition, the stirring was stopped and left to stand for 2 hours to obtain a reversible photochromic hydrogel.

[0042] The obtained hydrogel was irradiated under ultraviolet light for about 5 hours, and the hydrogel turned blue. After the discolored hydrogel was placed in a dark place for about 5 hours, the hydrogel turned colorless again.

Embodiment 3

[0044] Step 1. Add 0.60 g of CMC with a degree of substitution of 1.0 to 20 g of water, and stir until dissolved;

[0045] Step 2: Add 0.83 g of phosphotungstic acid to 10 g of water, shake until dissolved;

[0046] Step 3. Slowly add the CMC solution dropwise to the phosphotungstic acid solution under the condition of magnetic stirring;

[0047] Step 4, after the dropwise addition, stop stirring and let stand for 2 h;

[0048] The hydrogel cannot be formed because the way of adding CMC and phosphotungstic acid solution is wrong.

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Abstract

The invention relates to a preparation method of a carboxymethyl cellulose based reversible photochromic hydrogel. The preparation method comprises the following steps: dissolving carboxymethyl cellulose of different substitution degrees into water to prepare a carboxymethyl cellulose aqueous solution, preparing a phospho-tungstic acid aqueous solution, mixing the phospho-tungstic acid solution and the carboxymethyl cellulose aqueous solution under the condition of continuous stirring, controlling addition manner and dosage of phospho-tungstic acid, and finally stopping stirring and standing for 2h so as to obtain the carboxymethyl cellulose based hydrogel.

Description

technical field [0001] The invention relates to a hydrogel with an organic substance as a matrix, in particular to a preparation method of a carboxymethyl cellulose-based reversible photochromic hydrogel, and belongs to the field of photochromic hydrogels. Background technique [0002] During the photochemical reaction, the physical properties of photochromic materials change while the refractive index, relative permittivity, redox potential and geometric structure also change. Therefore, photochromic materials have many potential applications, such as: photosensitive measurement and thermal measurement, radiation measurement, optical switches, optical filters, displays, information storage, solar energy conversion, light regulation, optical information genetic materials, etc., especially in In terms of biological applications, photochromic materials have unique advantages, because light waves will not damage relatively fragile biological tissues and organs. Compared with t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08L1/26C08K3/32C09K9/00
Inventor 邵自强王茜李友琦王飞俊谢莹陈洋溢王文俊李永红
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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