Multiple environment-responsive di-block copolymer and preparation method thereof

An environmentally responsive, block copolymer technology, applied in the field of multiple environmentally responsive two-block copolymers and their preparation, can solve problems such as not being able to reflect the properties of polymers well, and achieve the effect of wide application value

Inactive Publication Date: 2008-06-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for more complex environments, these polymers cannot well reflect the characteristics of this type of polymer

Method used

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  • Multiple environment-responsive di-block copolymer and preparation method thereof
  • Multiple environment-responsive di-block copolymer and preparation method thereof
  • Multiple environment-responsive di-block copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (a) In a three-necked flask with stirring, add 20mlDMF, 75mmol (7.67g) triethylamine and 30mmol (4.86g) 7-hydroxycoumarin, at 0°C, pass through N 2 For protection, a solution of 75 mmol (7.84 g) of methacryloyl chloride in 20 ml of DMF was added dropwise, the rate of addition was controlled, and the addition was completed within 1 hour. The reaction was continued at 0° C. for 1 hour, and then the system was heated to room temperature for another 3 hours. After the reaction, the reaction solution was filtered to remove triethylamine hydrochloride, and then precipitated into 400ml of ether, stirred at room temperature for 5 hours, filtered and washed with ether, and vacuum-dried at 40°C for 48 hours to obtain methacrylic acid resin. Soybein ester (CMA).

[0022] (b) Dissolve 0.02g of AIBN, 0.13g of phenylethyl dithiobenzoate, and 7.00g of isopropylacrylamide (NIPAAm) in 25ml of 1,4-dioxane, and react at 60°C for 80 Hour. After the reaction, the solution was poured into...

Embodiment 2

[0027] (a) In a three-necked flask with stirring, add 20mlDMF, 75mmol (7.67g) triethylamine and 30mmol (4.86g) 7-hydroxycoumarin, at 0°C, pass through N 2 For protection, a solution of 75 mmol (7.84 g) of methacryloyl chloride in 20 ml of DMF was added dropwise, the rate of addition was controlled, and the addition was completed within 1 hour. The reaction was continued at 0° C. for 1 hour, and then the system was heated to room temperature for another 3 hours. After the reaction, the reaction solution was filtered to remove triethylamine hydrochloride, and then precipitated into 400ml of ether, stirred at room temperature for 5 hours, filtered and washed with ether, and vacuum-dried at 40°C for 48 hours to obtain methacrylic acid resin. Soybein ester (CMA).

[0028] (b) Dissolve 0.02g of AIBN, 0.18g of phenylethyl dithiobenzoate, and 8.00g of isopropylacrylamide (NIPAAm) in 30ml of 1,4-dioxane, and react at 80°C for 50 Hour. After the reaction, the solution was poured into...

Embodiment 3

[0031] (a) In a three-necked flask with stirring, add 20mlDMF, 75mmol (7.67g) triethylamine and 30mmol (4.86g) 7-hydroxycoumarin, at 0°C, pass through N 2For protection, a solution of 75 mmol (7.84 g) of methacryloyl chloride in 20 ml of DMF was added dropwise, the rate of addition was controlled, and the addition was completed within 1 hour. The reaction was continued at 0° C. for 1 hour, and then the system was heated to room temperature for another 3 hours. After the reaction, the reaction solution was filtered to remove triethylamine hydrochloride, and then precipitated into 400ml of ether, stirred at room temperature for 5 hours, filtered and washed with ether, and vacuum-dried at 40°C for 48 hours to obtain methacrylic acid resin. Soybein ester (CMA).

[0032] (b) Dissolve 0.02g of AIBN, 0.26g of phenylethyl dithiobenzoate, and 7.00g of isopropylacrylamide (NIPAAm) in 30ml of 1,4-dioxane, and react at 90°C for 40 Hour. After the reaction, the solution was poured into ...

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Abstract

The invention relates to a two-block copolymer with multiple environmental responsibilities and a preparation method thereof. The temperature-sensitive monomer is first initiated to be polymerized using the initiators and the chain transfer agents so as to form the macromolecular transfer reagents by adopting the reversible addition-fragmentation chain transfer living radical polymerization RAFT method and then the photosensitive monomer and the pH value sensitive monomer are initiated to be copolymerized with each other using the initiators and macromolecular transfer reagents so as to prepare the two-block copolymer, thus preparing a novel two-block copolymer with multiple environmental responsibilities by introducing three monomers having the temperature, pH and photo responsibilities in the same polymer chain. The aqueous solution of the two-block copolymers has response characteristics over the temperature, pH value and light, and simultaneously the introduced photo-sensitive monomer can be optically dimerized and also can be photolyzed under different wavelengths, so the two-block copolymer can form a plurality of aggregation morphologies, and the reversible transformation between the dissolution and insolubilization of the two-block copolymer can be realized, thus ensuring that the two-block copolymer has a wider application value.

Description

technical field [0001] The invention relates to a multi-environmentally responsive two-block copolymer and a preparation method thereof, in particular to a multi-environmentally responsive two-block copolymer having temperature, pH value and light response characteristics and a preparation method thereof. The invention belongs to the technical field of chemical polymer material preparation. Background technique [0002] Environment-responsive polymers are a class of polymers that can respond to subtle changes (stimuli) in the external environment, resulting in corresponding changes in physical structure and chemical properties or even mutations. External stimuli can be temperature, pH, ionic strength ( Electrolyte), electric field, light, etc. Environmentally responsive polymers have a wide range of applications, such as sensors, actuators, smart switches, drivers, displays, optical communications, drug carriers, biocatalysis, immobilized enzymes, material extraction, cell ...

Claims

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Application Information

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IPC IPC(8): C08F2/38C08F220/26
Inventor 任艳蓉姜学松印杰
Owner SHANGHAI JIAO TONG UNIV
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