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An amino acid-induced supramolecular chiral membrane and its preparation method

A supramolecular chiral membrane and amino acid technology, applied in the field of supramolecular chiral membrane and its preparation

Active Publication Date: 2018-07-06
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there has been no public report on the preparation of supramolecular chiral membrane materials with controllable positive and negative chiralities by using polymer separation membranes as substrates.

Method used

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  • An amino acid-induced supramolecular chiral membrane and its preparation method
  • An amino acid-induced supramolecular chiral membrane and its preparation method
  • An amino acid-induced supramolecular chiral membrane and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Weigh 10 g of ethylene-vinyl alcohol copolymer, dissolve it in 40 g of dimethyl sulfoxide solvent at 60° C., and stir thoroughly for 6 hours to obtain a homogeneous and transparent casting solution. After vacuum defoaming, pour the film casting solution on a glass plate and scrape it with a scraper to form a film. Then put the glass plate with the cast film liquid film into pure water at 25°C, and use the ethylene-vinyl alcohol copolymer film prepared by immersion precipitation phase inversion method. Soak in pure water for 2 days, take out and dry for later use. The resulting film had a thickness of 124 μm and a porous structure.

[0033] (2) Immerse the ethylene-vinyl alcohol copolymer film obtained in step (1) into a solution of benzophenone in acetone with a concentration of 0.1 g / L. After 2 hours, the ethylene-vinyl alcohol film coated with benzophenone The alcohol copolymer film is placed on the quartz glass sheet, and an appropriate amount of purified N,N-d...

Embodiment 2

[0037] (1) According to the method of step (1) (2) in the embodiment 1, the ethylene-vinyl alcohol copolymer base film with the grafting rate of 15wt% surface with PDMAEMA grafted chains was prepared.

[0038] (2) Take a certain amount of anionic porphyrin and L-tryptophan, D-tryptophan is dissolved in deionized water respectively, take an appropriate amount of anionic porphyrin solution and L-tryptophan or D-tryptophan The solutions are mixed, and the pH value is adjusted to 1.5 with 10% hydrochloric acid solution to prepare a mixed solution of anionic porphyrin-L-tryptophan and a mixed solution of anionic porphyrin-D-tryptophan, wherein the anionic porphyrin The concentration is 2×10 -6 The concentration of M, L-tryptophan or D-tryptophan was 5 mM. After the mixed solution was left to stand for 5 hours, the ethylene-vinyl alcohol copolymer base film with a positively charged polymer chain on the surface obtained in step (1) was placed in an anionic porphyrin-L-tryptophan mi...

Embodiment 3

[0041] (1) Weigh 6g of polysulfone and dissolve it in 200mL of chloroform, and stir until the polysulfone is completely dissolved. Then add 5g paraformaldehyde, 21mL trimethylchlorosilane ((CH 3 ) 3 SiCl) and 0.2mL catalyst SnCl 4 , mixed evenly, placed in an oil bath at 50°C, and stirred for 48 hours. After the reaction, the product was poured into dehydrated ethanol to precipitate the product, filtered and washed three times with dehydrated ethanol, and dried in vacuum for later use. The obtained product was chloromethylated polysulfone (CMPSf).

[0042] Weigh 4g of polysulfone with chloromethyl groups, 2.5g of polyethylene glycol (molecular weight: 400), dissolve in 18.5g of dimethylacetamide solvent at 70°C, stir thoroughly for 6 hours to obtain a homogeneous and transparent casting film liquid. After vacuum defoaming, pour the film casting solution on a glass plate and scrape it with a scraper to form a film. Then put the glass plate with the cast film liquid film in...

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Abstract

The invention provides a membrane material with supramolecular chirality induced by amino acids, which can be applied to the research and preparation of information access, sensors, and chiral separation membranes. The material is completely composed of achiral materials, with achiral polymer as the base film, on the surface of the base film, positively charged polymer chains are made to interact with anionic porphyrins; under the induction of tryptophan anion Type porphyrin exists on the surface of the membrane in a chiral supramolecular aggregated state; the amino acid is fully washed and removed to obtain a chiral membrane material. In the circular dichroism spectrum, there is a chiral signal at the ultraviolet absorption wavelength of the corresponding porphyrin. The chiral signal corresponds to the three-dimensional structure of tryptophan. The L-amino acid induces a negative chiral signal, and the D-amino acid induces a positive chirality. Signal.

Description

technical field [0001] The invention relates to a chiral membrane material, in particular to a supramolecular chiral membrane composed of non-chiral materials and a preparation method thereof. It can be applied to information access, sensors, molecular device design, chiral separation membranes and other related fields. Background technique [0002] Chirality is a basic property of nature, and it has been widely used and researched in many fields such as life science, material science, and medicinal chemistry. Supramolecular chirality is a chiral feature constructed by non-covalent weak interactions. Due to its wide application in asymmetric catalysis, nonlinear optics, molecular recognition and assembly, design of molecular devices and determination of the absolute configuration of chiral molecules, it has become one of the research hotspots of scientists in recent years. Supramolecular chirality can be formed through self-assembly of chiral molecules, co-assembly of achi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/18C08J9/28C08J5/18C08L23/08C08L81/06C08L29/04C08L27/08C08L27/06C08L33/20C08K5/3415B01D69/02B01D71/78B01D67/00
Inventor 赵莉芝张玉忠刘满满
Owner TIANJIN POLYTECHNIC UNIV