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A molecularly imprinted fiber material and its preparation method

A technology of molecular imprinting and fiber materials, applied in fiber treatment, chemical instruments and methods, and other chemical processes, can solve the problems of low-molecular imprinting materials, unfavorable, high grafting rates, etc., to promote development and application, fast adsorption Effect of speed, high mechanical strength

Inactive Publication Date: 2011-12-28
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is still difficult to find a suitable system for the preparation of molecularly imprinted materials based on fibers, so that the imprinted fibers have both high imprinting efficiency and high grafting rate.
The reason is that imprinting and grafting often require different reaction conditions, and the optimal conditions for imprinting are often not conducive to obtaining a high grafting rate.
Because of this, although fiber-based imprinted materials have many potential advantages, there are very few molecularly imprinted materials prepared on the basis of fibers, especially organic fibers such as polypropylene, polyacrylonitrile, and polytetrafluoroethylene.

Method used

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  • A molecularly imprinted fiber material and its preparation method
  • A molecularly imprinted fiber material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 20 g of the pretreated polypropylene fiber and put it into a stoppered Erlenmeyer flask, and seal it with a silica gel membrane. It is irradiated with cobalt 60 gamma rays, the radiation dose is controlled to 48KGy, and the irradiation time is 55 hours. Acrylic acid monomer and methanol are prepared into 150ml homogeneous mixed solution according to volume percentage 30:70, 5g of pre-irradiated polypropylene fiber is added according to 1:30 bath ratio (weight: volume), and 5% of activator is added salt, reacted at a temperature of 60°C for 6 hours, washed the grafted fibers with methanol to remove homopolymers and unpolymerized grafted monomers, dried in vacuum, and calculated the grafting rate to be 200%. The grafted fiber was added to 1wt.% polyethyleneimine methanol solution to react for 10h, and then washed with methanol to remove unreacted polyethyleneimine. After drying, the polyethyleneimine grafting rate was calculated to be 50%. Add polyethyleneimine gra...

Embodiment 2

[0026] Put 20 g of pretreated polypropylene fibers into a stoppered Erlenmeyer flask and seal it with a silica gel membrane. It is irradiated with cobalt 60 gamma rays, the radiation dose is controlled to 48KGy, and the irradiation time is 55 hours. According to 1:30 bath ratio (weight: volume), 5 g of pre-irradiated polypropylene fiber was added to 10 / 90 (v / v) % acrylic acid / water mixed solution, and reacted at 80 ° C for 1 hour. The grafted fibers after the reaction were washed with methanol to remove homopolymers and unpolymerized monomers, dried in vacuum, and the calculated grafting rate was 100%. The grafted fiber was added to a 30wt.% polyethyleneimine (PEI) aqueous solution to react for 8 hours, and then washed with methanol to remove unreacted polyethyleneimine. After drying, the polyethyleneimine grafting rate was calculated to be 60%. Add polyethyleneimine grafted fiber to 100ppm zinc nitrate solution, add the fiber to 10% glutaraldehyde ethanol solution to react f...

Embodiment 3

[0028] Weigh 20 g of the pretreated polyacrylonitrile fiber and put it into a stoppered Erlenmeyer flask, and seal it with a silica gel membrane. It is irradiated with cobalt 60 gamma rays, the radiation dose is controlled to 48KGy, and the irradiation time is 55 hours. Acrylic acid monomer and methanol are formulated into a homogeneous mixed solution at a ratio of 20:80 by volume, 5 g of pre-irradiated polyacrylonitrile fibers are added at a bath ratio of 1:30 (weight: volume), and activator Moore is added at a rate of 5%. salt, reacted at a temperature of 60° C. for 6 hours, washed the grafted fibers after reaction with methanol to remove homopolymers and unpolymerized monomers, dried in vacuum, and calculated the grafting rate to be 100%. The grafted fiber was added to 1wt.% polyethyleneimine methanol solution to react for 10h, and then washed with methanol to remove unreacted polyethyleneimine. After drying, the polyethyleneimine grafting rate was calculated to be 40%. Ad...

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Abstract

The invention discloses a molecularly imprinted fiber material and a preparation method thereof. The matrix of the molecularly imprinted material is an organic fiber, specifically polypropylene, polytetrafluoroethylene, viscose, polyacrylonitrile or polyvinyl alcohol. The preparation method comprises the following steps of: radiating the matrix fibers after being preprocessed using cobalt 60 gamma rays, mixing the radiated fibers with a graft monomer, and after a grafting reaction, removing homopolymers from the fibers through extraction filtration, and then drying the fibers in vacuum, thereby obtaining grafted modified fibers; reacting the grafted modified fibers with a functional polymer or a functional monomer, after the completion of the reaction, washing away the non-reacted functional polymer or functional monomer on the surface of the fibers, and then adding the fibers to the solution of template ions or template molecules to absorb the template ions or the template molecules;after the absorption is saturated, performing cross-linking using a cross-linking agent, and after the reaction is ended, removing the template ions or the template molecule through desorption using a desorbent, thereby obtaining the molecularly imprinted fiber material. The fiber material of the invention has high mechanical strength, high thermal stability, high chemical stability, high absorption capacity and high selectivity.

Description

technical field [0001] The invention relates to a molecularly imprinted fiber material and its preparation method and application, which is a technology for preparing the molecularly imprinted fiber material by further performing imprinting on the surface of the fiber by grafting and modifying the fiber as a matrix. Background technique [0002] Molecular imprinting technology can conveniently design and prepare materials with selective recognition for target molecules. Due to the advantages of high selectivity, stability, and ease of preparation, molecularly imprinted materials are widely used in chromatography, drug delivery, catalysts, solid phase extraction, separation and recovery, and other fields. However, the application of molecularly imprinted materials prepared by traditional methods such as bulk polymerization is limited due to the disadvantages of slow mass transfer, embedding of recognition sites, and easy residue of templates in the matrix. To overcome these ...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/24B01J20/28B01J20/30D06M14/28D06M14/22D06M15/61D06M15/263D06M15/53C08J9/26C08J3/24C08G65/26
Inventor 陈水挟李统一
Owner SUN YAT SEN UNIV
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