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Ethylene-vinyl alcohol copolymer smart film with janus structure, preparation method and application thereof

A technology of vinyl alcohol copolymer film and vinyl alcohol, which is applied in the field of membrane materials, can solve the problems of reducing response efficiency and achieve high response efficiency

Active Publication Date: 2020-06-16
天津鼎芯膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when using the existing grafting technology to graft two kinds of responsive monomers on the surface of the membrane, since the responsive monomers mostly exist in the form of polymers, the spatial positions of the two polymer units are close, and they interact with each other during the response process, thus Reduce response efficiency

Method used

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  • Ethylene-vinyl alcohol copolymer smart film with janus structure, preparation method and application thereof
  • Ethylene-vinyl alcohol copolymer smart film with janus structure, preparation method and application thereof
  • Ethylene-vinyl alcohol copolymer smart film with janus structure, preparation method and application thereof

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preparation example Construction

[0038] The present invention also provides a method for preparing an ethylene-vinyl alcohol copolymer smart film having a Janus structure as described in any of the above embodiments, comprising the following steps:

[0039] S1: Taking the ethylene-vinyl alcohol copolymer film as the base film, immersing the base film in a photoinitiator solution prepared from a volatile solvent to obtain a photoinitiator pre-coating film;

[0040] S2: The photoinitiator pre-coating film includes a dense side and a porous side, and the photoinitiator is fixed on either side of the film by first irradiating either side of the dense side and the porous side, and then coated The solution containing the responsive monomer is distributed, and the responsive monomer is immobilized on either side of the membrane after being irradiated with ultraviolet light.

[0041]In this embodiment, the EVAL film is used as the base film, and the dense side of the EVAL film is irradiated with ultraviolet light, an...

Embodiment 1

[0049] (1) Weigh 10g of ethylene-vinyl alcohol polymer (EVAL) and 40g of dimethyl sulfoxide solvent into a three-necked flask, heat to 60°C, and stir for 4 hours to obtain a homogeneous and transparent casting solution. The content of EVAL in the liquid is 20%, and the content of dimethyl sulfoxide is 80%. After vacuum defoaming, scrape it into a film with a scraper, put it into pure water at 25°C, and use the immersion precipitation phase inversion method to prepare the EVAL film with a thickness of 150 μm. Soak in pure water for 2 days, freeze-dry for later use.

[0050] (2) With the EVAL film prepared in step (1) as the base film, immerse the benzophenone concentration in the benzophenone-acetone solution of 100g / L, vibrate and adsorb for 120min, and directly place the wetted EVAL benzophenone The pre-coated film was irradiated under ultraviolet light for 20 minutes, with the dense side of the film as the light-facing side, the light-absorbing shielding effect of the photo...

Embodiment 2

[0053] The preparation method of the EVAL membrane is the same as in Example 1, except that the concentration of benzophenone is 80 g / L, and the responsive monomer grafted on the porous side of the EVAL membrane is acrylic acid (AAc).

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Abstract

The invention discloses an ethylene-ethenol copolymer intelligent film with a Janus structure, belongs to the field of film materials, can solve a problem in a current grafting technology that while two types of responsive monomers are grafted on the film surface, because the responsive monomer is mostly existent in a polymer mode, and spatial positions of two polymer units are proximate, the twopolymer units are mutually affected in a response process, and response efficiency is low. The technical scheme comprises the ethylene-ethenol copolymer intelligent film with the Janus structure. Twosides of the ethylene-ethenol copolymer film are respectively grafted with the responsive monomers. The ethylene-ethenol copolymer intelligent film with the Janus structure is applied for aspects of separation and purification, water treatment and intelligent sensing.

Description

technical field [0001] The invention belongs to the field of membrane materials, and in particular relates to an ethylene-vinyl alcohol copolymer intelligent membrane with a Janus structure, a preparation method and an application thereof. Background technique [0002] Smart membrane is a new type of membrane material prepared by introducing responsive polymers into membrane substrates. It can change its physical and chemical properties by sensing and responding to changes in environmental signals. Therefore, it can selectively separate substances, It has potential application prospects in the fields of drug controlled release, water treatment and tissue engineering. [0003] At present, grafting is a common means of membrane surface modification, and it is also an effective method to construct smart membranes. Since the responsive monomer and the base film polymer are connected by chemical bonds in the grafting technology, the smart film obtained by the grafting method has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/18C08L23/08B01D71/78B01D71/38B01D69/02B01D67/00
CPCB01D67/0006B01D69/02B01D71/38B01D71/78C08J7/18C08J2323/08
Inventor 叶卉张玉忠李昱于腾飞黄莉兰焦蕊
Owner 天津鼎芯膜科技有限公司
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