Ph responsive polyion liquid composite membrane and preparation method thereof

Abstract

The invention relates to a preparation method of a pH responsive polyion liquid composite membrane. The preparation method comprises the following steps in sequence: (1) directly preparing a polyion liquid composite membrane through in situ polymerization after mixing a polymeric imidazole monomer, an acrylonitrile monomer, a crosslinking agent and an initiator; (2) performing ion exchange on the polyion liquid composite membrane in the step (1) and an anionic dye to obtain the pH responsive polyion liquid composite membrane, wherein the structural formula of the anionic dye is one of the structural formulas as shown in the specification. Control of responses of the polyion liquid composite membrane to different pH ranges can be achieved by adopting simple and direct anion exchange. The designed polyion liquid membrane is simple, has good reusability and is short in response time.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a polymer film, in particular to a pH-responsive polyionic liquid composite film and a preparation method thereof. Background technique [0002] In recent years, due to the advantages of ionic liquids such as zero vapor pressure, wide electrochemical window, high thermal stability, and high conductivity [Acc. Polyionic liquids have attracted more attention. By simply controlling the molecular structure of ionic liquids so that they have some polymerizable cations or anions and then polymerizing, polyionic liquids can be obtained. As a new type of functional material, polyionic liquids can be used as polymer electrolytes, catalysts, ion-conducting materials, CO 2 Adsorbents, microwave absorbing materials, etc. The so-called pH-responsive polymer material is a polymer material that can change in volume or shape due to changes in pH. Common pH polymer responsive materials contain a...

AI Technical Summary

Problems solved by technology

The response to pH in aqueous solution and non-aqueous solution can be realized as the color changes with different pH (see Analyst, 2011, 136, 1302-1304), expanding the range of solutions used by methyl red and methyl orange, but The reusability of this method is not good, and the pH response range is narrow

The traditional pH test paper also has the disadvantage that it can only be used once, so it is necessary to seek a simple and reusable method that responds to pH

[0003] The Chinese invention patent with publication number CN102408503A discloses a preparation method of polyglyceryl methacrylate with pH responsiveness, and polymethacrylic acid with acidic groups is prepared by reacting amine polymers with glycidyl methacrylate Glycerides, polyglyceryl methacrylates with acidic functional groups are prepared by reacting acid anhydrides with glyceryl methacrylates, thereby preparing polyglyceryl methacrylates with functional groups of semi-interpenetrating polymer network structures, and the prepared polymers can be used for The response to pH is observed by titration, but the process of this method is complicated, and the method of detecting its pH response has no intuitive performance, which requires the help of instruments, and cannot be reused

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