The Main Application Of Polyethersulfone
Polyethersulfone (PES) is a membrane material with excellent performance. Its molecule has the rigidity of benzene ring, the flexibility of ether group and the large conjugated system formed by sulfone group and the whole structural unit. The whole molecule has good stability and mechanical stability. Excellent performance and film-forming performance, the glass transition temperature is as high as 225 ° C, can be used for a long time at 180 ° C, and has excellent properties such as flame resistance, radiation resistance, acid resistance, oxidation resistance, and solvent resistance. The membrane material made of polyethersulfone has high pressure resistance, heat resistance and oxidation resistance, and its biocompatibility is better than other membrane materials. It is an ideal base membrane for preparing composite nanofiltration membranes. In recent years, research and application have been increasing widely.
1) Preparation of a polyethersulfone/functional sugar-containing polymer hybrid membrane. The method uses polyethersulfone membrane as the base membrane, adopts "click chemistry" technology, uses cuprous bromide as the catalytic system, and bipyridine as the initiator, and rapidly completes the reaction of functional sugar-containing polymers under anhydrous and oxygen-free conditions. Surface grafting of polyethersulfone. Using "living"/controllable free radical polymerization method to synthesize functional sugar-containing polymers, maintaining the activity of acetylenic bonds, and high synthesis rate. The invention combines the functional sugar-containing polymer with the polyethersulfone membrane, which has a stable structure, can change the hydrophobicity of the membrane surface, endows the membrane material with excellent hydrophilicity, anti-fouling property, adsorption capacity and service life, and significantly improves the polyethersulfone membrane. Hydrophilization and reusability of sulfone membranes.
2) Preparation of a lithium ion imprinted polyethersulfone composite membrane, which belongs to the technical field of functional material preparation. Polyethersulfone membrane is used as basement membrane material, lithium ion is used as template, 12-crown-4-ether is used as binding site, methacrylic acid is used as functional monomer, ethylene glycol dimethacrylate is used as crosslinking agent, azo Diisobutyronitrile is used as an initiator, combined with dopamine surface modification technology, silica nanocomposite technology, and imprinted polymerization technology to prepare lithium ion imprinted polyethersulfone composite membrane. The static adsorption experiment is used to study the adsorption balance, adsorption kinetics and selective recognition performance of the prepared lithium ion-imprinted polyethersulfone composite membrane; the selective permeation experiment is used to study the prepared lithium-ion imprinted polyethersulfone composite membrane to the Permeability of ions (lithium ions) and non-target ions (sodium and potassium ions). The lithium ion imprinted polyethersulfone composite membrane prepared by the invention has high specific adsorption capacity and recognition and separation capacity for lithium ions.
