Preparation method of sulfonated polyethersulfone for preparing macromolecule separation films

Abstract

The invention discloses a chemical synthesis method of macromolecule materials and particularly relates to a preparation method of sulfonated polyethersulfone for preparing macromolecule separation films. The preparation method includes steps of drying polyethersulfone, adding the same serving as solute into concentrated sulfuric acid to dissolve, preparing chlorosulfonic acid serving as sulfonating agent and the polyether sulfone according to a certain proportion and mixing the same to react for 2 to 8 hours, transferring materials of the mixture into ice and water mixed liquid and precipitating products from the mixed liquid after reaction is finished, washing the products to be neutral by distilled water after the products are filtered, and finally drying the products to obtain sulfonated polyethersulfone. The preparation method has the advantages that the products uniform in sulfonation degree are obtained, precipitation and the like under the action of solvent is avoided during integral reaction, the macromolecule separation film prepared by the sulfonated polyethersulfone has better separation effect, water flux capability, contamination resistance and more stable performance and the like. The sulfonated polyethersulfone prepared by the preparation method has wide application prospect in film manufacturing field.

Description

technical field [0001] The invention relates to a chemical synthesis method of polymer materials, in particular to a preparation method of sulfonated polyethersulfone used for preparing polymer separation membranes. technical background [0002] Polyethersulfone (PES for short), the structural formula is [0003] [0004] It has a rigid benzene ring and a flexible ether group in its molecule, and the sulfone group forms a large conjugated system with the entire structural unit, so the entire molecule has good stability and exhibits excellent mechanical properties and creep resistance. And its outstanding heat resistance, thermal oxidation resistance and chemical stability are widely used in the preparation of separation membranes as separation membrane materials. However, its hydrophobicity makes it easy to cause adsorption and deposition of hydrophobic solutes on the surface of the membrane during the membrane water treatment process, which causes the membrane pores to ...

AI Technical Summary

Problems solved by technology

According to the mechanism of the sulfonation reaction, when the benzene ring has an electron-donating group, it is beneficial to the formation of the complex, which is beneficial to the sulfonation reaction; The large electron cloud of the ring is weakened, which is not conducive to the stability of the complex formed by it, so it is not conducive to the sulfonation reaction

Since part of the benzene ring of polyethersulfone is connected with the strong electroabsorbing sulfone group, the benzene ring is passivated, so electrophilic substitution is very difficult, and the space occupied by the sulfone group and the sulfonic acid group itself is large, and the sulfonation The steric effect is larger than the corresponding halogen atom, so the steric hindrance effect is very significant, so the sulfonation reaction process of polyethersulfone is relatively difficult

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