Sulfone polymer with narrow molecular weight distribution and low gel content and preparation method thereof

The problem of gel structure formation was solved by solvent purification and deoxygenation treatment when preparing sulfone polymers in the solution method, and a sulfone polymer material with narrow molecular weight distribution and good processing performance was obtained.

CN119661850APending Publication Date: 2025-03-21WANHUA CHEM GRP CO LTD
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Patent Information

Application Number
CN202411913587.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2025-03-21

AI Technical Summary

Technical Problem

In the prior art, when preparing sulfone polymers in solution method, it is difficult to effectively remove trace oxygen in non-protic polar solvents, resulting in polymer chain branching or crosslinking, forming a gel structure, which in turn affects the molecular weight distribution and processing performance of the material.

Method used

By purifying and deoxygenating the aprotic polar solvent, the oxygen content in the reaction system is reduced, and a phased heating reaction is adopted to reduce the formation of polymer radicals, thereby controlling the gel structure content and obtaining a sulfone polymer with a narrow molecular weight distribution.

Benefits of technology

The linear structure and narrow molecular weight distribution of sulfone polymer are realized, the processing and forming performance of the material is improved, the content of the gel structure is reduced, and the use value of the product is enhanced.

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Abstract

The invention belongs to the field of sulfone polymer materials, and particularly relates to a sulfone polymer with narrow molecular weight distribution and low gel content and a preparation method thereof. The preparation method comprises the following steps: 1) adding an organic bisphenol compound, 4, 4 '-dichlorodiphenyl sulfone, a salt-forming agent and a purified aprotic polar solvent into a reactor, uniformly stirring and mixing the system, then carrying out deoxygenization operation, and controlling the oxygen content in the system to be less than or equal to 100ppm; and 2) after the replacement is completed, introducing inert gas (such as nitrogen) into the system for a long time, and carrying out two-stage heating reaction under the condition to obtain a viscous sulfone polymer solution. The molecular weight distribution of the sulfone polymer is less than 3, and the gel structure content is greater than 0 and less than 3 mol%. The oxygen content in a reaction system is reduced, and generation of polymer free radicals is reduced, so that the gel structure content is controlled, and the linear sulfone polymer material with narrow molecular weight distribution is obtained.
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