Low molar mass carbon dioxide-based polycarbonate diols, methods of making and use thereof

By copolymerizing epoxides and phthalaldehyde under the action of catalysts and initiators, combined with mild acid pyrolysis, the control difficulties and environmental problems in the synthesis of low molar mass polycarbonate diols have been solved, realizing the efficient and environmentally friendly preparation of low molar mass polycarbonate diols and enhancing the application potential of the materials.

CN122103544APending Publication Date: 2026-05-29HENAN ACADEMY OF SCI CHEM RES INST CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HENAN ACADEMY OF SCI CHEM RES INST CO LTD
Filing Date
2026-04-08
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing technologies make it difficult to precisely control reaction conditions when synthesizing low molar mass polycarbonate diols, resulting in a wide molecular weight distribution of the product. Furthermore, commonly used catalysts have negative environmental impacts, limiting their application in certain fields.

Method used

A high molar mass polycarbonate was formed by copolymerizing epoxide and phthalaldehyde under a carbon dioxide atmosphere using triethylboron catalyst and bis(triphenylphosphine)amine chloride initiator. Then, the acetal bond was cleaved under mild acidic conditions to obtain a low molar mass polycarbonate diol. A non-metallic catalyst was used to avoid metal residue and to recover phthalaldehyde.

Benefits of technology

This method enables highly selective and efficient synthesis of low-molar-mass polycarbonate diols, shortening reaction time, reducing environmental pollution, improving material utilization, conforming to the concept of green chemistry, and reducing production costs.

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Abstract

The application belongs to the technical field of polymer synthesis, and particularly relates to a low-molar-mass carbon dioxide-based polycarbonate diol and a preparation method and application thereof. The preparation of the low-molar-mass carbon dioxide-based polycarbonate diol is realized in two steps, i.e., first, epoxide, o-phthaldehyde and carbon dioxide are copolymerized under the action of a catalyst and an initiator to obtain high-molar-mass carbon dioxide-based polycarbonate, and then, the acetal bond is cleaved under mild acidic conditions to release o-phthaldehyde, thereby obtaining the low-molar-mass carbon dioxide-based polycarbonate diol. The catalyst used in the application can avoid the residue of metal elements and exhibits excellent catalytic performance and high selectivity under mild conditions. The o-phthaldehyde released after hydrolysis of the acetal bond can be easily recycled for subsequent use, effectively reducing the environmental burden in the synthesis process, realizing the recycling of resources, conforming to the concept of green chemistry, and effectively reducing the production cost.
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