Preparation method and application of conjugated polymer film based on acid-cleavable side chain

By adding an acidic solution to the conjugated polymer solution for pretreatment and reprocessing, the problem of poor film quality of acid-crackable side-chain polymers was solved, and continuous and uniform thin films were prepared, which improved charge transport and thermal stability, making them suitable for thermoelectric and heat transfer devices.

CN122011449APending Publication Date: 2026-05-12SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202610173540.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-06
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

Conjugated polymers with acid-crackable side chains suffer from poor film quality during solution processing due to the active movement of short molecular chains and steric hindrance, making it difficult to prepare continuous and uniform films, which affects charge transport and thermal stability.

Method used

Acidic solutions are added to polymer solutions for preprocessing. The acid triggers partial cleavage of side chains, inhibits molecular chain movement, and promotes main chain self-assembly. Subsequent acid solution reprocessing and annealing completely remove the side chains, resulting in a continuous and uniform thin film.

Benefits of technology

It significantly improves the macroscopic morphology and microstructure of polymer films, enhances electrical and thermal conductivity, and is suitable for thermoelectric devices and heat transfer devices.

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Abstract

The invention relates to a preparation method and application of a conjugated polymer film based on an acid-cleavable side chain. The preparation method comprises the following steps: dissolving a conjugated polymer based on an acid-cleavable side chain in a solvent to prepare a polymer solution; uniformly stirring the polymer solution and the first acid solution to prepare a polymer / acid mixed solution pre-processed by the acid solution; coating a substrate with the polymer / acid mixed solution pre-processed by the acid liquid, and forming a polymer film after the solvent is volatilized; performing first thermal annealing on the polymer film; and applying a second acid solution to the surface of the polymer film after the first thermal annealing, and then carrying out second thermal annealing to obtain the conjugated polymer film without the side chain reprocessed by the acid solution. By utilizing the acid sensitivity characteristic of a side chain, an acid solution is added into a polymer solution before a polymer film is formed to pre-remove part of the side chain so as to synergistically induce ordering of the polymer, so that the film forming quality and the comprehensive performance of the polymer are improved.
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