Photochromic multi-component copolyester, photochromic biodegradable polyester film as well as preparation and application of photochromic multi-component copolyester and photochromic biodegradable polyester film

By designing block or random copolymers of photochromic multi-component copolyesters, the problems of complexity in preparation and insufficient performance of existing photochromic film materials have been solved, achieving rapid and stable photoresponse and reversible color change, which is suitable for information storage and intelligent anti-counterfeiting fields.

CN122145775APending Publication Date: 2026-06-05CHANGCHUN INSTITUTE OF APPLIED CHEMISTRY CHINESE ACADEMY OF SCIENCES
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Patent Information

Application Number
CN202610638065.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-11
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing photochromic thin film materials suffer from problems such as complex preparation steps, limited raw material types, high cost, poor thermal stability, and insufficient mechanical properties. In particular, diarylene materials have poor film-forming properties and are difficult to adjust.

Method used

Photochromic multi-component copolyesters are used to combine diarylene-based photochromic structural units with polylactone segments through block or random copolymerization to form a biodegradable film. The mechanical properties and degradation rate are controlled to achieve rapid and stable photoresponse and reversible color change.

Benefits of technology

The prepared film has excellent film-forming properties, fast and stable light response and reversible color change capability, adjustable mechanical properties, and is suitable for information storage and intelligent anti-counterfeiting fields. It is also biodegradable in the natural environment.

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Abstract

The invention discloses a photochromic multicomponent copolyester, a photochromic biodegradable polyester film as well as preparation and application of the photochromic multicomponent copolyester and the photochromic biodegradable polyester film. The copolyester comprises a first repetitive unit as shown in a formula (I) and a second repetitive unit as shown in a formula (II), the molar ratio of the first repeating unit to the second repeating unit is (5-95): (95-5). A diarylethene photochromic structural unit and a polylactone chain segment are introduced into a main chain of a polyester molecule, a block or random copolymer can be synthesized according to needs, polyester is endowed with intrinsic photochromic characteristics and biodegradability synergistically, and meanwhile, the mechanical property and degradation rate of a material can be accurately regulated and controlled; the invention further provides a photochromic biodegradable polyester film prepared from the polyester, the film is adjustable in mechanical property, rapid and stable in photoresponse and excellent in film forming property, and reversible photochromism and controllable degradation can be achieved.
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