Photo-responsive materials have attracted widespread attention for their potential advantages in resource conservation and sustainable use. Among the various photo-responsive molecules, azobenzene groups exhibit unique photoconductive cis-trans isomerization responsiveness and find extensive applications in the field of photo-controlled smart materials. This paper presents the preparation of a photo-responsive polyurethane material (denoted as PBHC6AB-U) incorporating azobenzene groups into its main chain. PBHC6AB-U exhibits outstanding photo-response performance, boasting a photo isomerization efficiency of 71.7%, and can achieve 20 cycles of the write-erase process under alternating UV and visible light irradiation. Moreover, by incorporating this material into A4 paper, one can prepare a photo-responsive erasable paper with a hydrophobic water contact angle of 110°, capable of multiple cycles of use. It possesses excellent photochromic and waterproof properties, showcasing a promising application prospect in the field of optical information storage.
Adhesives are a class of substances that can join two or more substrates together, and the development of reusable adhesives has been favored by scientists in recent years. Some azo phenyl derivatives (Azo) can undergo photoisomerization after UV irradiation, reversibly converting from solids to liquids and returning to solids under visible light. During the photoisomerization process, the trans and cis-configurations of Azo exhibited significantly different melting point (Tm) and/or glass transition temperature (Tg), which provided a theoretical basis for the preparation of reversible adhesives at room temperature using Azo's photosolid-liquid transition. Focusing on the research of azo phenyl photophase change adhesives, this paper reviews the latest research progress of two types of azo phenyl photophase change adhesives, which points out the direction for the design and development of new azo phenyl photophase change adhesives.
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