アゾ化合物の光固液相転移と可逆接着剤への応用

抄録

Some of azobenzene-based low-molecular-weight compounds and polymers exhibit reversible solid–liquid

phase transition upon UV and visible light irradiation. Such materials possess multi-azobenzene side chains

connected to their backbone with relatively long methylene spacer, and thus, upon UV irradiation, the material

with cis-azobenzene moiety become liquid due to its glass transition temperature below room temperature.

The phase transition materials can be used for reversible adhesives that can bond and debond two substrates

on demand. The photochemical process has unique features such as athermal, contactless, and spatio-seletive

activation, although the one of the two substrates must penetrate irradiating light. In this review, azobenzenebased

solid–liquid phase transition materials are reported with a focus on the relationship among the chemical

structure, solid–liquid phase transition behavior, and reversible adhesive ability.