Photo-Controlled Adhesives Based on Photoinduced Solid-to-Liquid Transition of an Azobenzene Compound

Mingsen Chen,Yuanli Liu,Si Wu,Xiaolei Zhao,Bing Niu

doi:10.1055/s-0040-1721756

Mingsen Chen, Yuanli Liu + Show 3 more

Open Access

https://doi.org/10.1055/s-0040-1721756

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Abstract

The development of photo-controlled adhesives can overcome the problems associated with daily lives and industrial applications. Adhesion is a multidiscipline field of engineering, physics, and chemistry. The solid-to-liquid transformation of light-controlled adhesives can be used for direct bonding onto diverse surfaces. Here, a photoresponsive azobenzene compound is developed for photo-controlled adhesion. The azobenzene compound 4, 4'-hexyl diacrylate-3-methylazobenzene (M1) exhibits photoinduced solid-to-liquid transition due to trans–cis photoisomerization. The prepolymer coating based on the azobenzene compound M1 is prepared on an adhesive surface. After UV irradiation, the solid coating was quickly transformed into liquid for adhesion. This photo-controlled adhesive has strong adhesion to different surfaces.

Highlights

Azobenzene is a switchable compound with reversible cis–trans photoisomerization abilities.[8]
Key words azobenzenes, photoinduced solid-to-liquid transition, prepolymer coating, photo-controlled adhesives noncontact stimulus response, cleanliness, and convenience of light energy, which will be the trend for the development of adhesives.[7]
Some azobenzene compounds are solids in the trans-state with a melting point higher than room temperature[13,14]; when irradiated with UV light, they can be transformed into liquids in the cis-state with a melting point lower than room temperature

Summary

Introduction

Azobenzene is a switchable compound with reversible cis–trans photoisomerization abilities.[8]. Key words azobenzenes, photoinduced solid-to-liquid transition, prepolymer coating, photo-controlled adhesives noncontact stimulus response, cleanliness, and convenience of light energy, which will be the trend for the development of adhesives.[7] Photoisomerization of some azobenzene small molecules can reversibly convert the compounds from solids to isotropic liquids.[15] In this study, a photoinduced solid–liquid transition adhesive prepolymer coating was prepared based on the special properties of azobenzene compounds.

Results

Conclusion