Design of an Azopolymer for Photo-Switchable Adhesive Applications - Institut de Recherche Dupuy de Lôme - CNRS FRE 3744 Access content directly
Journal Articles Coatings Year : 2024

Design of an Azopolymer for Photo-Switchable Adhesive Applications


Significant research endeavors have been devoted to developing adhesives with reversible switching capabilities, allowing them to activate adhesion in response to diverse environmental stimuli. Among these, photo-switchable adhesives stand out as particularly promising. The presence of a photo-reversible solid-to-liquid transition, characterized by a transition temperature (TSL), in certain azobenzene-containing polymers offers a compelling avenue for creating such adhesives. The development of a method based on Atomic Force Microscopy to measure both the glass transition temperature (Tg) and TSL provided an opportunity to investigate the impact of various structural parameters on the solid-to-liquid transition of azopolymers. Our findings revealed that increasing the molecular weight (Mn) from 3400 to 8100 g/mol needed to achieve a highly cohesive adhesive resulted in an elevation in TSL (>10 °C), making the solid-to-liquid transition at room temperature more challenging. However, incorporating a highly flexible substituent at the para position of the azobenzene group proved effective in significantly reducing the TSL value (from 42 °C to 0 °C). This approach allows for the creation of photo-switchable adhesives with intriguing properties. We believe that our results establish a pathway toward developing a robust room-temperature photo-switchable adhesive.
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hal-04513596 , version 1 (26-03-2024)



David Siniscalco, Laurence Pessoni, Anne Boussonniere, Anne-Sophie Castanet, Laurent Billon, et al.. Design of an Azopolymer for Photo-Switchable Adhesive Applications. Coatings, 2024, 14 (3), pp.275. ⟨10.3390/coatings14030275⟩. ⟨hal-04513596⟩
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