Fabrication of Photoprocessable Materials via Photopolymerization Using an Acid‐Induced Photocleavable Platinum‐Acetylide Crosslinker

Photopolymerization and photoprocessing are core technologies for molding and tuning polymer materials. However, they are incompatible with single materials owing to their contradictory photoreactivity. Herein, an acid‐induced photocleavable crosslinker, a platinum–acetylide complex covered by permethylated cyclodextrins, enables the fabrication of photoprocessable materials via photopolymerization with N‐(2‐hydroxyethyl)acrylamide. The polymer networks are molded by 365 nm irradiation as well as softened and degraded by a cooperative reaction with HCl as an acidic additive under 365 nm UV light, or 470 nm visible light in the presence of a photosensitizer. Moreover, the crosslinker is applied to a photoadhesive triggered by 365 nm irradiation. The adhesion is detachable on‐demand through acid‐induced photodegradation with the same wavelength and intensity of irradiation. Thus, acid‐induced photocleavage allows the integration of light‐induced molding and processing under various lights of various wavelengths, opening up new strategies for polymer technologies. Photopolymerization and photoprocessing are core technologies for the precise molding and tuning of polymer materials; however, they are incompatible with single materials because of their conflicting reactivity. Herein, the acid‐induced photocleavage of a platinum–acetylide crosslinker allows the fabrication of materials via photopolymerization with 365‐nm UV light as well as photoprocessing with 365‐nm UV light under acidic conditions.