A writable aniline‐functionalized polydiacetylene composite with obvious colorimetric change upon both heating and near infrared lights irradiation

Abstract

Due to the unique optical and chromatic properties toward various external stimuli, conjugated polydiacetylene (PDA) materials are attracting a great attention from scientists. And the fabrication of PDA embedded composites would further expand the application prospect. In this work, aniline substituted diacetylene derivative was embedded into wax matrix to form a writable composite. After UV induced 1,4-topochemical polymerization, the patterns generated from the PDA/wax composite showed clearly a blue-to-purple-to-red colorimetric change upon thermal stimulus. More interestingly, with the introduction of two representative near-infrared (NIR) dyes to the composite, the PDA also showed blue-to-red chromatic transition in response to distinctive NIR lights irradiation.

Distinctive Colorimetric Response of Benzaldehyde Substituted Polydiacetylene Vesicle to Temperature, pH, and Organic Amines

“…As a reference, both our group and others have reported that the aniline substituted PCDA (PCDA-AN) showed a poor thermal stability and completely irreversible thermochromism after photopolymerization (Scheme S2, Supporting Information). [24,25] Besides, because of the absence of hydrophilic head group, PCDA-AN could not form vesicle in aqueous solution. [26] And in this work the introduction of benzaldehyde group is anticipated to bring in a stronger intermolecular interaction among polymer side chains and lead to a more stable thermal responsive behavior for PDA.…”