Stressed polymer film, colorfully detected before gel breaks

Stretchable films and squeeze gels help achieve wearable electronics, soft robotics, and biocompatible tissue. However, if the force is too strong, these polymers can decompose without warning.To detect stress before it’s too late, researchers Journal of the American Chemical Society It indicates that we have designed a compound with “wings” that change color when these materials are stretched or crushed.

With a film like plastic Polymer gel— Soft 3D network filled with liquid — bendable, stretchable and compressible.And most polymer movie It will only fall apart if you pull it too much. Many gels are not very strong and will crack with a relatively small amount of pressure. However, there is no way to predict how durable a sponge-like material will be. In a previous study, Shohei Saito developed a V-shaped molecule known as the flapping molecule (FLAP) force probe. The flap has two wing-like side structures that flatten when pressure is applied. Change color From blue Green fluorescence.. The probe worked as expected when incorporated into a polyurethane film, but when applied to a polymer gel soaked in a liquid, the compound spontaneously turned fluorescent green without external force. Therefore, Saito and Takuya Yamamon set out to improve the FLAP molecule so that the mechanical stress of both the polymer gel and the film could be detected accurately.

Researchers modified the previous version by replacing the two anthracene wing with a pyrene imide wing and attaching it to the opposite side of the same flexible central cyclooctatetraene joint. When they added the probe to the polymer film and stretched the material, its fluorescence strongly shifted from blue to green. There was also a change in color that was visible to the naked eye.Next, researchers have a new FLAP probe Organic solvent, Create a yellow cylinder that fluoresces in blue and compresses the material. With more pressure applied, the fluorescence of the cylinder turned measurable green. In their final test, researchers placed the metal letter FLAP on a rectangular block of gel. They used a map of green and blue fluorescence ratios to calculate the pressure each letter in the range 0 to 1 MPa puts on the gel below. Researchers say this study could help develop stronger gel materials and nanoscale tension probes for cell membranes.

A new fluorescent hydrogel for soft, biomimetic color-changing skins

For more information:
Takuya Yamamon et al., Ratiometric flapping force probe that works with polymer gels, Journal of the American Chemical Society (2022). DOI: 10.1021 / jacs.1c12955

Quote: Stressed polymer film, colorfully detected gel before breaking (February 23, 2022), https: // Obtained February 23, 2022 from .html

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Stressed polymer film, colorfully detected before gel breaks

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