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Wavelength-Dependent Dynamic Behavior in Thiol-Ene Networks Based on Disulfide Exchange. | LitMetric

AI Article Synopsis

  • Researchers developed a novel thiol-ene network that changes its properties based on the color of light used during the curing process, focusing on disulfide exchange reactions.
  • They synthesized transparent allyl-bearing disulfides that break down when exposed to 365 nm light, while remaining stable at 450 nm, allowing for controlled polymer behavior.
  • Depending on the curing wavelength, the resulting photopolymer exhibits either dynamic properties with disulfide bonds that relax over time or permanent links that retain their original structure, showcasing a simple method for tailoring polymer characteristics with light.

Article Abstract

While latent catalysts have become a well-established strategy for locally and temporally controlling bond exchange reactions in dynamic polymer networks, there is a lack of inherently tailorable systems. Herein, we introduce a thiol-ene network based on disulfide exchange that alters its dynamic properties as a function of the color of light used during the curing reaction. For this purpose, selected allyl-bearing disulfides are synthesized, which are transparent at 450 nm but undergo disulfide scission upon 365 nm light irradiation, as confirmed by UV-vis and EPR measurements. Incorporated into a thiol-ene resin, the wavelength used in the curing reaction defines the dynamic properties of the obtained photopolymer. At 450 nm, photocuring yields a dynamic network with disulfide bonds, which relaxes to 63% of its original stress within 112 s at 160 °C (without the requirement of an external catalyst). In contrast, curing with 365 nm light induces disulfide scission yielding photopolymers, which contain predominately monosulfidic links. The permanent nature of the links effectively prevents relaxation of the polymer within a reasonable period of time, confirming the successful alteration of its dynamic properties simply by the color of the light source used.

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Source
http://dx.doi.org/10.1021/jacs.4c13735DOI Listing

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