《Photodynamic Control of the Chain Length in Supramolecular Polymers: Switching an Intercalator into a Chain Capper》 was written by Weyandt, Elisabeth; ter Huurne, Gijs M.; Vantomme, Ghislaine; Markvoort, Albert J.; Palmans, Anja R. A.; Meijer, E. W.. SDS of cas: 26153-38-8 And the article was included in Journal of the American Chemical Society in 2020. The article conveys some information:
Supramol. systems are intrinsically dynamic and sensitive to changes in mol. structure and external conditions. Because of these unique properties, strategies to control polymer length, composition, comonomer sequence, and morphol. have to be developed for sufficient control over supramol. copolymerizations We designed photoresponsive, mono acyl hydrazone functionalized benzene-1,3,5-tricarboxamide (m-BTA) monomers that play a dual role in the coassembly with achiral alkyl BTAs (a-BTA). In the E isomer form, the chiral m-BTA monomers intercalate into stacks of a-BTA and dictate the chirality of the helixes. Photoisomerization to the Z isomer transforms the intercalator into a chain capper, allowing dynamic shortening of chain length in the supramol. aggregates. We combine optical spectroscopy and light-scattering experiments with theor. modeling to show the reversible decrease in length when switching from the E to Z isomer of m-BTA in the copolymer with inert a-BTA. With a mass-balance thermodn. model, we gain addnl. insights into the composition of copolymers and length distributions of the species over a broad range of concentrations and mixing ratios of a-BTA/m-BTA. Moreover, the model was used to predict the impact of an additive (chain capper and intercalator) on the chain length over a range of concentrations, showing a remarkable amplification of efficiency at high concentrations By employing a stimuli-responsive comonomer in a mostly inert polymer, we can cooperatively amplify the effect of the switching and obtain photocontrol of polymer length. Moreover, this dynamic decrease in chain length causes a macroscopic gel-to-sol phase transformation of the copolymer gel, although 99.4% of the organogel is inert to the light stimulus. In the experiment, the researchers used many compounds, for example, 3,5-Dihydroxybenzaldehyde(cas: 26153-38-8SDS of cas: 26153-38-8)
3,5-Dihydroxybenzaldehyde(cas: 26153-38-8) is used as a building block in the synthesis of more complex structures. It is also used in the synthesis of terbutaline, which is an important bronchodilator.SDS of cas: 26153-38-8
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