Synthesis and Mechanochemical Activation of Ladderene–Norbornene Block Copolymers

We have recently reported a polymechanophore system, polyladderene (PLDE), which dramatically transforms into polyacetylene (PA) upon mechanical stimulation. Herein, we optimized conditions to synthesize unprecedented block copolymers (BCPs) containing a force-responsive block by sequential ring-ope...

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Veröffentlicht in:Journal of the American Chemical Society 2018-10, Vol.140 (39), p.12388-12391
Hauptverfasser: Su, Jessica K, Feist, John D, Yang, Jinghui, Mercer, Jaron A. M, Romaniuk, Joseph A. H, Chen, Zhixing, Cegelski, Lynette, Burns, Noah Z, Xia, Yan
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Sprache:eng
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Zusammenfassung:We have recently reported a polymechanophore system, polyladderene (PLDE), which dramatically transforms into polyacetylene (PA) upon mechanical stimulation. Herein, we optimized conditions to synthesize unprecedented block copolymers (BCPs) containing a force-responsive block by sequential ring-opening metathesis polymerization of different norbornenes and bromoladderene. Successful extension from PLDE to other blocks required careful timing and low temperatures to preserve the reactivity of the PLDE-appended catalyst. The PLDE-containing BCPs were sonochemically activated into visually soluble PA with a maximum absorption λ ≥ 600 nm and unique absorption patterns corresponding to noncontinuous activation of ladderene units. Access to polymechanophore BCPs paves the way for new stress-responsive materials with solution and solid state self-assembly behaviors and incorporation of polymechanophores into other materials.
ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.8b08908