期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 140, 期 39, 页码 12388-12391出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b08908
关键词
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资金
- U.S. Army Research Office [W911NF-15-1-0525]
- National Science Foundation [ECCS-1542152]
- National Science Foundation
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 lambda >= 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.
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