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Mechanical Reactivity of Two Different Spiropyran Mechanophores in Polydimethylsiloxane

Kim, Tae Ann and Robb, Maxwell J. and Moore, Jeffrey S. and White, Scott R. and Sottos, Nancy R. (2018) Mechanical Reactivity of Two Different Spiropyran Mechanophores in Polydimethylsiloxane. Macromolecules, 51 (22). pp. 9177-9183. ISSN 0024-9297.

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We investigate the effect of pulling point location on the mechanochemical activation of two isomers of spiropyran in cross-linked polymeric materials through computational calculations and in situ fluorescence measurements. The threshold stress and strain required to activate the spiropyran mechanophores under tensile load are characterized. For both spiropyran isomers, applied stress favors the activated merocyanine states; however, despite differences in mechanochemical behavior predicted by quantum chemical calculations and previous single molecule experiments, both spiropyran isomers exhibit similar mechanochemical reactivity in bulk polymeric materials. The kinetics of the spiropyran–merocyanine transition under different tensile stresses are also examined. Overall, we find that varying the pulling geometry on the spiropyran mechanophore has only a minimal effect on the mechanical activation in bulk polymeric materials due to the complex nature of the macroscopic system.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Kim, Tae Ann0000-0002-1084-638X
Robb, Maxwell J.0000-0002-0528-9857
White, Scott R.0000-0002-0831-9097
Sottos, Nancy R.0000-0002-5818-520X
Additional Information:© 2018 American Chemical Society. Received: September 5, 2018; Revised: October 26, 2018; Published: November 8, 2018. This work was supported in part by the National Science Foundation (DMR 1307354). T.A.K. thanks the Kwanjeong Educational foundation for a fellowship. M.J.R. gratefully acknowledges the Arnold and Mabel Beckman Foundation for a Beckman Institute Postdoctoral Fellowship and startup funds from Caltech. The authors declare no competing financial interest.
Funding AgencyGrant Number
Kwanjeong Educational FoundationUNSPECIFIED
Arnold and Mabel Beckman FoundationUNSPECIFIED
Issue or Number:22
Record Number:CaltechAUTHORS:20181108-133632356
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Official Citation:Mechanical Reactivity of Two Different Spiropyran Mechanophores in Polydimethylsiloxane. Tae Ann Kim, Maxwell J. Robb, Jeffrey S. Moore, Scott R. White, and Nancy R. Sottos. Macromolecules 2018 51 (22), 9177-9183. DOI: 10.1021/acs.macromol.8b01919
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90760
Deposited By: Tony Diaz
Deposited On:09 Nov 2018 04:09
Last Modified:03 Oct 2019 20:28

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