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Is Molecular Weight or Degree of Polymerization a Better Descriptor of Ultrasound-Induced Mechanochemical Transduction?

May, Preston A. and Munaretto, Nicholas F. and Hamoy, Michael B. and Robb, Maxwell J. and Moore, Jeffrey S. (2016) Is Molecular Weight or Degree of Polymerization a Better Descriptor of Ultrasound-Induced Mechanochemical Transduction? ACS Macro Letters, 5 (2). pp. 177-180. ISSN 2161-1653. https://resolver.caltech.edu/CaltechAUTHORS:20180606-150532918

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Abstract

A detailed understanding of the fundamental processes that govern mechanical transduction in covalent polymer mechanochemistry is essential to advance innovation in this field. In contrast to progress in the development of new mechanophores, the influence of polymer structure and composition on mechanochemical activity has received relatively little attention. In order to address this gap in knowledge, a continuous flow system with synchronous UV–vis absorption capabilities was designed to quantify the ultrasound-induced mechanical activation of a spiropyran mechanophore in real-time. Measurements of reaction kinetics with polymer tethers of varying repeating unit structure demonstrate that degree of polymerization is the key descriptor of mechanochemical activity, independent of molecular weight and pendant group constitution. These results have important implications for the rationalization of mechanochemical properties and the design of new mechanochemically active polymer systems.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/acsmacrolett.5b00855DOIArticle
https://pubs.acs.org/doi/suppl/10.1021/acsmacrolett.5b00855PublisherSupporting Information
ORCID:
AuthorORCID
Robb, Maxwell J.0000-0002-0528-9857
Additional Information:© 2016 American Chemical Society. CS Editors' Choice - This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes. Received: November 25, 2015. Accepted: January 7, 2016. Published: January 17, 2016. This work was supported in part by the National Science Foundation (DMR 1307354) and a ARO MURI (W911NF-07-1-0409). The authors thank Dr. Charles Diesendruck, Dr. Matt Kryger, and Dr. Koushik Ghosh for helpful discussions and Dorothy Loudermilk for assistance with graphics. M.J.R. gratefully acknowledges the Arnold and Mabel Beckman Foundation for a Beckman Institute Postdoctoral Fellowship. The authors declare no competing financial interest.
Funders:
Funding AgencyGrant Number
NSFDMR-1307354
Army Research Office (ARO)W911NF-07-1-0409
Arnold and Mabel Beckman FoundationUNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20180606-150532918
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180606-150532918
Official Citation:Is Molecular Weight or Degree of Polymerization a Better Descriptor of Ultrasound-Induced Mechanochemical Transduction? Preston A. May, Nicholas F. Munaretto, Michael B. Hamoy, Maxwell J. Robb, and Jeffrey S. Moore ACS Macro Letters 2016 5 (2), 177-180 DOI: 10.1021/acsmacrolett.5b00855
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86856
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:07 Jun 2018 15:29
Last Modified:03 Oct 2019 19:49

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