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A Mechanochemical Reaction Cascade for Controlling Load‐Strengthening of a Mechanochromic Polymer
We demonstrate an intermolecular reaction cascade to control the force which triggers crosslinking of a mechanochromic polymer of spirothiopyran (STP). Mechanochromism arises from rapid reversible force‐sensitive isomerization of STP to a merocyanine, which reacts rapidly with activated C=C bonds. T...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7756483/ https://www.ncbi.nlm.nih.gov/pubmed/32827332 http://dx.doi.org/10.1002/anie.202010043 |
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author | Pan, Yifei Zhang, Huan Xu, Piaoxue Tian, Yancong Wang, Chenxu Xiang, Shishuai Boulatov, Roman Weng, Wengui |
author_facet | Pan, Yifei Zhang, Huan Xu, Piaoxue Tian, Yancong Wang, Chenxu Xiang, Shishuai Boulatov, Roman Weng, Wengui |
author_sort | Pan, Yifei |
collection | PubMed |
description | We demonstrate an intermolecular reaction cascade to control the force which triggers crosslinking of a mechanochromic polymer of spirothiopyran (STP). Mechanochromism arises from rapid reversible force‐sensitive isomerization of STP to a merocyanine, which reacts rapidly with activated C=C bonds. The concentration of such bonds, and hence the crosslinking rate, is controlled by force‐dependent dissociation of a Diels–Alder adduct of anthracene and maleimide. Because the adduct requires ca. 1 nN higher force to dissociate at the same rate as that of STP isomerization, the cascade limits crosslinking to overstressed regions of the material, which are at the highest rate of material damage. Using comb polymers decreased the minimum concentration of mechanophores required to crosslinking by about 100‐fold compared to previous examples of load‐strengthening materials. The approach described has potential for controlling a broad range of reaction sequences triggered by mechanical load. |
format | Online Article Text |
id | pubmed-7756483 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-77564832020-12-28 A Mechanochemical Reaction Cascade for Controlling Load‐Strengthening of a Mechanochromic Polymer Pan, Yifei Zhang, Huan Xu, Piaoxue Tian, Yancong Wang, Chenxu Xiang, Shishuai Boulatov, Roman Weng, Wengui Angew Chem Int Ed Engl Communications We demonstrate an intermolecular reaction cascade to control the force which triggers crosslinking of a mechanochromic polymer of spirothiopyran (STP). Mechanochromism arises from rapid reversible force‐sensitive isomerization of STP to a merocyanine, which reacts rapidly with activated C=C bonds. The concentration of such bonds, and hence the crosslinking rate, is controlled by force‐dependent dissociation of a Diels–Alder adduct of anthracene and maleimide. Because the adduct requires ca. 1 nN higher force to dissociate at the same rate as that of STP isomerization, the cascade limits crosslinking to overstressed regions of the material, which are at the highest rate of material damage. Using comb polymers decreased the minimum concentration of mechanophores required to crosslinking by about 100‐fold compared to previous examples of load‐strengthening materials. The approach described has potential for controlling a broad range of reaction sequences triggered by mechanical load. John Wiley and Sons Inc. 2020-09-25 2020-12-01 /pmc/articles/PMC7756483/ /pubmed/32827332 http://dx.doi.org/10.1002/anie.202010043 Text en © 2020 The Authors. Published by Wiley-VCH GmbH This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Communications Pan, Yifei Zhang, Huan Xu, Piaoxue Tian, Yancong Wang, Chenxu Xiang, Shishuai Boulatov, Roman Weng, Wengui A Mechanochemical Reaction Cascade for Controlling Load‐Strengthening of a Mechanochromic Polymer |
title | A Mechanochemical Reaction Cascade for Controlling Load‐Strengthening of a Mechanochromic Polymer |
title_full | A Mechanochemical Reaction Cascade for Controlling Load‐Strengthening of a Mechanochromic Polymer |
title_fullStr | A Mechanochemical Reaction Cascade for Controlling Load‐Strengthening of a Mechanochromic Polymer |
title_full_unstemmed | A Mechanochemical Reaction Cascade for Controlling Load‐Strengthening of a Mechanochromic Polymer |
title_short | A Mechanochemical Reaction Cascade for Controlling Load‐Strengthening of a Mechanochromic Polymer |
title_sort | mechanochemical reaction cascade for controlling load‐strengthening of a mechanochromic polymer |
topic | Communications |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7756483/ https://www.ncbi.nlm.nih.gov/pubmed/32827332 http://dx.doi.org/10.1002/anie.202010043 |
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