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Molecular Damage Detection in an Elastomer Nanocomposite with a Coumarin Dimer Mechanophore.

Publication ,  Journal Article
Zhang, Y; Lund, E; Gossweiler, GR; Lee, B; Niu, Z; Khripin, C; Munch, E; Couty, M; Craig, SL
Published in: Macromolecular rapid communications
January 2021

Molecular force probes that generate optical responses to critical levels of mechanical stress (mechanochromophores) are increasingly attractive tools for identifying molecular sites that are most prone to failure. Here, a coumarin dimer mechanophore whose mechanical strength is comparable to that of the sulfur-sulfur bonds found in vulcanized rubbers is reported. It is further shown that the strain-induced scission of the coumarin dimer within the matrix of a particle-reinforced polybutadiene-based co-polymer can be detected and quantified by fluorescence spectroscopy, when cylinders of the nanocomposite are subjected to unconstrained uniaxial stress. The extent of the scission suggests that the coumarin dimers are molecular "weak links" within the matrix, and, by analogy, sulfur bridges are likely to be the same in vulcanized rubbers. The mechanophore is embedded in polymer main chains, grafting agent, and cross-linker positions in a polymer composite in order to generate experimental data to understand how macroscopic mechanical stress is transferred at the molecular scale especially in highly entangled cross-linked polymer nanocomposite. Finally, the extent of activation is enhanced by approximately an order of magnitude by changing the regiochemistry and stereochemistry of the coumarin dimer and embedding the mechanophore at the heterointerface of the particle-reinforced elastomer.

Duke Scholars

Published In

Macromolecular rapid communications

DOI

EISSN

1521-3927

ISSN

1022-1336

Publication Date

January 2021

Volume

42

Issue

1

Start / End Page

e2000359

Related Subject Headings

  • Stress, Mechanical
  • Polymers
  • Polymers
  • Nanocomposites
  • Elastomers
  • Coumarins
  • 40 Engineering
  • 34 Chemical sciences
  • 09 Engineering
  • 03 Chemical Sciences
 

Citation

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Chicago
ICMJE
MLA
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Zhang, Y., Lund, E., Gossweiler, G. R., Lee, B., Niu, Z., Khripin, C., … Craig, S. L. (2021). Molecular Damage Detection in an Elastomer Nanocomposite with a Coumarin Dimer Mechanophore. Macromolecular Rapid Communications, 42(1), e2000359. https://doi.org/10.1002/marc.202000359
Zhang, Yudi, Ethen Lund, Gregory R. Gossweiler, Bobin Lee, Zhenbin Niu, Constantine Khripin, Etienne Munch, Marc Couty, and Stephen L. Craig. “Molecular Damage Detection in an Elastomer Nanocomposite with a Coumarin Dimer Mechanophore.Macromolecular Rapid Communications 42, no. 1 (January 2021): e2000359. https://doi.org/10.1002/marc.202000359.
Zhang Y, Lund E, Gossweiler GR, Lee B, Niu Z, Khripin C, et al. Molecular Damage Detection in an Elastomer Nanocomposite with a Coumarin Dimer Mechanophore. Macromolecular rapid communications. 2021 Jan;42(1):e2000359.
Zhang, Yudi, et al. “Molecular Damage Detection in an Elastomer Nanocomposite with a Coumarin Dimer Mechanophore.Macromolecular Rapid Communications, vol. 42, no. 1, Jan. 2021, p. e2000359. Epmc, doi:10.1002/marc.202000359.
Zhang Y, Lund E, Gossweiler GR, Lee B, Niu Z, Khripin C, Munch E, Couty M, Craig SL. Molecular Damage Detection in an Elastomer Nanocomposite with a Coumarin Dimer Mechanophore. Macromolecular rapid communications. 2021 Jan;42(1):e2000359.
Journal cover image

Published In

Macromolecular rapid communications

DOI

EISSN

1521-3927

ISSN

1022-1336

Publication Date

January 2021

Volume

42

Issue

1

Start / End Page

e2000359

Related Subject Headings

  • Stress, Mechanical
  • Polymers
  • Polymers
  • Nanocomposites
  • Elastomers
  • Coumarins
  • 40 Engineering
  • 34 Chemical sciences
  • 09 Engineering
  • 03 Chemical Sciences