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Onset of Mechanochromic Response in the High Strain Rate Uniaxial Compression of Spiropyran Embedded Silicone Elastomers.

Publication ,  Journal Article
Shannahan, LS; Lin, Y; Berry, JF; Barbee, MH; Fermen-Coker, M; Craig, SL
Published in: Macromolecular rapid communications
January 2021

The molecular processes that accompany dynamic mechanical response to large deformations at high strain rate (≈1000 s-1 or higher) underlie the early stages of damage in materials, but understanding of material response in this regime is typically limited to macroscopic constitutive equations. Here, spiropyran mechanophores are embedded in very short, stress-bearing strands in silicone elastomers, and their mechanochromic response to uniaxial compression is explored in a Split Hopkinson Pressure (or Kolsky) Bar. At strain rates of 1000 s-1 , the onset of mechanochromism occurs at lower strains, but higher stresses, than in the same materials under quasi-static loading. Similar to quasi-static loading, however, a negligible effect of mechanophore structure on the critical strain for colorimetric onset is observed. The results suggest that nonequilibrium, inhomogeneous local tension distributions in the elastomers lead to greater stress in individual strands than at the same strains under equilibrium loading, but that within the regions of force concentration, mechanochromic onset is determined primarily by a limiting local strain threshold.

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Published In

Macromolecular rapid communications

DOI

EISSN

1521-3927

ISSN

1022-1336

Publication Date

January 2021

Volume

42

Issue

1

Start / End Page

e2000449

Related Subject Headings

  • Stress, Mechanical
  • Silicone Elastomers
  • Pressure
  • Polymers
  • Nitro Compounds
  • Materials Testing
  • Indoles
  • Benzopyrans
  • 40 Engineering
  • 34 Chemical sciences
 

Citation

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Shannahan, L. S., Lin, Y., Berry, J. F., Barbee, M. H., Fermen-Coker, M., & Craig, S. L. (2021). Onset of Mechanochromic Response in the High Strain Rate Uniaxial Compression of Spiropyran Embedded Silicone Elastomers. Macromolecular Rapid Communications, 42(1), e2000449. https://doi.org/10.1002/marc.202000449
Shannahan, Logan S., Yangju Lin, James F. Berry, Meredith H. Barbee, Müge Fermen-Coker, and Stephen L. Craig. “Onset of Mechanochromic Response in the High Strain Rate Uniaxial Compression of Spiropyran Embedded Silicone Elastomers.Macromolecular Rapid Communications 42, no. 1 (January 2021): e2000449. https://doi.org/10.1002/marc.202000449.
Shannahan LS, Lin Y, Berry JF, Barbee MH, Fermen-Coker M, Craig SL. Onset of Mechanochromic Response in the High Strain Rate Uniaxial Compression of Spiropyran Embedded Silicone Elastomers. Macromolecular rapid communications. 2021 Jan;42(1):e2000449.
Shannahan, Logan S., et al. “Onset of Mechanochromic Response in the High Strain Rate Uniaxial Compression of Spiropyran Embedded Silicone Elastomers.Macromolecular Rapid Communications, vol. 42, no. 1, Jan. 2021, p. e2000449. Epmc, doi:10.1002/marc.202000449.
Shannahan LS, Lin Y, Berry JF, Barbee MH, Fermen-Coker M, Craig SL. Onset of Mechanochromic Response in the High Strain Rate Uniaxial Compression of Spiropyran Embedded Silicone Elastomers. Macromolecular rapid communications. 2021 Jan;42(1):e2000449.
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

e2000449

Related Subject Headings

  • Stress, Mechanical
  • Silicone Elastomers
  • Pressure
  • Polymers
  • Nitro Compounds
  • Materials Testing
  • Indoles
  • Benzopyrans
  • 40 Engineering
  • 34 Chemical sciences