High strain-rate response of spiropyran mechanophores in PMMA
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Authors
Hemmer, J.R.
Smith, P.D.
van Horn, M.
Alnemrat, S.
Mason, B.P.
Read de Alaniz, J.
Osswald, S.
Hooper, J.P.
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2014
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Abstract
We report the high strain-rate response of a spiro-pyran (SP) mechanophore in poly(methylmethacrylate). Previ-ous work on this system has demonstrated a reversible bondscission in the SP under local tensile force, converting it to afluorescent merocyanine form. A Hopkinson bar was used toapply fast compressive loads at rates from 102to 104s21,resulting in significant activation of the SP near fracture surfa-ces. However, comparison with a similar thermochromic SPreveals that much of the observed activation likely arises fromthermal effects during high-rate fracture. These results showthe importance of a thermally active control system in distinguishing mechanochromic response during high-rate loading.
Microscale fluorescence mapping of the fracture surfaces using
a confocal Raman microspectrometer suggests that some dis-
tinct mechanical activation may be occurring in craze-like
regions during fibril rupture. The thermal response of the SP is
useful in its own right for characterizing plastic heating regions
during dynamic fracture.
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Article
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The article of record as published may be found at http://dx.doi.org/10.1002/polb.23569
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Physics
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J. R. Hemmer, P. D. Smith, M. van Horn, S. Alnemrat, B. P. Mason, J. Read de Alaniz, S. Osswald, and J. P. Hooper. “High strain-rate response of spiropyran mechanophores in PMMA. “J. Polym. Sci. B: Polym. Phys. 52, 1347 (2014).
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.