Abstract
Amorphous polyethylene terephthalate was oriented by cold rolling at room temperature on a lab-scale rolling mill. The compression of the polyethylene terephthalate film during the rolling gave rise to a system of shear bands. In plastic deformation of a polymer, a mechanical work is done, which is virtually completely converted to heat. Using a low-melting thermal indicator, it was shown that, during the cold rolling of amorphous polyethylene terephthalate, the temperature in the shear bands exceeds 95°C. Such strong self-heating of the polymer is possible if the compressive stress of the film between the rollers is approximately three times as high as the yield strength of the polymer. This is explained by the fact that the length of the film compression region is much larger than its thickness, and the friction forces between the rollers and the film lead to an increase in the yield strength.
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This work was supported under State assignment no. 0082-2019-0004, subject no. 44.6.
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Translated by V. Glyanchenko
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Bazhenov, S.L., Sosnovskii, I.V. & Kechek’yan, A.S. Self-Heating of Polyethylene Terephthalate in Shear Bands. Dokl Phys Chem 492, 57–59 (2020). https://doi.org/10.1134/S0012501620050012
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DOI: https://doi.org/10.1134/S0012501620050012