Summary
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1.
At temperatures from 0 to 110°C, the rate and severity of polyisobutene breakdown is inversely proportional to temperature and is caused primarily by the action of mechanical stresses on the polymer.
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2.
With further increases in temperature, from 110 to 175°C, breakdown is proportional to temperature and is governed by two factors — mechanical stresses and thermal motion of the polymer molecules. At 175°C, thermal breakdown is highly significant, amounting to about 46% of the total breakdown after 36 h of operation of the reducer.
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3.
The most favorable operating conditions for a thickened oil in a gear reducer are found at temperatures from 65 to 130–140°C.
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Literature cited
G. I. Kichkin and P. P. Zasal'ko, Khim. i Tekhnol. Topliv i Masel, No. 12 (1967).
V. R. Regel', T. M. Muinov, and O. F. Pozdnyakov, Fiz. Tverdogo Tela,4, No. 9 (1962).
N. K. Baramboim and V. V. Anokhin, Physics and Chemistry of Polymeric Materials [in Russian], Gostekhizdat UkrSSR (1961), p. 159.
SAE Preprints, No. 680070 (1968).
E. Koch, Erdöl und Kohle, No. 11, 793–796 (1955).
Additional information
Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 12, pp. 46–48, December, 1971.
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Kichkin, G.I., Zaskal'ko, P.P. & Almazov, O.A. Effect of temperature on breakdown of polyisobutene dissolved in mineral oil. Chem Technol Fuels Oils 7, 944–947 (1971). https://doi.org/10.1007/BF00716592
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DOI: https://doi.org/10.1007/BF00716592