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Polymer Stability in Engines
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English
Abstract
Polymeric mineral oil additives are exposed to mechanical and thermo-oxidative degradation processes in the engine. For long lasting efficiency, they must show the highest possible stability to such attacks. The degradation processes are evident from and distinguishable by the molecular weight distribution of the polymer which can be measured with great accuracy by gel permeation chromatography (GPC), even for used oils. Results of such measurements are given for various types of VI improvers (polyalkyl methacrylates, ethylene-propylene copolymers and hydrogenated styrene-diene block copolymers) after exposure to Diesel and Otto engines. The influence of mechanical and thermo-oxidative degradation is discussed by means of model calculations. Comparative viscosity data elucidate the picture obtained from the distribution measurements.
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Citation
Wunderlich, W. and Jost, H., "Polymer Stability in Engines," SAE Technical Paper 780372, 1978, https://doi.org/10.4271/780372.Also In
References
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- Schodel U. Mineralöltechnik 22 1977 1
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- Wunderlich W. 1974 233