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Degradation Pattern of Polymeric Viscosity Index Improvers in Cross-Graded Engine Lubricants
Technical Paper
2001-28-0038
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SIAT 2001
Language:
English
Abstract
Polymeric VI improvers of cross-graded engine lubricants are prone for degradation due to both mechanical and thermal shearing. However, till now, all the engine oil specifications focus only on their resistance towards mechanical degradation. In the present study, an attempt has been made to assess the extent of polymeric degradation due to thermal shearing by using some commonly employed polymeric VI improvers and their combinations. Data generated in mechanical and thermal shearing experiments has been correlated with high temperature high shear (HT-HS) viscosity data of these sheared and unsheared oils. All these findings are further augmented by comparing relative changes in their molecular weights and molecular weight distribution profile, as obtained by gel permeation chromatographic analysis of the experimental oils.
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Authors
- S.S.V. Ramakumar - Indian Oil Corporation Limited, Research and Development Center, Sector-13, Faridabad-121 007, India
- V. Kagdiyal - Indian Oil Corporation Limited, Research and Development Center, Sector-13, Faridabad-121 007, India
- O.P. Tiwari - Indian Oil Corporation Limited, Research and Development Center, Sector-13, Faridabad-121 007, India
- A. Chopra - Indian Oil Corporation Limited, Research and Development Center, Sector-13, Faridabad-121 007, India
- A.M. Rao - Indian Oil Corporation Limited, Research and Development Center, Sector-13, Faridabad-121 007, India
- A.S. Sarpal - Indian Oil Corporation Limited, Research and Development Center, Sector-13, Faridabad-121 007, India
- A.K. Bhatnagar - Indian Oil Corporation Limited, Research and Development Center, Sector-13, Faridabad-121 007, India
Topic
Citation
Ramakumar, S., Kagdiyal, V., Tiwari, O., Chopra, A. et al., "Degradation Pattern of Polymeric Viscosity Index Improvers in Cross-Graded Engine Lubricants," SAE Technical Paper 2001-28-0038, 2001, https://doi.org/10.4271/2001-28-0038.Also In
References
- Ono, Satoru Kurimoto Kawachi Toshiaki “Properties of Engine Bearings Lubricated with low HT-HS viscosity oil” SAE 980702
- Tsergounis Spyros Mc Millan Michael Olree Robert “Engine oil Effects on Fuel Economy in GM Vehicles-Separation of Viscosity and Friction Modifier Effects” SAE 98 2502 , SP-1404
- Devlin Mark T. Lam W.Y. Mc Donell T.F. “Comparison of the physical and chemical changes occurring in oils during Aging in vehicle and engine fuel economy tests” SAE 982504
- Devilin M.T. Greene Susan V. Wooton D.L. “Molecular Changes to Polymeric additives occurring During Fuel Economy Aging Tests” SAE 982507
- Covitch M.J. “How Polymer Architecture Affects permanent Vsicoity Loss of Multigrade Lubricants” SAE 982638