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The influence of chemical composition on the pour‐point depressant properties of methacrylate copolymers used as additives for lubricating oils
Author(s) -
Florea M.,
Catrinoiu Doina,
Luca Paul,
Balliu S.
Publication year - 1999
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010120103
Subject(s) - pour point , methacrylate , depressant , copolymer , alkyl , viscosity index , chemistry , polymer , polymer chemistry , organic chemistry , styrene , polybutadiene , viscosity , base oil , materials science , composite material , medicine , scanning electron microscope , pharmacology
Abstract Methacrylate polymers are much used as additives in lubricating oils, as pour‐point depressants and viscosity index improvers. Although the mechanism of such pour‐point depression is still controversial, it is thought to be related to the length of the alkyl side chains of the polymethacrylates, and to the nature of the base oil. In this paper, work is reported on: (a) the depressant activity of polymethacrylate copolymers in relation to the content of short alkyl methacrylates and styrene, and the average side‐chain length of the basic methacrylate constituents; (b) the pour point of the base stock; and (c) the additive concentration.

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