Objective: The article investigates the performance of homopolymer of castor oil and its four
copolymers with methyl methacrylate (MMA), dodecyl acrylate (DDA), 1- decene (1-D) and styrene
(ST) as biodegradable multifunctional additive in the formulation of eco-friendly lubricant.
Method: Homopolymer of castor oil (CO) and its copolymers with 10% (w/w) of each of the comonomers
were synthesized using azobisisobutyronitrile (AIBN) as initiator. The polymers were characterized
by spectral techniques (FT-IR and NMR spectroscopy). The molecular weight of all the prepared
polymers was determined by Gel Permeation Chromatography (GPC).
Result: The thermal stability of the polymers was determined by thermo gravimetric analysis (TGA).
Performance evaluation of all the prepared polymers in two different of mineral base oils as viscosity
index improver (VII), pour point depressant (PPD) and antiwear was carried out according to standard
ASTM methods. Biodegradability of all the samples was tested through soil burial test (SBT) method.
Keywords: Castor oil, homopolymer, copolymer, viscosity index improver, pour point depressant, antiwear,
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