Lubricating motor oils intended for use in internal combustion engines are typically formulated with a variety of additives intended to aid in the reduction of corrosion, deposit formation, wear, etc. One type of additive is ashless dispersants, typically represented by polyisobutylene succinimde (PIBSI), whose role is to regulate viscosity increases due to the formation and presence of soot. Soot is produced by the incomplete combustion of fuel. Rather than the traditional linear diblock arcitecture of PIBSI, grafted PIBSI dispersants (PolyPIBSI) were prepared by the copolymerization of vinyl ether-terminated polyisobutylene (PIB) with maleic anhydride followed by imidization with tetraethylenepentamine and were characterized by proton nuclear magnetic resonance spectroscopy, gel permeation chromatography, and infrared spectroscopy. PolyPIBSI dispersants with PIB tails of 288, 1,250, and 2,620 g*mol<sup>-1</sup> were prepared where it was found that increasing the PIB tail length increased solubility in non-polar media but limited the degree of polymerization of the dispersants. Characterization of the viscosity characteristics of PolyPIBSI dispersants with 2,650 g*mol<sup>-1</sup> PIB tails was performed at various loadings in the presence of carbon black. It was found that the viscosity of the solution decreased until 2.5 wt% dispersant upon which increased loadings yielded higher viscosities.

Synthesis and dispersancy of motor oil dispersants with comb-like architecture

253rd National Meeting (2017)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.