Synthesis and characterization of modified polyisobutylene-based dispersants from polyisobutylene succinimides

In this study, Alkenyl succinimides with different alkyl chain lengths were synthesized using polyisobutylene (PIB) with the molecular weights of 1000 and 1300, which displayed the best functional properties. The secondary amines found in b-Polyisobutylene succinimide (b-PIBSI) dispersants were prepared by attaching PIB chains to a polyamine core via two succinimide moieties. In this work, detergent/dispersant type additives were synthesized based on polyisobutylene succinic anhydride (PIBSA) and its aminated compounds (PIBSI) with tetraethylenepentamine (TEPA). The resulting PIBSA and PIBSI characterized by Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance (H-1-NMR), and gel permeation chromatography (GPC) spectroscopies were greatly complicated because of the interactions between the carbonyls of the succinimide groups and unreacted secondary amines of the Mb-PIBSI dispersants. The viscoelasticity of obtained PIBSI indicated the increase in storage modulus with time which illustrated the increase in the solid-like properties of PIBSI. Therefore, an alternative procedure was developed based on fluorescence quenching of the succinimides by secondary amines and urethane groups.

Automated summary

In this study, Alkenyl succinimides with different alkyl chain lengths were synthesized using polyisobutylene (PIB) of varying molecular weights, which exhibited the best functional properties. Detergent/dispersant type additives were prepared based on polyisobutylene succinic anhydride (PIBSA) and its aminated compounds (PIBSI) with tetraethylenepentamine (TEPA), and characterized by various spectroscopic techniques.