Characterization of the Polar Core of PIBSI-Polyamine Dispersants by Pyrene Excimer Formation (PEF)

A polyisobutylene sample terminated with a succinic anhydride (PIBSA) was modified via succinimide formation with diethylenetriamine (DETA), triethylenetetramine (TETA), and tetraethylenepentamine (TEPA) either alone or as an equimolar mixture of DETA and TETA to form either mono-(m-) or bis-(b-) PIBSI-polyamines (PIBSI-PA). The residual free amines of the PIBSI-PA samples were labeled with 1-pyrenebutyric acid to enhance the signal and characterize the conformation of the small polyamine segmen