Correlation between the binding and associative strength of modified PIBSA-based dispersants

这一提议是表征的结合强度和结合强度由PIBSA制成的一系列分散剂。PIBSA是聚异丁烯链（PIB），一端以丁二酸酐（SA）终止。石油添加剂工业使用的PIBSA基分散剂是由PIBSA与多胺反应得到的。分散剂的PIB部分喜欢油，而多胺部分不喜欢。在石油中，分散剂可以通过其多胺核心结合成称为胶束的分散剂聚集体，或者与发动机产生的富含碳的颗粒结合。采用环碳酸酯或硼酸对pibsa基分散剂的多胺核进行改性，进一步调整其缔合性能。改性分散剂的结合强度将通过荧光测量确定的临界胶束浓度来估计。它们与富碳粒子的结合将用朗缪尔等温线来描述。分散剂结合成胶束与它们结合到富碳颗粒的极性表面之间存在的竞争将被研究。建立了分散剂的结合强度和结合强度之间的关系。从这些实验中获得的基本知识将使加拿大帝国石油公司受益，该公司销售用于石油配方的基于pibsa的石油添加剂。

This proposal is to characterize the associative and binding strength of a series of dispersants made from PIBSA. PIBSA are polyisobutylene chains (PIB) terminated at one end with succinic anhydride (SA). The PIBSA-based dispersants used by the oil-additive industry are obtained by reacting PIBSA with a polyamine. The PIB moiety of the dispersant likes the oil whereas the polyamine moiety does not. In the oil, the dispersants can either associate via their polyamine core into dispersant aggregates referred to as micelles, or bind onto carbon-rich particles generated by the engine. The polyamine core of the PIBSA-based dispersants will be modified with a cyclic carbonate or boric acid to further adjust their associative properties. The associative strength of the modified dispersants will be estimated from their critical micelle concentration determined by fluorescence measurements. Their binding onto carbon-rich particles will be described with a Langmuir isotherm. The competition existing between the association of the dispersants into micelles and their binding onto the polar surface of carbon-rich particles will be investigated. The correlation between the binding and associative strength of the dispersants will be established. The basic knowledge learned from these experiments will benefit Imperial Oil, a Canadian company selling PIBSA-based oil-additives used in oil formulations.