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

这项建议是为了表征由PIBSA制成的一系列分散剂的缔合和结合强度。PIBSA是一端以琥珀酸酐(SA)封端的聚异丁烯链(PIB)。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。在油中，分散剂可以通过其多胺核结合成称为胶束的分散剂聚集体，或者结合到发动机产生的富碳颗粒上。以PIBSA为基础的分散剂的多胺核将被环状碳酸酯或硼酸修饰，以进一步调整其缔合性能。改性分散剂的缔合强度将通过荧光测量确定的临界胶束浓度来估计。它们与富碳颗粒的结合可用朗缪尔等温式描述。将研究分散剂与胶束的结合和它们与富碳颗粒的极性表面的结合之间存在的竞争。将建立分散剂的结合强度和缔合强度之间的关联。从这些实验中学到的基本知识将使帝国石油公司受益，该公司是一家加拿大公司，销售用于石油配方中的基于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.