الفهرس 
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Abstract
In this work N-decyl- (C10P), N-dodecyl- (C12P)and N-cetyl- 2-aminopyridinum (C16P) oligomers were synthesized by chemical oxidative polymerization of N- decyl- (C10), N-dodecyl- (C12) and N-cetyl-2-aminopyridinium bromide monomers respectively in aqueous acid medium. The density function theory (DFT) was applied to recognize the reactive center in monomers used. The result of quantum calculations indicated that the oligomerization could proceed via open ring reaction. The chemical structure of the obtained oligomers was confirmed using GPC, FTIR and 1HNMR spectroscopy. In addition, the XRD and SEM were used to investigate the morphology of the prepared oligomers. The thermal stability of the obtained oligomers was followed by thermogravimetric analysis (TGA). The conversion of these oligomers is ranged from 61 to 68% and the weight average molecular weights are closed to 3000 g mol-1. The surface and interfacial tension of the synthesized oligomers were measured at different concentrations and temperatures. The surface and interfacial tension results confirmed the surface activity of the synthesized oligomers. The synthesized oligomers were investigated as Pour Point Depressants (PPDs) for crude oils (ASL-24 and Bakr-35) from Egyptian petroleum field. The oligomers under investigation showed high efficiency as PPDs. The maximum pour point reduction was obtained when the crude oil was treated by the 2000 ppm of C12P for ASL-24 and 2000 ppm of C10P for Bakr-35 crude oil. While the minimum pour point reduction was obtained with the 2000 ppm of C16P for ASL-24 and 500 ppm of C12P for Bakr-35 crude oil.