الفهرس 
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Abstract
In this work, oil soluble terpolymers poly(diethylmaleate)-ter-(Hexadecylmethacrylate ester) (1-hexadecane) ((DEME-HDME-HD (TP1)), poly(diethylmaleate)-ter-(hexadecylmethacrylate ester) (1-octadecane) ((DEME-HDME-OD (TP2)), poly(diethylmaleate)-ter-(hexadecylmethacrylate amide) (1-hexadecane) (DEME-HDMA-HD (TP3)) and poly(diethylmaleate)-ter-(hexadecylmethacrylate Amide) (1-octadecane) (DEME-HDMA-OD (TP4)) were synthesized by using the monomers HDME, DEME, HDMA, HD and OD by solution polymerization and their nano-hybrids DEME-HDME-HD-NMMT (PNC1), DEME-HDME-OD-NMMT (PNC2), DEME-HDMA-HD-NMMT (PNC3) and DEME-HDMA-OD-NMMT (PNC4) were synthesized by emulsion polymerization in presence of NMMT. The chemical structures of the prepared terpolymers and their nano-hybrids were discussed by different techniques: FT-IR, 1HNMR, DLS, HR-TEM, EDX, POM and GPC. The thermal stability was also studied by TGA. The resultant polymers and their nanocomposites were investigated as pour point depressants (PPDs), viscosity index improver (VII) and rheological improvers for petroleum products (lube oil and diesel fuel). Some selected terpolymers and nano-hybrids were evaluated for tribological properties of the lube oil at room temperature and at 60 oC.
The results are encouraging and showing that, all polymeric additives exhibited a good efficiency as PPD, rheological properties and VII. The terpolymers nanocomposite additives have a good efficiency more than conventional terpolymers for all tested techniques. The data showed that, these additives can improve the properties of petroleum products and the lube oil can be used as engine lubricating oil.
Keywords: Terpolymers, nano-hybrid, NMMT, lubricating oil, diesel fuel, Pour point depressants, and rheological properties