The development of formulations that solve at least two problems simultaneously (called multifunction or combo formulations) is very useful. In this study, different formulations were prepared in an attempt to find one that could act at the same time to inhibit deposition of waxes and asphaltenes. Formulations were prepared containing EVA 33 and one of the additives for asphaltenes dispersion (dodecylbenzenesulfonic acid, cardanol and two commercial products called INH1 and INH2), at various concentrations. The results showed that none of the asphaltenes stabilizers exhibited any influence on the performance of EVA33. Nevertheless, the EVA33 affected slightly the performance of the asphaltenes stabilizers. The formulations containing cardanol and EVA 33 performed better at inhibiting deposition of both asphaltenes and waxes than the other formulations did.

Amphiphilic polymers have found many applications, so many types of these copolymers have been prepared. Specifically, sulfonated polystyrene acts, for example, as a flocullant or dispersant of petroleum asphaltenes as a function of its hydrophilic-hydrophobic balance. However, when changing the sulfonation degree, looking for the best performance, the solubility also changes, and sometimes it is responsible for making the polymer unsuitable for any application. Therefor, this work investigates in detail the changes in the solubility range of copolymers based on styrene-stearyl methacrylate and styrene-stearyl cinnamate with different molar compositions and different sulfonation degrees. The copolymers were synthesized and characterized by 1 H-NMR, Fourier transform infrared spectroscopy, and elemental analysis. In the range of compositions analyzed, with increasing content of long hydrocarbon chains, not only the displacement of the solubility in solvents with lower solubility parameter (d), but also the broadening of the solubility range was observed. In general, the solubility was directly related to the sulfonic group content, but there appeared to be an influence of the randomness of the sulfonation reactions along the chains. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43112.