Rheological properties of C9 petroleum resin solutions

This paper investigates the rheological properties of C9 petroleum resin solutions, synthesized through different oligomerization methods. The research focuses on the behavior of resin solutions in terms of dynamic viscosity, shear stress, and shear rate with temperature, specifically between 293 and 343 K. The study shows that the viscosity of these solutions decreases with increasing temperature, which is typical of pseudoplastic, non-Newtonian fluids. The temperature coefficient for the resins ranges from –0.009 to –0.021 mPas/K, indicating that higher temperatures lead to a significant reduction in viscosity. The study examines the relationship between temperature and the density per unit viscosity, which increases in the observed temperature range. The density per unit viscosity at 293 K ranges from 507.0 to 1012.1 kg/m3, and at 343 K, it ranges from 1083.7 to 2085.5 kg/m3. These variations reflect differences in molecular structures and their influence on flow behavior under various temperature conditions. The flow index (n) ranges from –0.187 to –0.078, underscoring the strong pseudoplastic behavior of the resin solutions. The consistency constant, a measure of the material's resistance to flow, ranges from 2.1 to 5.55 Pasn. These findings show that the viscosity of the solutions decreases with increasing shear rate, further confirming the pseudoplastic nature of the resins. These rheological characteristics indicate that C9 resins are suitable for use in high-temperature environments and in applications requiring stable flowability, such as paint coatings.