Publications Scientifiques

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    Effect of concentration and temperature on the rheological behavior of hydroxylethyl cellulose solutions
    (2022) Remli, Samia; Benyounes, Khaled; Benmounah, Abdelbaki
    The knowledge of the rheological properties of polymers makes their use interesting in various fields of applications, such as food industry, cosmetics, enhanced oil recovery or construction materials. Whatever the application, the effect of temperature and concentration on these properties is of great importance. This study covered a wide range of concentrations from 0.2 w/% to 1 w/%, and temperatures from 10 °C to 80 °C. The results obtained provide interesting information regarding the effects of the temperature and concentration of the aqueous solutions of the polymer since they reveal that the rheological properties remained practically unchanged in the temperature range considered. The impacts of shear rate, temperature and concentration on the flow behavior were analyzed. Small-amplitude oscillatory shear measurements were performed, and the results obtained show that the apparent viscosity is strongly influenced by the concentration of the aqueous solution of HEC, exhibiting a marked non-Newtonian shear-thinning behavior at different temperatures. The flow behavior is well described by several rheological models. The effect of temperature on the kinematic viscosity was fitted with the Arrhenius model; the behavior of this model in relation to experimental viscosity values was suitable and the linear fit showed good regression coefficients. The dynamic state was well described with the generalized Maxwell model
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    Effects of poly-sal polymer and barite addition on rheological properties of algerian bentonite
    (EBSCOHOST, 2021) BacHir belmahdi, ilyes; Malek, Abderrahmane; Hammadi, Larbi
    In this paper, we investigate the effect of Poly-Sal polymer and barite on the rheological properties of bentonite of Maghnia (western Algeria). The modified Cross model is used to fit the stationary flow curves of bentonite at different concentrations of Poly-Sal add in base bentonite (4%) and the generalized model of Kelvin-Voigt is successfully applied to fit the creep and recovery data and to analyze the viscoelastic properties of the mixture Bentonite-Barite. Finally, the thixotropic behavior studied of the mixture Bentonite-Barite at constant temperature is analyzed by using a structural kinetic model (SKM) in order to account for the time dependent effect. It is demonstrated that the increase in quantity of barite in base bentonite induces a restructuring and reorganization of the particles of the bentonite at the microstructural level.
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    Relationship between the fractal structure with the shear complex modulus of montmorillonite suspensions
    (Elsevier, 2016) Gareche, Mourad; Allal, A.; Zeraibi, Noureddine; Roby, F.; Azril, N.; Saoudi, L.
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    Long-term bending creep behavior prediction of injection molded composite using stress–time correspondence principle
    (Elsevier, 2004) Hadid, M.; Rechak, S.; Tati, A.
    In analogous manner to the time–temperature superposition principle, the stress–time superposition principle approach is used to predict long-term material creep behavior without extensive laboratory test time. The bending creep of the injection fiber glass reinforced polyamide is studied. An improved empirical model is used to construct the creep master curve, to take into account the strong non-linear behavior. An excellent superposition of curves is obtained and, in a long-term, an important curvature in the master curve is registered