Effect of temperature on rheological properties and interfacial tension of polyformaldehyde/polypropylene blends
Using a rotary rheometer to test the steady-state rheological properties of polyoxymethylene(POM)and polypropyl-ene(PP),the shear viscosity(η)and viscous flow activation energy(△Eη)of PP and POM were studied as a function of shear rate((·γ))and temperature at a temperature of 190-210℃ and (·γ) of 10-3-100 s-1.The change of interfacial tension with temperature for POM/PP blends was studied by DDR-IFR.The results showed that the η of PP and POM melts both showed a decreasing trend with the increase of (·γ),which conformed to the rheological law of pseudoplastic fluids among non-Newtonian flu-ids;the η of PP melt decreased profoundly with the increase of temperature at the same (·γ);the △Eη of PP and POM both decreased with the increase of (·γ) and showed a good linear relationship,and compared with POM,the △Eη of PP changed more significantly with (·γ);and the interfacial tension of POM/PP blends decreased with the increase of temperature in the range of 190-210℃ and exhibited a good linear relationship,with a linear correlation coefficient of-0.49 mN/(m·℃).
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维普
