Interfacial Tension of PBT/SAN Blends by the Drop Retraction Method
نویسندگان
چکیده
The aim of this work was to evaluate the interfacial tension from the poly(butylene terephtalate) and poly(styrene-co-acrylonitrile) (PBT/SAN) interface region using the drop retraction method. SAN filaments were sandwiched between two PBT films; the whole system was heated up to 240 °C, in a hot stage coupled to an optical microscope. The rheological parameters of the PBT/SAN system were obtained by parallel plates rheometry. An increase of the interfacial tension with the PBT molecular weight was observed with values between 0.57 and 1.06 mN/m, depending on the molecular weight. Theoretical values were calculated using the geometric-mean and harmonic-mean equations and were found to be similar to the experimental results. Viscosity measurements showed that the higher the SAN/PBT viscosity ratio, the lower the interfacial tension of these blends.
منابع مشابه
Diffuse-Interface Simulations of Drop Coalescence and Retraction in Complex Fluids
Drop dynamics plays a central role in defining the interfacial morphology in two-phase complex fluids such as emulsions and polymer blends. In such materials, the components are often microstructured complex fluids themselves. To model and simulate drop behavior in such systems, one has to deal with the dual complexity of non-Newtonian rheology and evolving interfaces. Recently, we developed a ...
متن کاملCFD evaluation of drop retraction methods for the measurement of interfacial tension of surfactant-laden drops.
Drop retraction methods are popular means of measuring the interfacial tension between immiscible polymers. Experiments show that two different drop retraction methods, imbedded fiber retraction (IFR) and deformed drop retraction (DDR), give inconsistent results when a surfactant is present on the surface of the drop. These inconsistencies are deemed to be due to dilution of the surfactant and ...
متن کاملInterfacial Tension Errors from the Cohen and Carriere Analysis of Imbedded Fiber Retraction
Immiscible polymers are often blended together to create new materials with desired properties. Knowledge of the interfacial tension between the immiscible polymers is important when designing such blending processes. Traditional methods of measuring the interfacial tension between low molecular weight fluids, e.g., the pendant or sessile drop method, the Wilhelmy balance, and the spinning drop...
متن کاملControlled jamming of particle-laden interfaces using a spinning drop tensiometer.
When particles adsorb at a fluid/fluid interface at a sufficiently high concentration, the interface loses mobility and displays solidlike characteristics, a phenomenon called "interfacial jamming". Jamming can arrest interfacial tension-driven morphological coarsening in liquid/liquid or gas/liquid systems and therefore stabilize two phase morphologies with unusual interfacial shapes, for exam...
متن کاملTransient interfacial tension and morphology evolution in partially miscible polymer blends.
The influence of molecular weight asymmetry across an interface on the transient behavior of the interfacial tension is investigated for two different polymer combinations, polybutadiene (PBD)/polydimethylsiloxane (PDMS) and polybutene (PB)/PDMS. This choice ensures a minor diffuse interface using the first combination and a very diffuse interface in the latter case. Measurements of the interfa...
متن کامل