Precision rheometry: Surface tension effects on low-torque measurements in rotational rheometers J. Rheol. 57, 1515Rheol. 57, (2013 Rheological and morphological study of cocontinuous polymer blends during coarsening J. Rheol. 56, 1315Rheol. 56, (2012 Sphere motion in ordered three-dimensional foams J. Rheol. 56, 473 (2012) The work of adhesion of polymer/wall interfaces and its association with the onset of wall slip J. Rheol. 42, 795 (1998) Extensional rheometry of polymer multilayers: A sensitive probe of interfaces Synopsis When shear oscillations are performed with melts of polystyrene (PS)I poly(methylmethacrylate) (PMMA) blends the total deformation has a large elastic portion at low frequencies. This finding is caused by the interfacial tension acting between the two phases of the blends. A simple model allows one to describe the influence of the interfacial tension on the storage and the loss moduli in a broad frequency range for all mixing ratios of the blend components. The weighted relaxation spectra rH( r) of such blends show an additional peak with a characteristic relaxation time that is correlated with the interfacial tension. From this characteristic relaxation time the interfacial tension a between the melts of PS and PMMA can be determined, The resulting a = ( 1.9 ±O.3) X 10-3 N/m at 170'C is in good agreement with the value obtained from recovery following melt elongation of the blends.
Creep and creep recovery experiments in elongation were performed with melts of anionically polymerized polystyrenes (PS) and with their blends at a temperature of 150 °C. For stresses a0 < 10 000 N/m 2 the samples with narrow molecular weight distribution show linear viscoelastic behavior up to the maximum Hencky strain e = 3.5, achievable in a newly developed elongational rheometer for polymer melts. The compliances, D (t), of the blends are linear-viscoelastic only up to a strain limit eL. For strains beyond eL the compliance of each blend depends on the stress a0. For a series of binary blends, prepared from the same components of narrow MWD, the linear-viscoelastic limit eL seems to be independent of the mixing ratio and stress, eL seems to be a function only of the molecular weights of the original components, the blends investigated were made from.
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