Abstract
The shear viscosity η of a solution of polyvinylacetate (MW=6.7×104, Mw/Mn=2.2) in 3-heptanone was measured at the critical concentration 20.325g/100cm3 with varying temperature T in the vicinity of the critical solution temperature Tc(=284.52K). The measurements were made at various low shear rates by using a modified Ubbelohde viscometer with variable inclination angle. The critical anomaly in viscosity was observed. The temperature dependence of the anomalous component of viscosity Δη was expressed in the form, Δη/η=A ln[1-(Tc/T)]+B, with A=-0.034 at finite shear rates and A =-0.069 at zero shear rate. Both of these A values, if they are analysed by Oxtoby's and Kawasaki's theories, respectively, yield ν=0.64 for the critical exponent ν of the correlation length. This result is in good agreement with the result of light scattering measurements due to Kuwahara and indicates that the viscosity analysis is useful for the study of the critical behavior of polymer solutions.
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Schedule a callMore From: Nihon Reoroji Gakkaishi(Journal of the Society of Rheology, Japan)
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