Rheologica Acta
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Molecular orientation in sheared molten thermotropic random copolyester
Rheologica Acta - Tập 46 - Trang 1139-1152 - 2007
The macromolecular alignment and texture orientation in sheared thermotropic
copolyester were investigated using in situ wide-angle X-ray scattering (WAXS)
and polarizing optical microscopy (POM). The molecular behavior was correlated
with viscoelastic properties. The polymer is a random copolyester based on
60 mol% 1,4-hydroxybenzoic acid (B) and 40 mol% ethylene terephthalate (ET)
units. X-ray s...
Frequency dispersion of strain-induced crystallization coefficient of natural rubber vulcanizates in sub-sonic range
Rheologica Acta - - 1974
Predicting the rheology of linear with branched polyethylene blends
Rheologica Acta - Tập 35 Số 5 - Trang 481-491 - 1996
Die Viskosität niedermolekularer, unpolarer Flüssigkeiten in Abhängigkeit von Temperatur, Druck und Konzentration
Rheologica Acta - Tập 2 - Trang 164-174 - 1962
Flüssigkeiten mit unpolaren oder schwachpolaren Molekülen folgen gewöhnlich
gleichzeitig der Gleichung vonTammann für die Temperaturabhängigkeit und der
Gleichung vonArrhenius für die Konzentrationsabhängigkeit ihrer Viskosität.
Hieraus ergibt sich eine bestimmte Konzentrationsabhängigkeit der Konstanten der
Temperaturgleichung und damit auch eine Beziehung für die Viskositätszahl als
Funktion der...
A note on streaming double refraction in a dilute suspension of rigid spheroids subject to weak Brownian rotations
Rheologica Acta - Tập 11 Số 2 - Trang 190-198 - 1972
The phenomenon of streaming double refraction is examined theoretically for
simple shear flow of a dilute suspension of rigid spheroids which are subject to
weak Brownian rotations. In particular, we employ recently derived expressions
for the statistical distribution of particle orientations in the limit of weak
rotaryBrown-ian motion to calculate the corresponding limiting behavior of the
extinc...
Age dependence of the drag force in an aqueous foam
Rheologica Acta - Tập 45 - Trang 803-811 - 2006
The drag force on a sphere moving through an aqueous foam is measured as the
foam ages. After an initial period, the steady-state drag decreases with age T
as T −0.54±0.14. As the mean bubble size R in the foam coarsens as T 0.5, this
implies that the drag force scales as % MathType!Translator!2!1!AMS
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Rheological properties of thin gelatin films
Rheologica Acta - Tập 10 Số 1 - Trang 158-164 - 1971
The stability of oil-in-water emulsions depends ultimately on the physical
nature of the oil-water interface. If a hydrocolloid or protein is used as an
emulsifying agent an interfacial film is formed at the oil-water interface and
this may be liquid or viscoelastic solid in properties. The film is formed by
the two processes of diffusion from the bulk to the interface and the formation
of seconda...
Rheology of concentrated disperse systems III. General features of the proposed non-newtonian model. Comparison with experimental data
Rheologica Acta - Tập 17 - Trang 643-653 - 1978
A non-newtonian viscosity equation $$\eta _r = (1 - \tfrac{1}{2} \cdot \tilde
k\phi )^{ - 2} $$ whereφ is the volume concentration and $$\tilde k = (k_0 +
k_\infty \dot \gamma _r^p )/(1 + \dot \gamma _r^p )$$ is an intrinsic viscosity,
function of a relative shear rate $$\dot \gamma _r = \dot \gamma /\dot \gamma _c
, k_0 , k_\infty $$ and $$\dot \gamma _c $$ being structural parameters, has
been p...
Numerical simulation of flow kinematics for suspensions containing continuously dispersed aspect ratio fibers
Rheologica Acta - Tập 45 - Trang 547-554 - 2005
Fiber suspension flow and fiber orientation through a parallel-plate channel
were numerically simulated for fiber suspensions including continuously
dispersed aspect ratios from 10 to 50. In the simulations, both the fiber–fiber
and fiber–wall interactions were not taken into account. A statistical scheme
that proceeds by evaluating the orientation evolution of a large number of
fibers from the so...
Avoiding waviness of relaxation spectra
Rheologica Acta - Tập 48 - Trang 709-713 - 2009
Spectra are material functions, whose different integral transforms yield the
measurable rheological quantities in the linear viscoelastic regime. Therefore,
their knowledge is of high fundamental interest. However, the calculation of
spectra from experimental data is an ill-posed problem. Thus, it is hampered by
the problem that a too low density of relaxation modes does not lead to a good
descri...
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